这用于删除字符串的第一个和最后一个字符
示例
@echo off
set str=Batch scripts is easy. It is really easy
echo %str%
set str=%str:~1,-1%
echo %str%
关于上述程序中，~1，-1用于删除字符串的第一个和最后一个字符。
以上命令产生以下输出。
Batch scripts is easy. It is really easy
atch scripts is easy. It is really eas
