今天主要分享一個用shell腳本來實現單詞及字母去重排序案例，下面一起來看下吧~

需求

1、按單詞出現頻率降序排序！

2、按字母出現頻率降序排序！

相關文本：

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

實現腳本：

#!/bin/bash
################################################
# File Name: abc.sh
################################################
?
a="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"
?
echo "按單詞出現頻率降序排序！"
for i in $a 
 do 
 echo $i 
done|
 sort |uniq -c|sort -nk1 -r
echo "按字母出現頻率降序排序！"
echo $a |grep -o "[a-z]" |sort|uniq -c |sort -nk1 -r

執行結果：