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Executing Windows commands using backtick

by marincdyer (Initiate)
on Apr 22, 2013 at 12:11 UTC ( #1029855=perlquestion: print w/ replies, xml ) Need Help??
marincdyer has asked for the wisdom of the Perl Monks concerning the following question:

I have found numerous hits relating to the execution of Windows commands using the Perl `command` (back tick) but none work. The command string that I'm trying to execute actually contains UTF-8 encoded data. The problem is that the windows has already translated the UTF-8 data invalidly because of the code page associated with the thread established by windows to execute the command not being 65001

I have tried executing the perl script that eventually executes the windows command in an environment where CHCP has been set to 65001 but it makes no difference

Has anyone successfully executed a Windows command issued from within PERL where the Windows parameter data contains UTF8

It goes without saying that exactly the same PERL code works perfectly when executing the Linux variant of the Windows command on Redhat/Suse environments passing exactly the same UTF8 encoded argument data

Comment on Executing Windows commands using backtick
Re: Executing Windows commands using backtick
by hdb (Parson) on Apr 22, 2013 at 12:17 UTC

    Does this not mean you cannot execute the same command from the command line either? Or how do you do it?

    Can your Windows command read from file instead? You could create a temp file in Perl that the command will read from.

      It transpires that you are probably right. It appears that if you place all of the parameters into a parameter file with a UTF-8 BOM then the utility will accept the request from the parmfile.

      Perfect! Job's a good 'un

      .
Re: Executing Windows commands using backtick
by Anonymous Monk on Apr 22, 2013 at 13:14 UTC
Re: Executing Windows commands using backtick
by rpnoble419 (Pilgrim) on Apr 22, 2013 at 16:40 UTC

    Have you tried to execute the commands from the command line without perl?

    I'd try that first, then I would have perl create a .bat file or use a template file to execute what you want to do and then run the batch file. I suggest the template method as the file may need to be encoded in the correct code page to execute correctly

    Stackoverflow.com has several items that may help you on this as well.

Re: Executing Windows commands using backtick
by 2teez (Priest) on Apr 22, 2013 at 20:08 UTC

    ~ I have found numerous hits relating to the execution of Windows commands using the Perl `command` (back tick) but none work.

    No example on what you meant by "windows commands" were given, so how do one know what you are referring to?

    ~ Has anyone successfully executed a Windows command issued from within PERL where the Windows parameter data contains UTF8

    First of, there is nothing like PERL as Perl is not an acronym see What's the difference between "perl" and "Perl"?

    Secondly, however to display UTF-8 output to command shell in Win7 the following work for me:

    #!/usr/bin/perl use warnings; use strict; use utf8; my $null = `chcp 65001`; ## changes the Active Page Code to 65001 binmode STDOUT, ":encoding(UTF-8)"; print "\x{03B1}\x{03C9}\n";
    Note: The reason for the use of backtick here instead of function like system is because, one doesn't want the string Active Page Code: 65001 displayed on the CLI. So, variable "$null" was not used, though the return string were saved in that variable.
    Hope this help atleast.

    If you tell me, I'll forget.
    If you show me, I'll remember.
    if you involve me, I'll understand.
    --- Author unknown to me

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