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HOW TO CATCH AND HANDLE ERRORS IN BASH We need set +e, so that the non-zero returned by throw () will not terminate a bash script. Inside catch (), we store the value of exception raised by throw () in a bash variable exception_code, so that we can handle the exception in a user-defined fashion. Perhaps an example bash script will make it clear how trycatch.sh works. HOW TO READ COMMAND LINE ARGUMENTS IN A BASH SCRIPT Method Two: Read Command-Line Argument with for Loop. Another way to check command-line arguments in a bash script is by referencing a special bash parameter called $@, which expands to a list of supplied command-line arguments. Since $@ is an iterable list, you can use for loop to read each argument in the list. HOW TO INSTALL AND RUN ANDROID VM ON VMWARE PLAYER Power on the VM. Once VM boots up, you will see the following screen. Choose Install Android-x86 to harddisk. Next you will see Choose Partition window. Click on Create/Modify partitions menu. This will lead you to a disk partition editor menu. Use HOW TO ACCESS VNC REMOTE DESKTOP IN WEB BROWSER To launch Websockify, use a startup script called launch.sh. This script starts a mini-webserver as well as Websockify. The --vnc option is used to specify the location of a remotely running VNC server. $ cd noVNC $ ./utils/launch.sh --vnc 192.168.1.10:5900. HOW TO CREATE AND MOUNT AN XFS FILE SYSTEM ON LINUX XFS is a high-performance file system which was designed by SGI for their IRIX platform. Since XFS was ported to the Linux kernel in 2001, XFS has remained a preferred choice for many enterprise systems especially with massive amount of data, due to its high performance, architectural scalability and robustness.For example, RHEL/CentOS 7 and Oracle Linux have adopted XFS as their HOW TO USE A KEY-VALUE DICTIONARY IN BASH How to use a key-value dictionary in bash. Last updated on February 22, 2021 by Dan Nanni. In any programming language, a dictionary is one of the most fundamental data structures that can store a HOW TO DOWNLOAD MULTIPLE FILES WITH WGET While you could invoke wget multiple times manually, there are several ways to download multiple files with wget in one shot. If you know a list of URLs to fetch, you can simply supply wget with an input file that contains a list of URLs. Use -i option is for that purpose. $ wget -i url_list.txt. If URL names have a specific numbering pattern HOW TO SPECIFY A PRIVATE KEY FILE IN SSH How to specify a private key file in SSH. Last updated on August 22, 2020 by Dan Nanni. If you connect to a remote server via SSH, which only accepts key authentication, you need to present your private key to the SSH server for authentication.It is straightforward to do HOW TO ENABLE POWERTOOLS ON CENTOS 8 Enable PowerTools with DNF config-manager. CentOS/RHEL 8 comes with PowerTools repository already added. Thus, you simply need to enable it as follows. $ sudo dnf config-manager --set-enabled powertools. Verify that PowerTools is successfully enabled: $ dnf repolist. HOW TO LIVE STREAM VIDEO FROM WEBCAM ON LINUX Click on Stream button at the bottom. Verify the video source (e.g., v4l2:///dev/video ), and click on Next button to go next. On this screen, choose the destination (i.e., streaming method/target) of webcam streaming. Since we use HTTP streaming, choose HTTP from the drop down list, and click on Add button. Next, specify port number andpath
HOW TO CATCH AND HANDLE ERRORS IN BASH We need set +e, so that the non-zero returned by throw () will not terminate a bash script. Inside catch (), we store the value of exception raised by throw () in a bash variable exception_code, so that we can handle the exception in a user-defined fashion. Perhaps an example bash script will make it clear how trycatch.sh works. HOW TO READ COMMAND LINE ARGUMENTS IN A BASH SCRIPT Method Two: Read Command-Line Argument with for Loop. Another way to check command-line arguments in a bash script is by referencing a special bash parameter called $@, which expands to a list of supplied command-line arguments. Since $@ is an iterable list, you can use for loop to read each argument in the list. HOW TO ACCESS VNC REMOTE DESKTOP IN WEB BROWSER To launch Websockify, use a startup script called launch.sh. This script starts a mini-webserver as well as Websockify. The --vnc option is used to specify the location of a remotely running VNC server. $ cd noVNC $ ./utils/launch.sh --vnc 192.168.1.10:5900. HOW TO USE MAP, REDUCE AND FILTER IN PYTHON Reduce Function. While both the filter () and map () functions return an iterator, reduce () is a bit different, and it outputs a single value. Simply put, it reduces or folds all values of an iterable to a single value. reduce () takes a two-argument function and an iterable. HOW TO LIVE STREAM VIDEO FROM WEBCAM ON LINUX Click on Stream button at the bottom. Verify the video source (e.g., v4l2:///dev/video ), and click on Next button to go next. On this screen, choose the destination (i.e., streaming method/target) of webcam streaming. Since we use HTTP streaming, choose HTTP from the drop down list, and click on Add button. Next, specify port number andpath
HOW TO INSTALL A USB WEBCAM IN RASPBERRY PI If you want to take pictures or record videos using Raspberry Pi board, you can install Raspberry Pi camera board.If you do not want to shell out money just for the camera board module, there is yet another way, which is to utilize a commonly found USB web camera. HOW TO EMBED PYTHON CODE IN C PROGRAM Step 2: Initialize Interpreter and Set Path. The first step towards embedding Python in C is to initialize Python interpreter, which can be done with the following C function. Py_Initialize (); After the interpreter is initialized, you need to set the path to the Python module you would like to HOW TO CHECK WHAT LIBRARIES ARE USED BY A PROGRAM OR Check Shared Library Dependencies of a Running Process. If you want to find out what shared libraries are loaded by a running process, you can use pldd command, which shows all shared objects loaded into a process at run-time. $ sudo pldd . Note that you need root privilege to run pldd command. Alternatively, a command line utility called HOW TO MEASURE ELAPSED TIME IN BASH Elapsed time is the amount of wall-clock time that has passed between the beginning and the end of a particular event. This tutorial describes how to measure elapsed time with various resolutions inbash.
