方法/步骤 1 if语句用法，判断判断驱动器，文件或文件夹是否存在if exist filename commandif exist filename 是表示：存在 filename意思。判断盘符是否存在的简单例子if exist "e:" (echo e盘存在) else echo e盘不存在。2 @echo offdir /a-d d:\123.bat >nul 2>nulif %errorlevel%==0 (echo 123....
IFEXISTfilenamecommand IFEXISTfilename(delfilename.)ELSEechofilename Missing. IFEXISTfilename( delfilename. )ELSE( echofilename missing. ) 2)IF [NOT] EXIST filename command 如果指定的文件名存在,指定条件为 true。 IF [NOT] ERRORLEVEL number command 如果最后运行的程序返回一个等于或大于指定数字的...
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...
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 ...
感谢用户MC ND，他在评论中提醒我，我已经设法解决了这个问题，事实证明这是一件非常简单的事情，他的...
Error : The Processor above doesn't seem to be exist 如果进程名称是 services 然后写入用户 Error : You can't kill the Processor above 如果进程名称是 valid 而不是 services 然后写入用户 进程已通过 taskill 被终止 所以我称它为进程杀手.bat 这是我的代码: @echo off :Start Rem preparing the...
if...else 是所有高级编程语言都有的必备功能。但现实中的代码往往存在着过多的 if...else。虽然 if...
IF EXIST Product.dat (del Product.dat) ELSE (echo The Product.dat file is missing.) To echo the value of the ERRORLEVEL environment variable after running a batch file, type the following lines in the batch file: Copy goto answer%errorlevel% :answer1 echo Program had return code 1 :answe...
Performs conditional processing in batch programs. Syntax Copy if [not] ERRORLEVEL <number> [else <expression>] if [not] <string1>==<string2> [else <expression>] if [not] exist <filename> [else <expression>] If command extensions are enabled, use the following syntax: Copy if ...
if not exist product.dat echo Cannot find data file 若要在驱动器 A 中格式化磁盘并在格式化过程中发生错误时显示错误消息,请在批处理文件中键入以下行: :begin @echo off format a: /s if not errorlevel 1 goto end echo An error occurred during formatting. :end echo End of batch program. ...