在UNIX shell脚本中的列表中选择唯一的或不同的值

问题描述

我有一个的ksh脚本返回值的一个长长的清单，换行符分开了，我只想看到独特的/不同的值。这是可能做到这一点？

举例来说，说我的输出目录中的文件后缀：

I want to see a list like:

解决方案

You might want to look at the uniq and sort applications.

./yourscript.ksh | sort | uniq

(FYI, yes, the sort is necessary in this command line, uniq only strips duplicate lines that are immediately after each other)

EDIT:

Contrary to what has been posted by Aaron Digulla in relation to uniq's commandline options:

Given the following input:

class
jar
jar
jar
bin
bin
java

uniq will output all lines exactly once:

class
jar
bin
java

uniq -d will output all lines that appear more than once, and it will print them once:

jar
bin

uniq -u will output all lines that appear exactly once, and it will print them once:

class
java

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