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if [/i] <string1> <compareop> <string2> [else <expression>] if cmdextversion <number> [else <expression>] if defined <variable> [else <expression>] Parameters Expand table ParameterDescription not Specifies that the command should be carried out only if the condition is false. erro...
if [not] exist FileName Command [else Expression] If command extensions are enabled, use the following syntax: if [/i] String1 CompareOp String2 Command [else Expression] if cmdextversion Number Command [else Expression] if defined Variable Command [else Expression] Parameters not Specifies that...
if [not] exist FileName command [else expression] If command extensions are enabled, use the following syntax: if [/i] string1 CompareOp string2 command [else expression] if cmdextversion number command [else expression] if defined variable command [else expression] Parameters not : Specifies ...
第二种用法:IF [NOT] string1==string2 command 第三种用法:IF [NOT] EXIST filename command IF增强的用法 IF [/I] string1 compare-op string2 command #参数/I表示不区分大小写 IF CMDEXTVERSION number command IF DEFINED variable command #判断变量是否存在,很有用 CMDEXTVERSION 条件的作用跟 ERRORLE...
By default, this command does % not format its argument. There is also a |\bibfnamefont| command for the first % names, to be user-defined. % % Editor names in a collection or in a book will not normally have these % fonts applied to them; this may be additionally selected. % %...
"Variable str3 is not defined" 1. 2. if exists 语句 “ if”语句的另一个特殊情况是“if exist”,用于测试文件是否存在。以下是该语句的一般语法。 If exist somefile.ext do_something 1. 以下是如何使用“if exist”语句的示例。 @echo off ...
ERROR: Variable: found in expression: is not defined. ERROR:Cannot process argument transformation on parameter 'DriveLetter'. Cannot convert value "$DriveLetter" to type "System.Char". Error: "String must be exactly one character long." escape the single quote inside an insert statement Escapin...
ifdefined <variable> [else<expression>] 参数 说明 not //指定仅当条件为 false 时才应执行该命令。 errorlevel <number> //仅当由 Cmd.exe 运行的上一个程序返回等于或大于 数字的退出代码时,才指定 true 条件。 //如果满足前面的条件,则指定应执行的命令。 <string1>==<string...
if defined <variable> [else <expression>]参数说明 not //指定仅当条件为 false 时才应执⾏该命令。errorlevel <number> //仅当由 Cmd.exe 运⾏的上⼀个程序返回等于或⼤于数字的退出代码时，才指定 true 条件。 //如果满⾜前⾯的条件，则指定应执⾏的命令。<string1>==<string2...