HOW TO RUN FDISK IN NON-INTERACTIVE BATCH MODE How to run fdisk in non-interactive batch mode. Last updated on September 30, 2020 by Dan Nanni. fdisk is a command-line utility for disk partition management. It's not common that you want to automate fdisk (i.e., running fdisk in a batch mode), since (re)-partitioning your system is a rare thing, and you typically deal with a small number of partitions at once. HOW TO CATCH AND HANDLE ERRORS IN BASH We need set +e, so that the non-zero returned by throw () will not terminate a bash script. Inside catch (), we store the value of exception raised by throw () in a bash variable exception_code, so that we can handle the exception in a user-defined fashion. Perhaps an example bash script will make it clear how trycatch.sh works. HOW TO READ COMMAND LINE ARGUMENTS IN A BASH SCRIPT Method Two: Read Command-Line Argument with for Loop. Another way to check command-line arguments in a bash script is by referencing a special bash parameter called $@, which expands to a list of supplied command-line arguments. Since $@ is an iterable list, you can use for loop to read each argument in the list. HOW TO INSTALL AND RUN ANDROID VM ON VMWARE PLAYER Power on the VM. Once VM boots up, you will see the following screen. Choose Install Android-x86 to harddisk. Next you will see Choose Partition window. Click on Create/Modify partitions menu. This will lead you to a disk partition editor menu. Use HOW TO ACCESS VNC REMOTE DESKTOP IN WEB BROWSER To launch Websockify, use a startup script called launch.sh. This script starts a mini-webserver as well as Websockify. The --vnc option is used to specify the location of a remotely running VNC server. $ cd noVNC $ ./utils/launch.sh --vnc 192.168.1.10:5900. HOW TO DOWNLOAD MULTIPLE FILES WITH WGET While you could invoke wget multiple times manually, there are several ways to download multiple files with wget in one shot. If you know a list of URLs to fetch, you can simply supply wget with an input file that contains a list of URLs. Use -i option is for that purpose. $ wget -i url_list.txt. If URL names have a specific numbering pattern HOW TO CREATE AND MOUNT AN XFS FILE SYSTEM ON LINUX XFS is a high-performance file system which was designed by SGI for their IRIX platform. Since XFS was ported to the Linux kernel in 2001, XFS has remained a preferred choice for many enterprise systems especially with massive amount of data, due to its high performance, architectural scalability and robustness.For example, RHEL/CentOS 7 and Oracle Linux have adopted XFS as their HOW TO USE A KEY-VALUE DICTIONARY IN BASH How to use a key-value dictionary in bash. Last updated on February 22, 2021 by Dan Nanni. In any programming language, a dictionary is one of the most fundamental data structures that can store a HOW TO SPECIFY A PRIVATE KEY FILE IN SSH How to specify a private key file in SSH. Last updated on August 22, 2020 by Dan Nanni. If you connect to a remote server via SSH, which only accepts key authentication, you need to present your private key to the SSH server for authentication.It is straightforward to do HOW TO EMBED PYTHON CODE IN C PROGRAM Step 2: Initialize Interpreter and Set Path. The first step towards embedding Python in C is to initialize Python interpreter, which can be done with the following C function. Py_Initialize (); After the interpreter is initialized, you need to set the path to the Python module you would like to HOW TO ENABLE POWERTOOLS ON CENTOS 8 Enable PowerTools with DNF config-manager. CentOS/RHEL 8 comes with PowerTools repository already added. Thus, you simply need to enable it as follows. $ sudo dnf config-manager --set-enabled powertools. Verify that PowerTools is successfully enabled: $ dnf repolist. HOW TO LIVE STREAM VIDEO FROM WEBCAM ON LINUX Click on Stream button at the bottom. Verify the video source (e.g., v4l2:///dev/video ), and click on Next button to go next. On this screen, choose the destination (i.e., streaming method/target) of webcam streaming. Since we use HTTP streaming, choose HTTP from the drop down list, and click on Add button. Next, specify port number andpath
HOW TO READ COMMAND LINE ARGUMENTS IN A BASH SCRIPT Method Two: Read Command-Line Argument with for Loop. Another way to check command-line arguments in a bash script is by referencing a special bash parameter called $@, which expands to a list of supplied command-line arguments. Since $@ is an iterable list, you can use for loop to read each argument in the list. HOW TO INSTALL AND RUN ANDROID VM ON VMWARE PLAYER Power on the VM. Once VM boots up, you will see the following screen. Choose Install Android-x86 to harddisk. Next you will see Choose Partition window. Click on Create/Modify partitions menu. This will lead you to a disk partition editor menu. Use HOW TO ACCESS VNC REMOTE DESKTOP IN WEB BROWSER To launch Websockify, use a startup script called launch.sh. This script starts a mini-webserver as well as Websockify. The --vnc option is used to specify the location of a remotely running VNC server. $ cd noVNC $ ./utils/launch.sh --vnc 192.168.1.10:5900. HOW TO DOWNLOAD MULTIPLE FILES WITH WGET While you could invoke wget multiple times manually, there are several ways to download multiple files with wget in one shot. If you know a list of URLs to fetch, you can simply supply wget with an input file that contains a list of URLs. Use -i option is for that purpose. $ wget -i url_list.txt. If URL names have a specific numbering pattern HOW TO CREATE AND MOUNT AN XFS FILE SYSTEM ON LINUX XFS is a high-performance file system which was designed by SGI for their IRIX platform. Since XFS was ported to the Linux kernel in 2001, XFS has remained a preferred choice for many enterprise systems especially with massive amount of data, due to its high performance, architectural scalability and robustness.For example, RHEL/CentOS 7 and Oracle Linux have adopted XFS as their HOW TO USE A KEY-VALUE DICTIONARY IN BASH How to use a key-value dictionary in bash. Last updated on February 22, 2021 by Dan Nanni. In any programming language, a dictionary is one of the most fundamental data structures that can store a HOW TO SPECIFY A PRIVATE KEY FILE IN SSH How to specify a private key file in SSH. Last updated on August 22, 2020 by Dan Nanni. If you connect to a remote server via SSH, which only accepts key authentication, you need to present your private key to the SSH server for authentication.It is straightforward to do HOW TO EMBED PYTHON CODE IN C PROGRAM Step 2: Initialize Interpreter and Set Path. The first step towards embedding Python in C is to initialize Python interpreter, which can be done with the following C function. Py_Initialize (); After the interpreter is initialized, you need to set the path to the Python module you would like to HOW TO ENABLE POWERTOOLS ON CENTOS 8 Enable PowerTools with DNF config-manager. CentOS/RHEL 8 comes with PowerTools repository already added. Thus, you simply need to enable it as follows. $ sudo dnf config-manager --set-enabled powertools. Verify that PowerTools is successfully enabled: $ dnf repolist. HOW TO LIVE STREAM VIDEO FROM WEBCAM ON LINUX Click on Stream button at the bottom. Verify the video source (e.g., v4l2:///dev/video ), and click on Next button to go next. On this screen, choose the destination (i.e., streaming method/target) of webcam streaming. Since we use HTTP streaming, choose HTTP from the drop down list, and click on Add button. Next, specify port number andpath
