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 h

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。