shell脚本，按单词出现频率降序排序。

[root@localhost oldboy]# cat file
the squid project provides a number of resources toassist users design,implement and support squid installations. Please browsethe documentation and support sections for more infomation
[root@localhost oldboy]# cat .sh
#!/bin/bash

echo `cat file|xargs -n1 | sort | uniq -c|sort -nr`

[root@localhost oldboy]# bash .sh
 support  squid  and  users  toassist  the  sections  resources  provides  project  Please  of  number  more  installations.  infomation  for  documentation  design,implement  browsethe  a
[root@localhost oldboy]#