THE LOG FILE NAVIGATORFEATURESDOWNLOADSPROJECT BLOG An advanced log file viewer for the small-scale. Watch and analyze your log files from a terminal. No server. No setup. Still featureful. DOWNLOADS — THE LOG FILE NAVIGATORFREE LOG FILE ANALYZERWINDOWS LOG

FILE ANALYZER

Version 0.9.0: (Latest) Source. Mac OS X 10.8 - Statically linked 64-bit binary. OS X Homebrew - brew install lnav. Linux - Statically linked 64-bit binary. Linux Snap - Install the Snap with "sudo snap install lnav". RPM - Statically linked 64-bit binary. DEB - Statically linked 64-bit binary. Github - Git repository WELCOME TO LNAV’S DOCUMENTATION! Welcome to lnav’s documentation!¶ The Log File Navigator (lnav) is an advanced log file viewer for the console.. Contents:

INTRODUCTION

Introduction¶. The Log File Navigator, lnav, is an advanced log file viewer for the terminal.It provides an easy-to-use interface for monitoring and analyzing your log files with little to no setup. Simply point lnav at your log files and it will automatically detect the Log Formats, index their contents, and display a combined view of

all log messages.

USAGE — LNAV 0.9.1 DOCUMENTATION Usage¶. This chapter contains an overview of how to use lnav.. Basic Controls¶. Like most file viewers, scrolling through files can be done with the usual hotkeys.For non-trivial operations, you can enter the command prompt by pressing :.To analyze data in a log file, you can enter the SQL prompt by pressing ;. COMMANDS — LNAV 0.9.1 DOCUMENTATION Commands¶. Commands provide access to some of the more advanced features in lnav, like filtering and “search tables”.You can activate the command prompt by pressing the : key. At the prompt, you can start typing in the desired command and/or double-tap TAB to activate auto-completion and show the available commands. To guide you in the usage of the commands, a help window will appear

CONFIGURATION

Configuration¶. The configuration for lnav is stored in the following JSON files in ~/.lnav:. config.json – Contains local customizations that were done using the :config command.. configs/default/*.json – The default configuration files that are built into lnav are written to this directory with .sample appended. Removing the .sample extension and editing the file will allow you to do COOKBOOK — LNAV 0.9.1 DOCUMENTATION Log Analysis¶. Most log analysis within lnav is done through the SQLite Interface.The following examples should give you some ideas to start leveraging this functionality. One thing to keep in mind is that if a query gets to be too large or multiple statements need to be executed, you can create a .lnav script that contains the statements and execute it using the | command prompt.

HOTKEY REFERENCE

Keypress. Command. m. Mark/unmark the top line. Shift + m. Mark/unmark the range of lines from the last marked to the top. Shift + j. Mark/unmark the next line after the previously marked COMMAND LINE INTERFACE Command Line Interface¶. The following options can be used when starting lnav.There are not many flags because the majority of the functionality is accessed using the -c option to execute commands or SQL queries.. Options¶ THE LOG FILE NAVIGATORFEATURESDOWNLOADSPROJECT BLOG An advanced log file viewer for the small-scale. Watch and analyze your log files from a terminal. No server. No setup. Still featureful. DOWNLOADS — THE LOG FILE NAVIGATORFREE LOG FILE ANALYZERWINDOWS LOG

FILE ANALYZER

Version 0.9.0: (Latest) Source. Mac OS X 10.8 - Statically linked 64-bit binary. OS X Homebrew - brew install lnav. Linux - Statically linked 64-bit binary. Linux Snap - Install the Snap with "sudo snap install lnav". RPM - Statically linked 64-bit binary. DEB - Statically linked 64-bit binary. Github - Git repository WELCOME TO LNAV’S DOCUMENTATION! Welcome to lnav’s documentation!¶ The Log File Navigator (lnav) is an advanced log file viewer for the console.. Contents:

INTRODUCTION

Introduction¶. The Log File Navigator, lnav, is an advanced log file viewer for the terminal.It provides an easy-to-use interface for monitoring and analyzing your log files with little to no setup. Simply point lnav at your log files and it will automatically detect the Log Formats, index their contents, and display a combined view of

all log messages.

