来自：http://www.enet.com.cn/article/2008/0805/A20080805341365.shtml
uniq命令的作用：显示唯一的行，对于那些连续重复的行只显示一次！ 接下来通过实践实例说明： [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文件的内容，可以看到其中的连续重复行 [root@stu100 ~]# uniq test boy took bat home girl 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 [root@stu100 ~]# uniq -c test 2 boy took bat home 1 girl took bat home 3 dog brought hat home -c 参数显示文件中每行连续出现的次数。 [root@stu100 ~]# uniq -d test 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。 [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 [root@stu100 ~]# uniq -f 1 test boy took bat home dog brought hat home 忽略每行的第一个字段，这样boy ，girl开头的行看起来是连续重复的行。