HOW TO READ COMMAND LINE ARGUMENTS IN A BASH SCRIPT Method Two: Read Command-Line Argument with for Loop. Another way to check command-line arguments in a bash script is by referencing a special bash parameter called $@, which expands to a list of supplied command-line arguments. Since $@ is an iterable list, you can use for loop to read each argument in the list. HOW TO ACCESS VNC REMOTE DESKTOP IN WEB BROWSER To launch Websockify, use a startup script called launch.sh. This script starts a mini-webserver as well as Websockify. The --vnc option is used to specify the location of a remotely running VNC server. $ cd noVNC $ ./utils/launch.sh --vnc 192.168.1.10:5900. HOW TO USE INDEXED ARRAYS IN BASH Declare an Indexed Array in Bash. While a given bash variable can be implicitly declared as an array by applying an array operation to it, you can explicitly declare a variable as an indexed array by using the built-in declare command with -a option. Note that -A option is used for associated arrays. HOW TO CATCH AND HANDLE ERRORS IN BASH We need set +e, so that the non-zero returned by throw () will not terminate a bash script. Inside catch (), we store the value of exception raised by throw () in a bash variable exception_code, so that we can handle the exception in a user-defined fashion. Perhaps an example bash script will make it clear how trycatch.sh works. HOW TO LIVE STREAM VIDEO FROM WEBCAM ON LINUX Click on Stream button at the bottom. Verify the video source (e.g., v4l2:///dev/video ), and click on Next button to go next. On this screen, choose the destination (i.e., streaming method/target) of webcam streaming. Since we use HTTP streaming, choose HTTP from the drop down list, and click on Add button. Next, specify port number andpath
HOW TO EMBED PYTHON CODE IN C PROGRAM Step 2: Initialize Interpreter and Set Path. The first step towards embedding Python in C is to initialize Python interpreter, which can be done with the following C function. Py_Initialize (); After the interpreter is initialized, you need to set the path to the Python module you would like to HOW TO INSTALL A USB WEBCAM IN RASPBERRY PI If you want to take pictures or record videos using Raspberry Pi board, you can install Raspberry Pi camera board.If you do not want to shell out money just for the camera board module, there is yet another way, which is to utilize a commonly found USB web camera. HOW TO CHECK WHAT LIBRARIES ARE USED BY A PROGRAM OR Check Shared Library Dependencies of a Running Process. If you want to find out what shared libraries are loaded by a running process, you can use pldd command, which shows all shared objects loaded into a process at run-time. $ sudo pldd . Note that you need root privilege to run pldd command. Alternatively, a command line utility called HOW TO CHECK GLIBC VERSION ON LINUX A simple command-line to check the version of the GNU C library is as follows. $ ldd --version. In this example, the version of glibc is2.19.
HOW TO RUN FDISK IN NON-INTERACTIVE BATCH MODE How to run fdisk in non-interactive batch mode. Last updated on September 30, 2020 by Dan Nanni. fdisk is a command-line utility for disk partition management. It's not common that you want to automate fdisk (i.e., running fdisk in a batch mode), since (re)-partitioning your system is a rare thing, and you typically deal with a small number of partitions at once. HOW TO READ COMMAND LINE ARGUMENTS IN A BASH SCRIPT Method Two: Read Command-Line Argument with for Loop. Another way to check command-line arguments in a bash script is by referencing a special bash parameter called $@, which expands to a list of supplied command-line arguments. Since $@ is an iterable list, you can use for loop to read each argument in the list. HOW TO DOWNLOAD MULTIPLE FILES WITH WGET While you could invoke wget multiple times manually, there are several ways to download multiple files with wget in one shot. If you know a list of URLs to fetch, you can simply supply wget with an input file that contains a list of URLs. Use -i option is for that purpose. $ wget -i url_list.txt. If URL names have a specific numbering pattern HOW TO CONFIGURE FAIL2BAN TO PROTECT APACHE HTTP SERVER How to configure fail2ban to protect Apache HTTP server. Last updated on September 25, 2020 by Dan Nanni. Apache web server in production environments can be under attack in various different ways. Attackers may attempt to gain access to unauthorized or forbidden directories by using brute-force attacks or executing evil scripts. HOW TO SPECIFY A PRIVATE KEY FILE IN SSHSSH USING PRIVATE KEY FILESSH SPECIFY KEY FILEOPENSSH PRIVATE KEY FILESSH PRIVATE KEY FILESSH PRIVATE KEY FILE PERMISSIONSGIT SPECIFY SSH KEY FILE How to specify a private key file in SSH. Last updated on August 22, 2020 by Dan Nanni. If you connect to a remote server via SSH, which only accepts key authentication, you need to present your private key to the SSH server for authentication.It is straightforward to do HOW TO USE A KEY-VALUE DICTIONARY IN BASH How to use a key-value dictionary in bash. Last updated on February 22, 2021 by Dan Nanni. In any programming language, a dictionary is one of the most fundamental data structures that can store a HOW TO CREATE MULTIPLE NETWORKS ON VMWARE PLAYER How to create multiple networks on VMware Player. Last updated on October 18, 2020 by Dan Nanni. If you have installed VMware Player on Linux, you will notice that VMware Player GUI offers three network options for guest VMs, as shown below: (1) bridged network, (2) NAT network, and (3) host-only network. What if you want to connect your guest VM to multiple isolated virtual networks, each of HOW TO VIEW THREADS OF A PROCESS ON LINUXTOP THREAD SHOWS ON BOTTOMTOP THREAD SHOWS ON BOTTOM To enable thread views in the top output, invoke top with -H option. This will list all Linux threads. You can also toggle on or off thread view mode while top is running, by pressing key. $ top -H. To restrict the top output to a particular process and check all threads running inside the process: $ top -H -p . HOW TO ACCESS A NAT GUEST FROM HOST WITH VIRTUALBOX On VirtualBox, choose the guest VM you want to access, and open Settings window of the VM. Click on Network menu on the left, click on Advanced to show additional network adapter options. Click on a button labeled Port Forwarding. You will see a window where you can configure port forwarding rules. Click on Add icon in the upper right corner. HOW TO BLOCK SPECIFIC USER AGENTS ON NGINX WEB SERVER The | operator is logical-OR, so you can put as many user-agent keywords in the if statements, and block them all. After modifying the configuration file, you must reload nginx to activate the blocking: $ sudo /path/to/nginx -s reload. You can test user-agent blocking by using wget or curl with --user-agent option. HOW TO CHECK GLIBC VERSION ON LINUX A simple command-line to check the version of the GNU C library is as follows. $ ldd --version. In this example, the version of glibc is2.19.
