Linux Command-tail command

The tail command is also a very common command for file viewing classes, and today we will introduce you to the use of the Linux Tail command.

For more information on Linux commands, see: Linux Command Quick check manual

The Linux Tail command is primarily used to write files to standard output starting at the specified point. Many people like to use Tail–f to monitor log files.

First, the Linux Tail command format

The Linux Tail command format is as follows

tail [OPTION] ... [FILE] ...

The Linux Tail command parameters are as follows

-F Loop Read-Q does not display processing information-v displays verbose processing information-c< number > bytes displayed-n< number of rows > Display lines--pid=pid is combined with-F to end after the process id,pid dead. -Q,--quiet,--silent never outputs the header-S of the file name,--sleep-interval=s with-F, which represents the sleep s seconds at each repetition interval

Second, the Linux tail command use example

1) View the last few lines of the file

 $tail-5 linuxdaxue.com-access_log180.175.51.163--[14/jun/2016:11:45:09 +0800] "GET http://www.linuxdaxue.com/ Wp-content/uploads/2016/05/shell-printf_thumb.jpg&h=64&w=100&q=90&zc=0&ct=1 HTTP/1.1 "200 2611180.175.51.163--[14/jun/2016:11:45:09 +0800] "GET Http://www.linuxdaxue.com/wp-content/uploads/2016/05/Shell_ Thumb-2.jpg&h=64&w=100&q=90&zc=0&ct=1 http/1.1 "2572180.175.51.163--[14/Jun/2016:11:45:09 +0800] "GET http://www.linuxdaxue.com/wp-content/uploads/2016/05/Shell_thumb-3.jpg&h=64&w=100&q=90 &zc=0&ct=1 http/1.1 "2580180.175.51.163--[14/jun/2016:11:45:09 +0800]" GET http://www.linuxdaxue.com/ Wp-content/uploads/2016/05/shell_thumb-1.jpg&h=64&w=100&q=90&zc=0&ct=1 HTTP/1.1 "200 2646180.175.51.163--[14/jun/2016:11:45:09 +0800] "GET Http://www.linuxdaxue.com/wp-content/uploads/2016/06/Shell_ Thumb-1.jpg&h=64&w=100&q=90&zc=0&ct=1 http/1.1 "2850$ 

2) show file starting from line 10th

Tail-n +10 Linuxdaxue.com-access_log

3) Cyclic monitoring log file

$tail-F linuxdaxue.com-access_log180.175.51.163--[14/jun/2016:11:45:09 +0800] "GET http://www.linuxdaxue.com/ Wp-content/uploads/2016/05/shell_thumb-1.jpg&h=64&w=100&q=90&zc=0&ct=1 HTTP/1.1 "200 2646180.175.51.163--[14/jun/2016:11:45:09 +0800] "GET Http://www.linuxdaxue.com/wp-content/uploads/2016/06/Shell_ Thumb-1.jpg&h=64&w=100&q=90&zc=0&ct=1 http/1.1 "200 2850

In actual use, our more common function is to use it to monitor log files, which is a very useful feature.

For more information on Linux commands, see: Linux Command Quick check manual

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Linux Command-tail command