uniq下令的使用

uniq命令的使用

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[root@stu100 ~]#cat test
boy took bat home
boy took bat home
girl took bat home
boy took bat home
boy took bat home
dog brought hat home
dog brought hat home
dog brought hat home

看test文件的内容
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[root@stu100 ~]# uniq test

boy took bat home
girl took bat home
boy 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
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[root@stu100 ~]# uniq -c test
????? 2 boy took bat home
????? 1 girl took bat home
????? 2 boy took bat home
????? 3 dog brought hat home
????? 1?

-c 参数显示文件中每行连续出现的次数。
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[root@stu100 ~]# cat test |sort | uniq -c?
????? 1?
????? 4 boy took bat home
????? 3 dog brought hat home
????? 1 girl took bat home

排序后再显示
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[root@stu100 ~]# uniq -d test
boy took bat home
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。
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[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
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[root@stu100 ~]# uniq -f 1 test
boy took bat home
dog brought hat home


忽略每行的第一个字段

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[root@stu100 ~]# uniq -D test
boy took bat home
boy took bat home
boy took bat home
boy took bat home
dog brought hat home
dog brought hat home
dog brought hat home

显示所有重复的行，每个重复的行都显示

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