batch if defined
As pointed out previously you missed out a space between favnum and (. You could also use echo What's your favorite color? echo. set /p favnum=">" if "%favnum%"=="" ( goto nope ). or put is the variable not set on one, IF "%Variable%"=="" ECHO Variable is NOT defined. This should help but this works, provided the value of Variable does not contain double quotes. Or you may try. Both worked for me. VERIFY OTHER 2>nul SETLOCAL ENABLEEXTENSIONS IF E
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 batch if defined 相關參考資料
Batch files - How To ... Verify if Variables are Defined
To verify if a variable is defined, we usually check if it has a non-empty value: IF "%MyVar%"=="" ECHO MyVar is NOT defined. This works, provided the value of MyVar does not cont... http://www.robvanderwoude.com Batch - If not defined a variable - Stack Overflow
As pointed out previously you missed out a space between favnum and (. You could also use echo What's your favorite color? echo. set /p favnum=">" if "%favnum%"=="&quo... https://stackoverflow.com How to check if a variable exists in a batch file? - Stack Overflow
IF "%Variable%"=="" ECHO Variable is NOT defined. This should help but this works, provided the value of Variable does not contain double quotes. Or you may try. Both worked for m... https://stackoverflow.com windows - Batch script - SetDefine environment variable if not ...
You could just use If Defined or If Not Defined : @Echo Off If "%~1"=="" GoTo :EOF If Defined %~1 ( Echo='%~1' already defined with value Call Echo=%%%~1%% Pause GoTo :EOF... https://stackoverflow.com windows - Check if an environment variable is defined without ...
OK, this took a bit, but I think I've figured it out. Try this: SET UNDEFINED 2>Nul | Findstr/I "." IF ERRORLEVEL 1 ECHO Not Defined. This works for all cases AFAIK, and does not rel... https://stackoverflow.com How do you check if environment variables are defined in windows ...
I think you mean to write: if not defined MyVar ( echo MyVar is NOT defined ). and if defined MyVar ( echo MyVar IS defined ). This is because cmd.exe will expand the reference to the content of the ... https://stackoverflow.com cmd - windows batch SET inside IF not working - Stack Overflow
var2 is set, but the expansion in the line echo %var2% occurs before the block is executed. At this time var2 is empty. Therefore the delayedExpansion syntax exists, it uses ! instead of % and it is ... https://stackoverflow.com How do I check that a parameter is defined when calling a batch ...
I also fixed a syntax error in the usage echo to escape the greater-than and less-than signs. In addition, the exit needs a /B argument otherwise CMD.exe will quit. @echo off if [%1]==[] goto usage @... https://stackoverflow.com If - Conditionally perform command - Windows CMD - SS64.com
File syntax IF [NOT] EXIST filename command IF [NOT] EXIST filename (command) ELSE (command) String syntax IF [/I] [NOT] item1==item2 command IF [/I] item1 compare-op item2 command IF [/I] item1 compa... https://ss64.com Basics of writing DOS .bat batch files
Basics of writing DOS .bat batch files. Set a variable: SET FOO="bar" Use a variable: echo %FOO% Command line arguments are variables: %1 , %2 etc. Check if a variable is defined: IF NOT DE... https://blog.kowalczyk.info |