How to? What does ~ do?

[samintz]

I came across a CMD batch file with this syntax:

if "%~1" == "/?" (
    echo usage: ...
    goto :eof
)

What does %~1 mean as opposed to just %1 ? I tried to test it and got the same results both ways.

 

[samintz]

I found where this is documented in CMD. If you do:

CMD /c CALL /?

It will show you the substitution of batch parameters syntax.

For those interested:

%~1         - expands %1 removing any surrounding quotes (")