Linux中uniq命令有什么用

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uniq [选项] 文件

说明：这个命令读取输入文件，并比较相邻的行。在正常情况下，第二个及以后更多个重复行将被删去，行比较是根据所用字符集的排序序列进行的。该命令加工后的结果写到输出文件中。输入文件和输出文件必须不同。如果输入文件用"- "表示，则从标准输入读取。

该命令各选项含义如下：、

- c 显示输出中，在每行行首加上本行在文件中出现的次数。它可取代- u和- d选项。

- d 只显示重复行。

- u 只显示文件中不重复的各行。

- n 前n个字段与每个字段前的空白一起被忽略。一个字段是一个非空格、非制表符的字符串，彼此由制表符和空格隔开(字段从0开始编号)。

+n 前n个字符被忽略，之前的字符被跳过(字符从0开始编号)。

- f n 与- n相同，这里n是字段数。

- s n 与+n相同，这里n是字符数。

接下来通过实践实例说明：

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[root@stu100 ~]# cat testboy took bat homeboy took bat homegirl took bat homeboy took bat homeboy took bat homedog brought hat homedog brought hat homedog brought hat home

看test文件的内容

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[root@stu100 ~]# uniq testboy took bat homegirl took bat homeboy took bat homedog 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 test2 boy took bat home1 girl took bat home2 boy took bat home3 dog brought hat home1

-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 -c14 boy took bat home3 dog brought hat home1 girl took bat home

排序后再显示

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[root@stu100 ~]# uniq -d testboy took bat homeboy took bat homedog brought hat home

-d选项仅显示文件中连续重复出现的行。

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[root@stu100 ~]# uniq -u testgirl 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 testboy 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 testboy took bat homedog brought hat home

忽 略每行的***个字段，这样boy ，girl开头的行看起来是连续重复的行。

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[root@stu100 ~]# uniq -D testboy took bat homeboy took bat homeboy took bat homeboy took bat homedog brought hat homedog brought hat homedog brought hat home

显示所有重复的行，每个重复的行都显示

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