The Logfile Navigator 是一个高级的日志查看工具，后面简写为 lnav。

早上在看 [[Logdy]] 的时候（一款可以将终端的输出 （stdout）发送给浏览器 UI 界面，在可视化界面中检索浏览的开源工具），在作者发帖的讨论中，看到有人推荐 lnav 这一款工具，在本地开发的时候，用 lnav 来查看日志。1

在不知道 lnav 之前，我一直都是使用 tail -f, less, zless, more 来查看日志的，但是 less 这一些工具都是不带高亮的，所以每一次都需要通过搜索来找到自己的想要的内容，但看到 lnav 的介绍立即就看到了 lnav 的高亮显示，立马就尝试了一下。

Ubuntu 下

sudo apt install lnav

完整的命令行参数

❯ lnav -h
usage: lnav [options] [logfile1 logfile2 ...]

A curses-based log file viewer that indexes log messages by type
and time to make it easier to navigate through files quickly.

Key bindings:
  ?     View/leave the online help text.
  q     Quit the program.

Options:
  -h         Print this message, then exit.
  -H         Display the internal help text.
  -I path    An additional configuration directory.
  -H         Display the internal help text.
  -I path    An additional configuration directory.
  -i         Install the given format files and exit.  Pass 'extra'
             to install the default set of third-party formats.
  -u         Update formats installed from git repositories.
  -C         Check configuration and then exit.
  -d file    Write debug messages to the given file.
  -V         Print version information.

  -a         Load all of the most recent log file types.
  -r         Recursively load files from the given directory hierarchies.
  -R         Load older rotated log files as well.
  -t         Prepend timestamps to the lines of data being read in
             on 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)
  -q         Do not print the log messages after executing all
             of the commands or when lnav is reading from stdin.

Optional arguments:
  logfile1          The log files or directories to view.  If a
                    directory is given, all of the files in the
                    directory will be loaded.

Examples:
  To load and follow the syslog file:
    $ lnav

  To load all of the files in /var/log:
    $ lnav /var/log

  To watch the output of make with timestamps prepended:
    $ make 2>&1 | lnav -t

Version: lnav 0.8.5