方法/步骤 1 if命令3种基本用法，可以通在cmd中使用if /?来查看到。IF [NOT] ERRORLEVEL number comman IF [NOT] string1==string2 commandIF [NOT] EXIST filename command 2 if 条件表达式 (语句1) else (语句2)，条件表达式成立执行语句1，否则，将执行语句2；if语句几个常用的用法，判断驱动器、文件...
[ -u FILE ] 如果 FILE 存在且设置了SUID (set user ID)则为真。 [ -w FILE ] 如果 FILE 如果 FILE 存在且是可写的则为真。 [ -x FILE ] 如果 FILE 存在且是可执行的则为真。 [ -O FILE ] 如果 FILE 存在且属有效用户ID则为真。 [ -G FILE ] 如果 FILE 存在且属有效用户组则为真。 [ ...
If that is the case, it executes the directives in the first set of brackets and displays the “The file or folder exists” message. Without a file or folder, it executes the “else” block and prints the “The file or folder does not exist” message on the command prompt screen. We ...
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 ERRORLEVEL 的一样,除了它是在跟与命令扩展名有关联的内部...
Performs conditional processing in batch programs. Syntax if [not] errorlevel Number Command [else Expression] if [not] String1**==**String2 Command [else Expression] if [not] exist FileName Command [else Expression] If command extensions are enabled, use the following syntax: if [/i] Strin...
Performs conditional processing in batch programs.执行批处理程序中的条件处理。 1、简介 IF[NOT]ERRORLEVEL number command IF[NOT]string1==string2 command IF[NOT]EXIST filename command NOT # Specifies that Windows should carry out the command only if the condition is false.指定只有条件为 false 的...
check if computer exist in ou Check if drive exists, If not map Check if Email address exists in Office 365 and if exists, Create a Unique Email address Check if event log source exists for non admins Check if file created today and not 0 KB Check if HyperThreading is enabled Check if...
Performs conditional processing in batch programs. For examples of how to use this command, see Examples. Syntax 复制 if [not] ERRORLEVEL <Number> <Command> [else <Expression>] if [not] <String1>==<String2> <Command> [else <Expression>] if [not] exist <FileName> <Command> [else <...
Performs conditional processing in batch programs. Syntax if [not] errorlevel number command [else expression] if [not] string1**==**string2 command [else expression] if [not] exist FileName command [else expression] If command extensions are enabled, use the following syntax: if [/i] strin...
if failures exist if fate comes if for any reason i d if for free so if from the right cou if fulfil if have no if he be poor and not if he becomes a star if he betrays you twi if he gets lost if he refused if i aint got you fea if i am seriousbr if i come all the ...