HOW TO OPEN A PORT IN THE FIREWALL ON CENTOS OR RHEL Use iptables command to open up a new TCP/UDP port in the firewall. To save the updated rule permanently, you need the second command. $ sudo iptables -I INPUT -p tcp -m tcp --dport 80 -j ACCEPT $ sudo service iptables save. Another way to open up a port on CentOS/RHEL 6 is to use a terminal-user interface (TUI) firewall client, named system HOW TO DOWNLOAD MULTIPLE FILES WITH WGET While you could invoke wget multiple times manually, there are several ways to download multiple files with wget in one shot. If you know a list of URLs to fetch, you can simply supply wget with an input file that contains a list of URLs. Use -i option is for that purpose. $ wget -i url_list.txt. If URL names have a specific numbering pattern HOW TO CONFIGURE FAIL2BAN TO PROTECT APACHE HTTP SERVER How to configure fail2ban to protect Apache HTTP server. Last updated on September 25, 2020 by Dan Nanni. Apache web server in production environments can be under attack in various different ways. Attackers may attempt to gain access to unauthorized or forbidden directories by using brute-force attacks or executing evil scripts. HOW TO SPECIFY A PRIVATE KEY FILE IN SSHSSH USING PRIVATE KEY FILESSH SPECIFY KEY FILEOPENSSH PRIVATE KEY FILESSH PRIVATE KEY FILESSH PRIVATE KEY FILE PERMISSIONSGIT SPECIFY SSH KEY FILE How to specify a private key file in SSH. Last updated on August 22, 2020 by Dan Nanni. If you connect to a remote server via SSH, which only accepts key authentication, you need to present your private key to the SSH server for authentication.It is straightforward to do HOW TO USE A KEY-VALUE DICTIONARY IN BASH How to use a key-value dictionary in bash. Last updated on February 22, 2021 by Dan Nanni. In any programming language, a dictionary is one of the most fundamental data structures that can store a HOW TO CREATE MULTIPLE NETWORKS ON VMWARE PLAYER How to create multiple networks on VMware Player. Last updated on October 18, 2020 by Dan Nanni. If you have installed VMware Player on Linux, you will notice that VMware Player GUI offers three network options for guest VMs, as shown below: (1) bridged network, (2) NAT network, and (3) host-only network. What if you want to connect your guest VM to multiple isolated virtual networks, each of HOW TO VIEW THREADS OF A PROCESS ON LINUXTOP THREAD SHOWS ON BOTTOMTOP THREAD SHOWS ON BOTTOM To enable thread views in the top output, invoke top with -H option. This will list all Linux threads. You can also toggle on or off thread view mode while top is running, by pressing key. $ top -H. To restrict the top output to a particular process and check all threads running inside the process: $ top -H -p . HOW TO ACCESS A NAT GUEST FROM HOST WITH VIRTUALBOX On VirtualBox, choose the guest VM you want to access, and open Settings window of the VM. Click on Network menu on the left, click on Advanced to show additional network adapter options. Click on a button labeled Port Forwarding. You will see a window where you can configure port forwarding rules. Click on Add icon in the upper right corner. HOW TO BLOCK SPECIFIC USER AGENTS ON NGINX WEB SERVER The | operator is logical-OR, so you can put as many user-agent keywords in the if statements, and block them all. After modifying the configuration file, you must reload nginx to activate the blocking: $ sudo /path/to/nginx -s reload. You can test user-agent blocking by using wget or curl with --user-agent option. HOW TO CHECK GLIBC VERSION ON LINUX A simple command-line to check the version of the GNU C library is as follows. $ ldd --version. In this example, the version of glibc is2.19.
HOW TO OPEN A PORT IN THE FIREWALL ON CENTOS OR RHEL Use iptables command to open up a new TCP/UDP port in the firewall. To save the updated rule permanently, you need the second command. $ sudo iptables -I INPUT -p tcp -m tcp --dport 80 -j ACCEPT $ sudo service iptables save. Another way to open up a port on CentOS/RHEL 6 is to use a terminal-user interface (TUI) firewall client, named system HOW TO SET UP SERVER MONITORING SYSTEM WITH MONIT How to set up server monitoring system with Monit. Last updated on August 24, 2020 by Dan Nanni. Many Linux admins rely on a centralized remote monitoring system (e.g., Nagios or Cacti) to check the health of their network infrastructure.While centralized monitoring makes an admin's life easy when dealing with many hosts and devices, a dedicated monitoring box obviously becomes a single HOW TO ENABLE SOFTWARE COLLECTIONS (SCL) ON CENTOS How to enable Software Collections (SCL) on CentOS. Last updated on September 23, 2020 by Dan Nanni. Red Hat Enterprise Linux (RHEL) and its community fork, CentOS, offer 10-year life cycle, meaning that each version of RHEL/CentOS is updated with security patches for up to10 years.
