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Dont Display STDER on Console

by anshumangoyal (Scribe)
on Oct 05, 2012 at 10:45 UTC ( #997436=perlquestion: print w/ replies, xml ) Need Help??
anshumangoyal has asked for the wisdom of the Perl Monks concerning the following question:

I am using windows batch to check if Perl is installed on my machine and if it is not installed i install it using command line. This is my code:
FOR /F "tokens=*" %%A IN ('perl -v ^| FIND "This is perl 5, version 12 +, subversion 4 (v5.12.4) built for MSWin32-x86-multi-thread"') DO SET + Variable=%%A IF "%Variable%"=="This is perl 5, version 12, subversion 4 (v5.12.4) b +uilt for MSWin32-x86-multi-thread" ( ECHO Perl 5.12.4 ECHO. ) ELSE ( call msiexec /i win_packages\01_ActivePerl-5.12.4.1205-MSWin32-x86 +-294981.msi /q /l*v logs.txt >> Logs 2>&1 IF %errorlevel% GTR 0 ( echo 01 - Failed to Install 'ActivePerl-5.12.4.1205-MSWin32-x8 +6-294981.msi'. Got Error %errorlevel%. GOTO END ) )
Now the problem is if perl is not installed perl -v throws error which is displayed on output screen which I dont want. Can some one help me routing the output to > nul here.

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Re: Dont Display STDER on Console
by BrowserUk (Pope) on Oct 05, 2012 at 10:59 UTC

    The perl link is tenuous at best, but ...

    C:\test>prel -v 2>nul | find "perl" C:\test>perl -v 2>nul | find "perl" This is perl, v5.10.1 built for MSWin32-x64-multi-thread (with 2 registered patches, see perl -V for more detail) this system using "man perl" or "perldoc perl". If you have access to + the Internet, point your browser at http://www.perl.org/, the Perl Home Pa +ge.

    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.

    RIP Neil Armstrong

      It gives me this error: 2> was unexpected at this time. This was my code:
      FOR /F "tokens=*" %%A IN ('perl -v 2>nul ^| FIND "This is perl 5, vers +ion 12, subversion 4 (v5.12.4) built for MSWin32-x86-multi-thread"') +DO SET Variable=%%A
        It gives me this error: 2> was unexpected at this time.

        Escape the '>' in the same way that you escaped the '|'.

        C:\test>for /f "tokens=*" %a in ('prel -v 2^>nul ^| find "perl"') do @ +echo %a C:\test>for /f "tokens=*" %a in ('perl -v 2^>nul ^| find "perl"') do @ +echo %a This is perl, v5.10.1 built for MSWin32-x64-multi-thread (with 2 registered patches, see perl -V for more detail) this system using "man perl" or "perldoc perl". If you have access to + the Internet, point your browser at http://www.perl.org/, the Perl Home Pa +ge.

        With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
        Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
        "Science is about questioning the status quo. Questioning authority".
        In the absence of evidence, opinion is indistinguishable from prejudice.

        RIP Neil Armstrong

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