StackOverflow have another interesting topic about: Underused features of Windows batch files.
Of course there are many things I didn’t know about. Some highlights:
PUSHD path
Takes you to the directory specified by path.
POPD
Takes you back to the directory you “pushed” from.
By using CALL, EXIT /B, SETLOCAL & ENDLOCAL you can implement subroutines with local variables.
example:
@echo off
set x=xxxxx
call :sub 10
echo %x%
exit /b
:sub
setlocal
set /a x=%1 + 1
echo %x%
endlocal
exit /b
This will print
11
xxxxx
even though :sub modifies x.
Creating an empty file:
> copy nul filename.ext
The equivalent of the bash (and other shells)
echo -n Hello # or
echo Hello\\c
which outputs “Hello” without a trailing newline. A cmd hack to do this:
<nul set /p any-variable-name=Hello
set /p is a way to prompt the user for input. It emits the given string and then waits, (on the same line, i.e., no CRLF), for the user to type a response.
<nul simply pipes an empty response to the set /p command, so the net result is the emitted prompt string. (The variable used remains unchanged due to the empty reponse.)
Problems are: It’s not possible to output a leading equal sign, and on Vista leading whitespace characters are removed, but not on XP.
Command separators:
cls & dir
copy a b && echo Success
copy a b || echo Failure
At the 2nd line, the command after && only runs if the first command is successful.
At the 3rd line, the command after || only runs if the first command failed.
Doesn’t provide much functionality, but you can use the title command for a couple of uses, like providing status on a long script in the task bar, or just to enhance user feedback.
@title Searching for …
:: processing search
@title preparing search results
:: data processing
And there are many more. If you want to learn something new, this topic is must have reading!