HOW TO SET UP A SECURE FTP SERVICE WITH VSFTPD ON LINUX How to set up a secure FTP service with vsftpd on Linux. Last updated on November 30, 2020 by Dan Nanni. FTP or File Transfer Protocol is one of the widely used services on the Internet, mainly for transferring files from one host to other. HOW TO VIEW THREADS OF A PROCESS ON LINUX Threads are a popular programming abstraction for parallel execution on modern operating systems. When threads are forked inside a program for multiple flows of execution, these threads share certain resources (e.g., memory address space, open files) among themselves to minimize forking overhead and avoid expensive IPC (inter-process communication)channel.
HOW TO ACCESS VNC REMOTE DESKTOP IN WEB BROWSER To launch Websockify, use a startup script called launch.sh. This script starts a mini-webserver as well as Websockify. The --vnc option is used to specify the location of a remotely running VNC server. $ cd noVNC $ ./utils/launch.sh --vnc 192.168.1.10:5900. HOW TO DOWNLOAD YOUTUBE PLAYLIST IN LINUX Support Xmodulo. This website is made possible by minimal ads and your gracious donation via PayPal (Credit Card) or Bitcoin (1M161JGAkz3oaHNvTiPFjNYkeABox8rb4g HOW TO ACCESS A NAT GUEST FROM HOST WITH VIRTUALBOX VirtualBox supports several networking options for guest VMs, one of them being NAT networking. When NAT networking is enabled for a guest VM, VirtualBox automatically performs network address translation between the guest VM and host's network stack, so that you do not have to configure anything on the host machine and local network for the guest VM's networking to work. HOW TO OPEN A PORT IN THE FIREWALL ON CENTOS OR RHEL Use iptables command to open up a new TCP/UDP port in the firewall. To save the updated rule permanently, you need the second command. $ sudo iptables -I INPUT -p tcp -m tcp --dport 80 -j ACCEPT $ sudo service iptables save. Another way to open up a port on CentOS/RHEL 6 is to use a terminal-user interface (TUI) firewall client, named system HOW TO INSTALL AND CONFIGURE TINC VPN ON LINUX How to install and configure tinc VPN on Linux. Last updated on September 28, 2020 by Dan Nanni. tinc is an open-source VPN software with a number of powerful features not found in other VPN solutions. For example, tinc VPN allows peers behind NAT to communicate with one another via VPN directly, not through a third party server.This makes tinc a type of peer-to-peer VPN solution. HOW TO ENABLE SR-IOV VIRTUAL FUNCTION ON INTEL IXGBE NIC SR-IOV is a technology which allows a single PCIe (PCI Express) device to emulate multiple separate PCIe devices. The emulated PCIe functions are called "virtual functions" (VFs), while the original PCIe device functions are called "physical functions" (PFs).SR-IOV is typically used in I/O virtualization environment, where a single PCIe device needs to be shared among multiple virtual machines. HOW TO DOWNLOAD MULTIPLE FILES WITH WGET While you could invoke wget multiple times manually, there are several ways to download multiple files with wget in one shot. If you know a list of URLs to fetch, you can simply supply wget with an input file that contains a list of URLs. Use -i option is for that purpose. $ wget -i url_list.txt. If URL names have a specific numbering pattern HOW TO CONFIGURE FAIL2BAN TO PROTECT APACHE HTTP SERVER How to configure fail2ban to protect Apache HTTP server. Last updated on September 25, 2020 by Dan Nanni. Apache web server in production environments can be under attack in various different ways. Attackers may attempt to gain access to unauthorized or forbidden directories by using brute-force attacks or executing evil scripts. HOW TO SPECIFY A PRIVATE KEY FILE IN SSHSSH USING PRIVATE KEY FILESSH SPECIFY KEY FILEOPENSSH PRIVATE KEY FILESSH PRIVATE KEY FILESSH PRIVATE KEY FILE PERMISSIONSGIT SPECIFY SSH KEY FILE How to specify a private key file in SSH. Last updated on August 22, 2020 by Dan Nanni. If you connect to a remote server via SSH, which only accepts key authentication, you need to present your private key to the SSH server for authentication.It is straightforward to do HOW TO USE A KEY-VALUE DICTIONARY IN BASH How to use a key-value dictionary in bash. Last updated on February 22, 2021 by Dan Nanni. In any programming language, a dictionary is one of the most fundamental data structures that can store a HOW TO CREATE MULTIPLE NETWORKS ON VMWARE PLAYER How to create multiple networks on VMware Player. Last updated on October 18, 2020 by Dan Nanni. If you have installed VMware Player on Linux, you will notice that VMware Player GUI offers three network options for guest VMs, as shown below: (1) bridged network, (2) NAT network, and (3) host-only network. What if you want to connect your guest VM to multiple isolated virtual networks, each of HOW TO ENABLE SOFTWARE COLLECTIONS (SCL) ON CENTOS How to enable Software Collections (SCL) on CentOS. Last updated on September 23, 2020 by Dan Nanni. Red Hat Enterprise Linux (RHEL) and its community fork, CentOS, offer 10-year life cycle, meaning that each version of RHEL/CentOS is updated with security patches for up to10 years.
HOW TO ACCESS A NAT GUEST FROM HOST WITH VIRTUALBOX On VirtualBox, choose the guest VM you want to access, and open Settings window of the VM. Click on Network menu on the left, click on Advanced to show additional network adapter options. Click on a button labeled Port Forwarding. You will see a window where you can configure port forwarding rules. Click on Add icon in the upper right corner. HOW TO VIEW THREADS OF A PROCESS ON LINUXTOP THREAD SHOWS ON BOTTOMTOP THREAD SHOWS ON BOTTOM To enable thread views in the top output, invoke top with -H option. This will list all Linux threads. You can also toggle on or off thread view mode while top is running, by pressing key. $ top -H. To restrict the top output to a particular process and check all threads running inside the process: $ top -H -p . HOW TO CHECK GLIBC VERSION ON LINUX A simple command-line to check the version of the GNU C library is as follows. $ ldd --version. In this example, the version of glibc is2.19.
