uniq 去除重复命令使用方法介绍

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Linux Shell学习:uniq命令使用方法介绍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. [关键字] Linux Shell uniq

看test.txt文件的内容,可以看到其中的连续重复行

[root@hexu.org ~]# cat test.txt
boy took bat home
boy took bat home
girl took bat home
dog brought hat home
dog brought hat 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@hexu.org ~]# uniq test.txt
boy took bat home
girl took bat home
dog brought hat home


-c 参数显示文件中每行连续出现的次数。

[root@hexu.org ~]# uniq -c test.txt
2 boy took bat home
1 girl took bat home
3 dog brought hat home


-d选项仅显示文件中连续重复出现的行。

[root@hexu.org ~]# uniq -d test.txt
boy took bat home
dog brought hat home


-u选项显示文件中没有连续出现的行。

[root@hexu.org ~]# uniq -u test.txt
girl 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@hexu.org ~]# uniq -f 2 -s 2 test.txt
boy took bat 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。

[root@hexu.org ~]# uniq -f 1 test.txt
boy took bat home
dog brought hat home


posted @ 2012-04-18 11:42  wangkangluo1  阅读(4028)  评论(0编辑  收藏  举报