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128 lines
4.2 KiB
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[#]: subject: "lnav: Advanced Log File Viewer for Linux Desktops and Servers"
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[#]: via: "https://www.debugpoint.com/advanced-log-file-viewer-lnav-ubuntu-linux/"
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[#]: author: "Arindam https://www.debugpoint.com/author/admin1/"
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[#]: collector: "lkxed"
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[#]: translator: " "
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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lnav: Advanced Log File Viewer for Linux Desktops and Servers
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======
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**If you want to debug or troubleshoot any issues, you need an advanced log file viewer like lnav – which works wonders in the terminal for any Linux system.**
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### lnav: Log file viewer
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lnav can unzip all the compressed log files on the fly and merge them together for a nice display. The display is parsed and formatted based on the types of errors/warnings – this helps to quickly glance through the thousands of logs, especially in servers.
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While analysing the logs, timestamps are very important. So lnav merges multiple logs based on timestamps, which is very helpful for tracking down system issues.
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Most of the important log file format detection is built-in; see below:
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- Common Web Access Log format
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- CUPS page_log
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- Syslog
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- Glog
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- VMware ESXi/vCenter Logs
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- dpkg.log
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- uwsgi
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- “Generic” – Any message that starts with a timestamp
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- Strace
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- sudo
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- GZIP, BZIP
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That is not all; lnav is also capable of the below features, making it an important app for Linux systems.
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- Filter messages based on regular expression
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- A timeline view of errors
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- Pretty-Print view- helps to reformat
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- Query Log using SQL
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- A log is updated in real-time while being searched.
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- Syntax highlight via regular expression (say you want to find out an IP address in the entire log)
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- Tab completion of any word from the log which is displayed !!
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![lnav-running-in-ubutu][1]
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To view the screenshots of the above features and learn more, visit [this page.][2]
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### How to Install
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This program is available in official Ubuntu, Debian repo. Install it using the following command.
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```
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sudo apt install lnav
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```
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And for Fedora, RHEL users, use the below command:
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```
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sudo dnf install lnav
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```
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Also the developers provides an offline standalone executable which you don’t need to install. You can download the zip from the [GitHub release page][3] and execute as:
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```
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./lnav
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```
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**Note**: It’s also available for macOS which you can find in the above GitHub page.
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### lnav: How to use (Basics)
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The simple command syntax is:
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```
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lnav [options] [logfile1 logfile2 …]
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```
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If you run just lnav from the command, it shows all the logs from your system (/var/log/messages and /var/log/syslog)
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```
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lnav
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```
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To view any specific log file, provide it via the command line:
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```
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lnav /var/log/syslog
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```
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Add timestamp in your log output using -t parameter
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```
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lnav -t /var/log/syslog
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```
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Here are some of the key switches of lnav
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```
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-d file Write debug messages to the given file.-a Load all of the most recent log file types.-r Load older rotated log files as well.-t Prepend timestamps to the lines of data being read inon the standard input.-w file Write the contents of the standard input to this file.-c cmd Execute a command after the files have been loaded.-f path Execute the commands in the given file.-n Run without the curses UI. (headless mode)
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```
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![lnav running in Ubuntu 22.04][4]
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For further reading and exploration, visit the [official documentation][5].
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[Next:How to Make LibreOffice Look Like Microsoft Office][6]
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--------------------------------------------------------------------------------
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via: https://www.debugpoint.com/advanced-log-file-viewer-lnav-ubuntu-linux/
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作者：[Arindam][a]
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选题：[lkxed][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.debugpoint.com/author/admin1/
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[b]: https://github.com/lkxed
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[1]: https://www.debugpoint.com/wp-content/uploads/2016/11/lnav-Running-in-Ubutu.png
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[2]: http://lnav.org/features/
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[3]: https://github.com/tstack/lnav/releases/
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[4]: https://www.debugpoint.com/wp-content/uploads/2016/11/lnav-running-in-Ubuntu-22.04.jpg
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[5]: https://docs.lnav.org/en/latest/intro.html
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[6]: https://www.debugpoint.com/libreoffice-like-microsoft-office/
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