HOW TO OPEN A PORT IN THE FIREWALL ON CENTOS OR RHEL Use iptables command to open up a new TCP/UDP port in the firewall. To save the updated rule permanently, you need the second command. $ sudo iptables -I INPUT -p tcp -m tcp --dport 80 -j ACCEPT $ sudo service iptables save. Another way to open up a port on CentOS/RHEL 6 is to use a terminal-user interface (TUI) firewall client, named system HOW TO DOWNLOAD MULTIPLE FILES WITH WGET While you could invoke wget multiple times manually, there are several ways to download multiple files with wget in one shot. If you know a list of URLs to fetch, you can simply supply wget with an input file that contains a list of URLs. Use -i option is for that purpose. $ wget -i url_list.txt. If URL names have a specific numbering pattern HOW TO CONFIGURE FAIL2BAN TO PROTECT APACHE HTTP SERVER How to configure fail2ban to protect Apache HTTP server. Last updated on September 25, 2020 by Dan Nanni. Apache web server in production environments can be under attack in various different ways. Attackers may attempt to gain access to unauthorized or forbidden directories by using brute-force attacks or executing evil scripts. HOW TO SPECIFY A PRIVATE KEY FILE IN SSHSSH USING PRIVATE KEY FILESSH SPECIFY KEY FILEOPENSSH PRIVATE KEY FILESSH PRIVATE KEY FILESSH PRIVATE KEY FILE PERMISSIONSGIT SPECIFY SSH KEY FILE How to specify a private key file in SSH. Last updated on August 22, 2020 by Dan Nanni. If you connect to a remote server via SSH, which only accepts key authentication, you need to present your private key to the SSH server for authentication.It is straightforward to do HOW TO USE A KEY-VALUE DICTIONARY IN BASH How to use a key-value dictionary in bash. Last updated on February 22, 2021 by Dan Nanni. In any programming language, a dictionary is one of the most fundamental data structures that can store a HOW TO CREATE MULTIPLE NETWORKS ON VMWARE PLAYER How to create multiple networks on VMware Player. Last updated on October 18, 2020 by Dan Nanni. If you have installed VMware Player on Linux, you will notice that VMware Player GUI offers three network options for guest VMs, as shown below: (1) bridged network, (2) NAT network, and (3) host-only network. What if you want to connect your guest VM to multiple isolated virtual networks, each of HOW TO ENABLE SOFTWARE COLLECTIONS (SCL) ON CENTOS How to enable Software Collections (SCL) on CentOS. Last updated on September 23, 2020 by Dan Nanni. Red Hat Enterprise Linux (RHEL) and its community fork, CentOS, offer 10-year life cycle, meaning that each version of RHEL/CentOS is updated with security patches for up to10 years.
HOW TO ACCESS A NAT GUEST FROM HOST WITH VIRTUALBOX On VirtualBox, choose the guest VM you want to access, and open Settings window of the VM. Click on Network menu on the left, click on Advanced to show additional network adapter options. Click on a button labeled Port Forwarding. You will see a window where you can configure port forwarding rules. Click on Add icon in the upper right corner. HOW TO VIEW THREADS OF A PROCESS ON LINUXTOP THREAD SHOWS ON BOTTOMTOP THREAD SHOWS ON BOTTOM To enable thread views in the top output, invoke top with -H option. This will list all Linux threads. You can also toggle on or off thread view mode while top is running, by pressing key. $ top -H. To restrict the top output to a particular process and check all threads running inside the process: $ top -H -p . HOW TO CHECK GLIBC VERSION ON LINUX A simple command-line to check the version of the GNU C library is as follows. $ ldd --version. In this example, the version of glibc is2.19.
HOW TO OPEN A PORT IN THE FIREWALL ON CENTOS OR RHEL Use iptables command to open up a new TCP/UDP port in the firewall. To save the updated rule permanently, you need the second command. $ sudo iptables -I INPUT -p tcp -m tcp --dport 80 -j ACCEPT $ sudo service iptables save. Another way to open up a port on CentOS/RHEL 6 is to use a terminal-user interface (TUI) firewall client, named system HOW TO SET UP SERVER MONITORING SYSTEM WITH MONIT How to set up server monitoring system with Monit. Last updated on August 24, 2020 by Dan Nanni. Many Linux admins rely on a centralized remote monitoring system (e.g., Nagios or Cacti) to check the health of their network infrastructure.While centralized monitoring makes an admin's life easy when dealing with many hosts and devices, a dedicated monitoring box obviously becomes a single HOW TO ENABLE SOFTWARE COLLECTIONS (SCL) ON CENTOS How to enable Software Collections (SCL) on CentOS. Last updated on September 23, 2020 by Dan Nanni. Red Hat Enterprise Linux (RHEL) and its community fork, CentOS, offer 10-year life cycle, meaning that each version of RHEL/CentOS is updated with security patches for up to10 years.
HOW TO SET UP A SECURE FTP SERVICE WITH VSFTPD ON LINUX How to set up a secure FTP service with vsftpd on Linux. Last updated on November 30, 2020 by Dan Nanni. FTP or File Transfer Protocol is one of the widely used services on the Internet, mainly for transferring files from one host to other. HOW TO VIEW THREADS OF A PROCESS ON LINUX Threads are a popular programming abstraction for parallel execution on modern operating systems. When threads are forked inside a program for multiple flows of execution, these threads share certain resources (e.g., memory address space, open files) among themselves to minimize forking overhead and avoid expensive IPC (inter-process communication)channel.
