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LinuxShell学习:uniq命令使用方法介绍

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urUpRstH 发表于 2012-1-8 22:57 | 显示全部楼层 |阅读模式
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:

[root@stu100 ~]# 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

[root@stu100 ~]# 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

[root@stu100 ~]# 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。

[root@stu100 ~]# 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。

[root@stu100 ~]# uniq -u test

girl took bat home

-u选项显示文件中没有连续出现的行。

[root@stu100 ~]# 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

[root@stu100 ~]# 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。

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