参照:http://blog.csdn.net/yinxusen/article/details/7450213 集合A = {a, b, c} 集合B = {d, e, c, b} $ man uniqWith no options, matching lines are merged to the first occurrence.-d, --repeatedonly print d
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 b
-c, --count prefix lines by the number of occurrences\n\ -d, --repeated only print duplicate lines, one for each group\n\ "), stdout); -u, --unique only print unique line
csdn上还真有人分析这个命令的源代码。 其实不容易啦。 最后一个 d d d d 其实是用得check_file函数里面的//457行的 writeline函数。 [root@localhost src]# gdb ./uniq GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-94.el7 Copyright (C) 2013 F