HOW TO ACCESS VNC REMOTE DESKTOP IN WEB BROWSER To launch Websockify, use a startup script called launch.sh. This script starts a mini-webserver as well as Websockify. The --vnc option is used to specify the location of a remotely running VNC server. $ cd noVNC $ ./utils/launch.sh --vnc 192.168.1.10:5900. HOW TO DOWNLOAD YOUTUBE PLAYLIST IN LINUX Support Xmodulo. This website is made possible by minimal ads and your gracious donation via PayPal (Credit Card) or Bitcoin (1M161JGAkz3oaHNvTiPFjNYkeABox8rb4g HOW TO ACCESS A NAT GUEST FROM HOST WITH VIRTUALBOX VirtualBox supports several networking options for guest VMs, one of them being NAT networking. When NAT networking is enabled for a guest VM, VirtualBox automatically performs network address translation between the guest VM and host's network stack, so that you do not have to configure anything on the host machine and local network for the guest VM's networking to work. HOW TO OPEN A PORT IN THE FIREWALL ON CENTOS OR RHEL Use iptables command to open up a new TCP/UDP port in the firewall. To save the updated rule permanently, you need the second command. $ sudo iptables -I INPUT -p tcp -m tcp --dport 80 -j ACCEPT $ sudo service iptables save. Another way to open up a port on CentOS/RHEL 6 is to use a terminal-user interface (TUI) firewall client, named system HOW TO INSTALL AND CONFIGURE TINC VPN ON LINUX How to install and configure tinc VPN on Linux. Last updated on September 28, 2020 by Dan Nanni. tinc is an open-source VPN software with a number of powerful features not found in other VPN solutions. For example, tinc VPN allows peers behind NAT to communicate with one another via VPN directly, not through a third party server.This makes tinc a type of peer-to-peer VPN solution. HOW TO ENABLE SR-IOV VIRTUAL FUNCTION ON INTEL IXGBE NIC SR-IOV is a technology which allows a single PCIe (PCI Express) device to emulate multiple separate PCIe devices. The emulated PCIe functions are called "virtual functions" (VFs), while the original PCIe device functions are called "physical functions" (PFs).SR-IOV is typically used in I/O virtualization environment, where a single PCIe device needs to be shared among multiple virtual machines. HOW TO DOWNLOAD MULTIPLE FILES WITH WGET Support Xmodulo. This website is made possible by minimal ads and your gracious donation via PayPal (Credit Card) or Bitcoin (1M161JGAkz3oaHNvTiPFjNYkeABox8rb4g HOW TO CONFIGURE FAIL2BAN TO PROTECT APACHE HTTP SERVER How to configure fail2ban to protect Apache HTTP server. Last updated on September 25, 2020 by Dan Nanni. Apache web server in production environments can be under attack in various different ways. Attackers may attempt to gain access to unauthorized or forbidden directories by using brute-force attacks or executing evil scripts. HOW TO SPECIFY A PRIVATE KEY FILE IN SSHSSH USING PRIVATE KEY FILESSH SPECIFY KEY FILEOPENSSH PRIVATE KEY FILESSH PRIVATE KEY FILESSH PRIVATE KEY FILE PERMISSIONSGIT SPECIFY SSH KEY FILE How to specify a private key file in SSH. Last updated on August 22, 2020 by Dan Nanni. If you connect to a remote server via SSH, which only accepts key authentication, you need to present your private key to the SSH server for authentication.It is straightforward to do HOW TO CREATE MULTIPLE NETWORKS ON VMWARE PLAYER How to create multiple networks on VMware Player. Last updated on October 18, 2020 by Dan Nanni. If you have installed VMware Player on Linux, you will notice that VMware Player GUI offers three network options for guest VMs, as shown below: (1) bridged network, (2) NAT network, and (3) host-only network. What if you want to connect your guest VM to multiple isolated virtual networks, each of HOW TO USE A KEY-VALUE DICTIONARY IN BASH How to use a key-value dictionary in bash. Last updated on February 22, 2021 by Dan Nanni. In any programming language, a dictionary is one of the most fundamental data structures that can store a HOW TO ENABLE SOFTWARE COLLECTIONS (SCL) ON CENTOS How to enable Software Collections (SCL) on CentOS. Last updated on September 23, 2020 by Dan Nanni. Red Hat Enterprise Linux (RHEL) and its community fork, CentOS, offer 10-year life cycle, meaning that each version of RHEL/CentOS is updated with security patches for up to10 years.
HOW TO BLOCK SPECIFIC USER AGENTS ON NGINX WEB SERVER The modern Internet is infested with various malicious robots and crawlers such as malware bots, spambots or content scrapers which are scanning your website in surreptitious ways, for example to detect potential website vulnerabilities, harvest email addresses, or HOW TO CHECK GLIBC VERSION ON LINUX How to check glibc version on Linux. Last updated on July 9, 2020 byDan Nanni
HOW TO VIEW THREADS OF A PROCESS ON LINUXTOP THREAD SHOWS ON BOTTOMTOP THREAD SHOWS ON BOTTOM Threads are a popular programming abstraction for parallel execution on modern operating systems. When threads are forked inside a program for multiple flows of execution, these threads share certain resources (e.g., memory address space, open files) among themselves to minimize forking overhead and avoid expensive IPC (inter-process communication)channel.
