Is it possible to use a piped stdin stream inside a batch file?
I want to be able to redirect the output of one command into my batch file
process.bat list so:
C:\>someOtherProgram.exe | process.bat
My first attempt looked like:
echo OFF setlocal :again set /p inputLine="" echo.%inputLine% if not (%inputLine%)==() goto again endlocal :End
When I test it with
type testFile.txt | process.bat it prints out the first line repeatedly.
Is there another way?
set /p doesn't work with pipes, it takes one (randomly) line from the input.
But you can use
more inside of an for-loop.
@echo off setlocal for /F "tokens=*" %%a in ('more') do ( echo #%%a )
But this fails with lines beginning with a semicolon (as the FOR-LOOP-standard of eol is
And it can't read empty lines.
But with findstr you can solve this too, it prefix each line with the linenumber, so you never get empty lines.
And then the prefix is removed to the first colon.
@echo off setlocal DisableDelayedExpansion for /F "tokens=*" %%a in ('findstr /n $') do ( set "line=%%a" setlocal EnableDelayedExpansion set "line=!line:*:=!" echo(!line! endlocal )
Alternatively, on some environments (like WinRE) that don't include
findstr, an alternative with
find.exe might suffice.
find will accept a null search string
"", and allows search inversion. This would allow something like this:
@echo off setlocal DisableDelayedExpansion for /F "tokens=*" %%a in ('find /v ""') do ( set "line=%%a" echo(!line! )