USAGE — LNAV 0.9.1 DOCUMENTATION Usage¶. This chapter contains an overview of how to use lnav.. Basic Controls¶. Like most file viewers, scrolling through files can be done with the usual hotkeys.For non-trivial operations, you can enter the command prompt by pressing :.To analyze data in a log file, you can enter the SQL prompt by pressing ;. COMMANDS — LNAV 0.9.1 DOCUMENTATION Commands¶. Commands provide access to some of the more advanced features in lnav, like filtering and “search tables”.You can activate the command prompt by pressing the : key. At the prompt, you can start typing in the desired command and/or double-tap TAB to activate auto-completion and show the available commands. To guide you in the usage of the commands, a help window will appear

CONFIGURATION

Configuration¶. The configuration for lnav is stored in the following JSON files in ~/.lnav:. config.json – Contains local customizations that were done using the :config command.. configs/default/*.json – The default configuration files that are built into lnav are written to this directory with .sample appended. Removing the .sample extension and editing the file will allow you to do COOKBOOK — LNAV 0.9.1 DOCUMENTATION Log Analysis¶. Most log analysis within lnav is done through the SQLite Interface.The following examples should give you some ideas to start leveraging this functionality. One thing to keep in mind is that if a query gets to be too large or multiple statements need to be executed, you can create a .lnav script that contains the statements and execute it using the | command prompt.

HOTKEY REFERENCE

Keypress. Command. m. Mark/unmark the top line. Shift + m. Mark/unmark the range of lines from the last marked to the top. Shift + j. Mark/unmark the next line after the previously marked COMMAND LINE INTERFACE Command Line Interface¶. The following options can be used when starting lnav.There are not many flags because the majority of the functionality is accessed using the -c option to execute commands or SQL queries.. Options¶ FEATURES — THE LOG FILE NAVIGATOR Single Log View. All log file contents are merged into a single view based on message timestamps. You no longer need to manually correlate timestamps across multiple windows or figure out the order in which to view rotated log files.

LOG FORMATS

In addition to the above formats, the following self-describing formats are supported: The Bro Network Security Monitor TSV log format is supported in lnav versions v0.8.3+. The Bro log format is self-describing, so lnav will read the header to determine the shape of the file.. The W3C Extend Log File Format is supported in lnav versions v0.9.1+. The W3C log format is self-describing, so lnav

EXTRACTING DATA

Extracting Data¶. Note: This feature is still in BETA, you should expect bugs and incompatible changes in the future.. Log messages contain a good deal of useful data, but it’s not always easy to get at. The log parser built into lnav is able to extract data as described by Log Formats as well as discovering data in plain text messages. This data can then be queried and processed using the

USER INTERFACE

User Interface¶. The main part of the display shows the log messages from all files sorted by the message time. Status bars at the top and bottom of the screen can given you an

PROJECT BLOG

The release on GitHub. Features: Added the ':comment' command that can be used to attach a comment to a log line. The comment will be displayed below the line, like so: 2017-01-01T15:30:00 error: computer

is

HOW IT WORKS

Read the Docs v: latest . Versions latest stable v0.9.0 v0.8.5 Downloads pdf html epub On Read the Docs Project Home WELCOME TO LNAV’S DOCUMENTATION! Welcome to lnav’s documentation!¶ The Log File Navigator (lnav) is an advanced log file viewer for the console.. Contents:

SQLITE INTERFACE

After pressing Enter, SQLite will execute the query using lnav’s virtual table implementation to extract the data directly from the log files.Once the query has finished, the main window will switch to the DB view to show the results. Press q to return to the log view and press v to return to the log view. If the SQL results contain a log_line column, you can press to Shift + V to switch

LNAV DOCUMENTATION

lnav Documentation, Release 0.9.1 1.3Viewing Logs The arguments to lnav are the log files, directories, or URLs to be viewed. For example, to view all of the CUPS logs SQLITE TABLES REFERENCE SQLite Tables Reference¶. In addition to the tables generated for each log format, lnav includes the following tables/views: environ. lnav_file. lnav_views. lnav_view_stack. lnav_view_filters. lnav_view_filter_stats THE LOG FILE NAVIGATOR

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* Downloads /

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* Documentation /

* Project Blog /

THE LOG FILE NAVIGATOR

ABOUT

THE LOG FILE NAVIGATOR

* About /

* Downloads /

* Features /

* Documentation /

* Project Blog /

AN ADVANCED LOG FILE VIEWER FOR THE SMALL-SCALE WATCH AND ANALYZE YOUR LOG FILES FROM A TERMINAL. NO SERVER.  NO SETUP.  STILL FEATUREFUL.

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IN YOUR TERMINAL

Many logging tools, like Splunk, provide great features but are optimized for large-scale deployments.  They require installing and configuring servers before they can be effectively used.  There is still a need for a robust log file analyzer for the terminal.

EASY TO USE

Just point LNAV to a directory and it will take care of the rest. File formats are automatically detected and compressed files are unpacked on the fly.

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IMPROVED PRESENTATION Log files are a wealth of information, LNAV can help highlight the parts that are important and filter out the noise. -------------------------

IT'S FREE!

Binaries for LNAV are available for Mac OS X and Linux.  See the Downloads page for other packages. ------------------------- SUPPORTING THE PROJECT

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Copyright 2021. Tim Stack