enrgyxprt has asked for the wisdom of the Perl Monks concerning the following question:

Because Im working on a production pc, I cant develop or troubleshoot my last step without fear. So, I defer to the gods... I have working from cmd

START "" "C:\Users\bla-bla\myexe.exe" "C:\Users\Glenn\Desktop\test.blt
+"

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and need to have my.pl do the same.

#my.pl
$myexe="C:/Users/bla-bla/myexe.exe";
$myfile="C:/Users/Glenn/Desktop/test.blt";
exec ('$myexe $myfile');

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But that only opens a small cmd window, and doesn't launch $myexe. I didnt expect it to work, but tried

...
exec '""','$myexe','$myfile';

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And realize Im out of my league. Any ideas ?

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Re: perl equiv to cmd start
by AnomalousMonk (Archbishop) on Jan 17, 2017 at 19:20 UTC
    exec ('$myexe $myfile');
    ...
    exec '""','$myexe','$myfile';

    Judging by hippo's post, it seems you may already have abandoned your post. If not, you should realize that single-quotes do not interpolate scalars (update: or anything else). E.g.,: 

    c:\@Work\Perl\monks>perl -wMstrict -le
"my $myexe  = 'foo';
 my $myfile = 'bar';
 ;;
 my $string = '$myexe $myfile';
 print qq{>$string<};
"
>$myexe $myfile<

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    Please see Quote and Quote-like Operators in perlop.

    Give a man a fish:  <%-{-{-{-<

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      I did not abandon the post you read, Just a poorly typed previous post. As Im new to this forum, Im having trouble navigating its functions. Add to it Im having a head banging day with perl...

      I did remember that, vaguely, and thank you.

      Ultimately got it sorted out! 

       $mylaunch="START \"\" \"$myexe\" \"$myfile\"";
exec("$mylaunch");

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        to avoid backslash-orgies like this, you might be interested in the qq function operator. The corresponding entry in perlfunc is a bit terse, but see perlop under Quote and Quote like Operators. The nice thing about it is that you can choose the delimiter that you want
        Non-bracketing delimiters use the same character fore and aft, but the four sorts of ASCII brackets (round, angle, square, curly) all nest
        Your solution could then mutate to e.g.
        $mylaunch = qq !START "" "$myexe" "$myfile"! ;
exec("$mylaunch");

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        (as with "normal" functions, you are allowed to have whitespace between function name and opening delimiter)
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Re: perl out from batch shell
by hippo (Archbishop) on Jan 17, 2017 at 13:55 UTC
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