Linux常用命令-tail

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命令

tail

描述

output the last part of files
查看文件后几行

用法

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

选项

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Options:
  -c  显示文件的后几个字节
  -f  实时追加显示文件新增内容,等同于tailf命令
  -n  显示文件的后几行,可以简写,如-n 5简写为-5
  -v  显示文件名

注意

无

示例

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$ tail -5 a
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$ tail -n3  a
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# 显示文件后3行并且显示文件名
$ tail -vn3 a b
==> a <==
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==> b <==
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# 实时显示文件新增内容
$ tail -f /var/log/messages 
Feb  8 15:00:01 centos7 systemd: Started Session 18 of user root.
Feb  8 15:00:21 centos7 systemd: Time has been changed
Feb  8 15:01:03 centos7 systemd: Started Session 19 of user root.
Feb  8 15:01:27 centos7 systemd: Time has been changed
Feb  8 15:02:33 centos7 systemd: Time has been changed

$ tailf /var/log/messages
Feb  8 15:07:58 centos7 systemd: Time has been changed
Feb  8 15:09:02 centos7 systemd: Time has been changed
Feb  8 15:10:01 centos7 systemd: Started Session 20 of user root.
Feb  8 15:10:05 centos7 systemd: Time has been changed