HOW TO OPEN A PORT IN THE FIREWALL ON CENTOS OR RHEL Question: I am running a web/file server on my CentOS box, and to access the server remotely, I need to modify a firewall to allow access to a TCP port on the box. What is a proper way to open a TCP/UDP port in the firewall of CentOS/RHEL? HOW TO DOWNLOAD MULTIPLE FILES WITH WGET Support Xmodulo. This website is made possible by minimal ads and your gracious donation via PayPal (Credit Card) or Bitcoin (1M161JGAkz3oaHNvTiPFjNYkeABox8rb4g HOW TO CONFIGURE FAIL2BAN TO PROTECT APACHE HTTP SERVER How to configure fail2ban to protect Apache HTTP server. Last updated on September 25, 2020 by Dan Nanni. Apache web server in production environments can be under attack in various different ways. Attackers may attempt to gain access to unauthorized or forbidden directories by using brute-force attacks or executing evil scripts. HOW TO SPECIFY A PRIVATE KEY FILE IN SSHSSH USING PRIVATE KEY FILESSH SPECIFY KEY FILEOPENSSH PRIVATE KEY FILESSH PRIVATE KEY FILESSH PRIVATE KEY FILE PERMISSIONSGIT SPECIFY SSH KEY FILE How to specify a private key file in SSH. Last updated on August 22, 2020 by Dan Nanni. If you connect to a remote server via SSH, which only accepts key authentication, you need to present your private key to the SSH server for authentication.It is straightforward to do HOW TO CREATE MULTIPLE NETWORKS ON VMWARE PLAYER How to create multiple networks on VMware Player. Last updated on October 18, 2020 by Dan Nanni. If you have installed VMware Player on Linux, you will notice that VMware Player GUI offers three network options for guest VMs, as shown below: (1) bridged network, (2) NAT network, and (3) host-only network. What if you want to connect your guest VM to multiple isolated virtual networks, each of HOW TO USE A KEY-VALUE DICTIONARY IN BASH How to use a key-value dictionary in bash. Last updated on February 22, 2021 by Dan Nanni. In any programming language, a dictionary is one of the most fundamental data structures that can store a HOW TO ENABLE SOFTWARE COLLECTIONS (SCL) ON CENTOS How to enable Software Collections (SCL) on CentOS. Last updated on September 23, 2020 by Dan Nanni. Red Hat Enterprise Linux (RHEL) and its community fork, CentOS, offer 10-year life cycle, meaning that each version of RHEL/CentOS is updated with security patches for up to10 years.
HOW TO BLOCK SPECIFIC USER AGENTS ON NGINX WEB SERVER The modern Internet is infested with various malicious robots and crawlers such as malware bots, spambots or content scrapers which are scanning your website in surreptitious ways, for example to detect potential website vulnerabilities, harvest email addresses, or HOW TO CHECK GLIBC VERSION ON LINUX How to check glibc version on Linux. Last updated on July 9, 2020 byDan Nanni
HOW TO VIEW THREADS OF A PROCESS ON LINUXTOP THREAD SHOWS ON BOTTOMTOP THREAD SHOWS ON BOTTOM Threads are a popular programming abstraction for parallel execution on modern operating systems. When threads are forked inside a program for multiple flows of execution, these threads share certain resources (e.g., memory address space, open files) among themselves to minimize forking overhead and avoid expensive IPC (inter-process communication)channel.
HOW TO OPEN A PORT IN THE FIREWALL ON CENTOS OR RHEL Question: I am running a web/file server on my CentOS box, and to access the server remotely, I need to modify a firewall to allow access to a TCP port on the box. What is a proper way to open a TCP/UDP port in the firewall of CentOS/RHEL? HOW TO ACCESS VNC REMOTE DESKTOP IN WEB BROWSER How to access VNC remote desktop in web browser. Last updated on November 23, 2020 by Dan Nanni. There are many VNC clients availableon
HOW TO ENABLE SOFTWARE COLLECTIONS (SCL) ON CENTOS How to enable Software Collections (SCL) on CentOS. Last updated on September 23, 2020 by Dan Nanni. Red Hat Enterprise Linux (RHEL) and its community fork, CentOS, offer 10-year life cycle, meaning that each version of RHEL/CentOS is updated with security patches for up to10 years.
HOW TO SET UP SERVER MONITORING SYSTEM WITH MONIT How to set up server monitoring system with Monit. Last updated on August 24, 2020 by Dan Nanni. Many Linux admins rely on a centralized remote monitoring system (e.g., Nagios or Cacti) to check the health of their network infrastructure.While centralized monitoring makes an admin's life easy when dealing with many hosts and devices, a dedicated monitoring box obviously becomes a single HOW TO VIEW THREADS OF A PROCESS ON LINUX Threads are a popular programming abstraction for parallel execution on modern operating systems. When threads are forked inside a program for multiple flows of execution, these threads share certain resources (e.g., memory address space, open files) among themselves to minimize forking overhead and avoid expensive IPC (inter-process communication)channel.
HOW TO SET UP A SECURE FTP SERVICE WITH VSFTPD ON LINUX How to set up a secure FTP service with vsftpd on Linux. Last updated on November 30, 2020 by Dan Nanni. FTP or File Transfer Protocol is one of the widely used services on the Internet, mainly for transferring files from one host to other. HOW TO LIVE STREAM VIDEO FROM WEBCAM ON LINUX Last updated on October 24, 2020 by Dan Nanni. Have you ever wanted to live stream a video feed from your webcam for someone else? You could use any existing video chat software such as Skype, Google Hangouts. HOW TO ACCESS A NAT GUEST FROM HOST WITH VIRTUALBOX VirtualBox supports several networking options for guest VMs, one of them being NAT networking. When NAT networking is enabled for a guest VM, VirtualBox automatically performs network address translation between the guest VM and host's network stack, so that you do not have to configure anything on the host machine and local network for the guest VM's networking to work. HOW TO INSTALL AND CONFIGURE TINC VPN ON LINUX How to install and configure tinc VPN on Linux. Last updated on September 28, 2020 by Dan Nanni. tinc is an open-source VPN software with a number of powerful features not found in other VPN solutions. For example, tinc VPN allows peers behind NAT to communicate with one another via VPN directly, not through a third party server.This makes tinc a type of peer-to-peer VPN solution. HOW TO ENABLE SR-IOV VIRTUAL FUNCTION ON INTEL IXGBE NIC SR-IOV is a technology which allows a single PCIe (PCI Express) device to emulate multiple separate PCIe devices. The emulated PCIe functions are called "virtual functions" (VFs), while the original PCIe device functions are called "physical functions" (PFs).SR-IOV is typically used in I/O virtualization environment, where a single PCIe device needs to be shared among multiple virtual machines. HOW TO OPEN A PORT IN THE FIREWALL ON CENTOS OR RHEL Question: I am running a web/file server on my CentOS box, and to access the server remotely, I need to modify a firewall to allow access to a TCP port on the box. What is a proper way to open a TCP/UDP port in the firewall of CentOS/RHEL?×
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