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linux 操作系統(tǒng) uniq命令的說明和使用

  發(fā)布時間:2008-09-08 17:06:14   作者:佚名   我要評論
uniq命令的作用:顯示唯一的行,對于那些連續(xù)重復的行只顯示一次! 接下來通過實踐實例說明: [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 h

uniq命令的作用:顯示唯一的行,對于那些連續(xù)重復的行只顯示一次!

接下來通過實踐實例說明:

[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文件的內容,可以看到其中的連續(xù)重復行

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

uniq命令不加任何參數,僅顯示連續(xù)重復的行一次

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

-c 參數顯示文件中每行連續(xù)出現的次數。

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

-d選項僅顯示文件中連續(xù)重復出現的行。

[root@stu100 ~]# uniq -u test
girl took bat home

-u選項顯示文件中沒有連續(xù)出現的行。

[root@stu100 ~]# uniq -f 2 -s 2 test
boy took bat home

忽略每行的前2個字段,忽略第二個空白字符和第三個字段的首字符,結果at home

[root@stu100 ~]# uniq -f 1 test
boy took bat home
dog brought hat home

忽略每行的第一個字段,這樣boy ,girl開頭的行看起來是連續(xù)重復的行。

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