20：单词及字母去重排序案例

用shell处理以下内容

1、按单词出现频率降序排序！

2、按字母出现频率降序排序！

the squid project provides a number ofresources to assist users design,implement and support squid installations.Please browse the documentation and support sections for more infomation,byoldboy training.

课堂实战考察某企业shell面试考试题

http://oldboy.blog.51cto.com/2561410/1686891

解答：

[root@jenkins scripts]# cat paixu.txt|xargs -n1|awk ‘{aa[$1]++} END{for (i in aa) print i,aa[i]}‘|sort -rnk2
support 2
squid 2
and 2
users 1

[root@jenkins scripts]# egrep -o "[a-z]" paixu.txt|awk ‘{aa[$1]++} END{for (j in aa) print j,aa[j]}‘|sort -rnk2
s 19
e 17
o 16
t 14
n 12
i 12
r 11

20：单词及字母去重排序案例

原文：http://www.cnblogs.com/gaoyuechen/p/8001227.html