uniq - remove duplicate lines from a sorted file (從排序的文件中刪除重複的行)

uniq

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This article is about the Unix utility. 

uniq

Original author(s)	Ken Thompson
Developer(s)	AT&T Bell Laboratories
Initial release	February 1973; 46 years ago
Operating system	Unix and Unix-like, MSX-DOS
Type	Command
License	GNU GPL v3
Website	http://man7.org/linux/man-pages/man1/uniq.1.html

uniq - remove duplicate lines from a sorted file  

          從排序的文件中刪除重複的行

uniq is a Unix utility which, when fed a text file or STDIN, outputs the text with adjacent identical lines collapsed to one, unique line of text.

uniq是Unix實用程序，當輸入文本文件或STDIN時，它以折疊的相鄰相同行輸出為一行唯一的文本來輸出文本。

Overview[edit]

The command is a kind of filter program. Typically it is used after sort. 該命令是一種過濾程序。通常在之後使用sort。

It can also output only the duplicate lines (with the -d option), 它還可以僅輸出重複的行（帶-d選項）

or add the number of occurrences of each line (with the -c option). 或增加每行的出現次數（帶-c選項）。

An example: To see the list of lines in a file, sorted by the number of times each occurs:

一個示例：要查看文件中的行列表，按行出現的次數排序：

sort file | uniq -c | sort -n

Using uniq like this is common when building pipelines in shell scripts.

在shell腳本中構建管道時，通常會像這樣使用uniq 。