A Linux command has become the trend of 2024

Overview

lnav is a powerful log file viewing tool that allows users to easily view and analyze log files in the command line interface. Through lnav, users can easily search and filter log information in the command line interface, which is particularly useful for servers without a graphical user interface. Especially when in-depth analysis of log files is required, lnav can provide an efficient solution. Through the use of lnav, users can locate and solve problems more quickly and improve work efficiency.

Function

lnav can intelligently identify a variety of common log formats and highlight key information in a highlighted manner, helping users quickly locate and pay attention to important content in the logs.

lnav can monitor changes in log files in real time, similar to the function of the tail -f command. This means that when new log entries are added to the log file, lnav will automatically update the display without requiring the user to refresh manually.

lnav provides SQL-like query syntax, allowing users to perform complex queries and analysis on log files. This functionality allows users to conduct in-depth search and analysis of logs based on their individual needs.

lnav will automatically record the user's query history, allowing users to easily view and modify previous queries. This is particularly useful for users who frequently perform similar queries.

use

The command format to use lnav to view log files is:

lnav 日志文件路径

For example, if you have a log file named access.log, you can view it using the following command:

lnav /var/log/access.log

In the lnav interface, you can use the arrow keys to scroll through the logs, use / to search for content, and use : to perform queries.

Example

Suppose you have a log file named access.log with the following content:

127.0.0.1 - - [28/Feb/2024:10:57:03 +0800] "GET / HTTP/1.1" 200 612 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:15.0) Gecko/20100101 Firefox/15.0.1" 
127.0.0.1 - - [28/Feb/2024:10:58:03 +0800] "GET /favicon.ico HTTP/1.1" 404 209 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:15.0) Gecko/20100101 Firefox/15.0.1"

You can use the lnav command to view this file:

lnav /var/log/access.log

This will display the contents of the file in the terminal, with key information automatically highlighted. You can use the arrow keys to scroll through the logs, / to search for content, and : to perform queries.

lnav is a powerful log file viewer that provides many advanced features, such as automatic highlighting, real-time viewing, log query, etc. By learning and using lnav, you can view and analyze log files more efficiently. Whether you are a system administrator or a developer who needs to work with log files, lnav is a very useful tool. It helps you better understand and analyze the behavior of your system for better troubleshooting and performance optimization. So, if you haven’t tried lnav yet, now is the time to start!

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