#!/bin/sh
#edit by m.survivalescaperooms.com
# [:upper:] [ A - Z ]
# [:lower:] [ a - z ]
# [:digit:] [ 0 - 9 ]
# [:alnum:] [ 0 - 9 a - z A-Z]
# [:space:] 空格或t a b鍵
# [:alpha:] [ a - z A - Z ]
# tr
for f in *
do
echo $f | tr "[:upper:]" "[:lower:]"
done
#awk
#把當前目錄下的所有小寫文件名都改為大寫文件名。
ls | awk '{printf("mv %s %s/n", $0, toupper($0))|"sh"}'
#把當前目錄下的所有大寫文件名都改為小寫文件名。
ls | awk '{printf("mv %s %s/n", $0, tolower($0))|"sh"}'
#sed
file="test.txt"
cat $file | sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'