According to this, !==! is the not-equal string operator.
Trying it, I get:
C:\> if "asdf" !==! "fdas" echo asdf
!==! was unexpected at this time.
What am I doing wrong?
Batch not-equal (inequality) operator
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6 Answers
NEQ is usually used for numbers and == is typically used for string comparison.
I cannot find any documentation that mentions a specific and equivalent inequality operand for string comparison (in place of NEQ). The solution using IF NOT == seems the most sound approach. I can't immediately think of a circumstance in which the evaluation of operations in a batch file would cause an issue or unexpected behavior when applying the IF NOT == comparison method to strings.
I wish I could offer insight into how the two functions behave differently on a lower level - would disassembling separate batch files (that use NEQ and IF NOT ==) offer any clues in terms of which (unofficially documented) native API calls conhost.exe is utilizing?
The easiest way I found is to:
IF %ERRORLEVEL% NEQ 0 Echo An error was found
or
IF %ERRORLEVEL% GRT 0 goto error1
The operator !==! has not right value, which means that's used only to know whether a variable was set or not.
IF !%1==! GOTO main
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