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Linux Shell学习:uniq命令使用方法介绍

作者:佚名    责任编辑:admin    更新时间:2022-06-22

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 uniq命令的作用:显示唯一的行,对于那些连续重复的行只显示一次!

  接下来通过实践实例说明:

  [[email protected] ~]# cat test

  boy took bat home

  boy took bat home

  girl took bat home

  dog brought hat home

  dog brought hat home

  dog brought hat home

  看test文件的内容,可以看到其中的连续重复行

  [[email protected] ~]# uniq test

  boy took bat home

  girl took bat home

  dog brought hat home

  uniq命令不加任何参数,仅显示连续重复的行一次

  [[email protected] ~]# uniq -c test

  2 boy took bat home

  1 girl took bat home

  3 dog brought hat home

  -c 参数显示文件中每行连续出现的次数。

  [[email protected] ~]# uniq -d test

  boy took bat home

  dog brought hat home

  -d选项仅显示文件中连续重复出现的行。

  [[email protected] ~]# uniq -u test

  girl took bat home

  -u选项显示文件中没有连续出现的行。

  [[email protected] ~]# uniq -f 2 -s 2 test

  boy took bat home

  忽略每行的前2个字段,忽略第二个空白字符和第三个字段的首字符,结果at home

  [[email protected] ~]# uniq -f 1 test

  boy took bat home

  dog brought hat home

  忽略每行的第一个字段,这样boy ,girl开头的行看起来是连续重复的行。