linux 操作系统 uniq命令的说明和使用,linux系统uname命令

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。