Linux Shell学习：uniq命令使用方法介绍

撒旦

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。