Windows common commands (Advanced statement)

Variable operation:

定义变量：set  val=abc提示输入变量：set  /p  val=请输入变量：val替换：set  val=%val:a=b%  #把变量%val%中的a替换成b截取：set  val=%val:~0,3%  #截取val的前3位计算：set  /a  a=%b%+1  #设置变量a的值为变量b+1

Judgment statement:
A. Syntax:

if  条件  (    逻辑)  else  (    逻辑)

B. Conditions:

判断字符串是否相等："字符串1"=="字符串2"判断数值是否相等：数值1  equ  数值2判断文件/文件夹是否存在：exist 文件名判断变量是否已定义：defined  变量判断上个语句的返回值：%errorlevel%  #为0执行成功，否则执行失败

Loop statement:
A. Syntax:
B. Usage:

Windows common commands (Advanced statement)