| 1 | #!perl -w
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| 2 | $0 =~ s|\.bat||i;
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| 3 | unless (-f $0) {
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| 4 | $0 =~ s|.*[/\\]||;
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| 5 | for (".", split ';', $ENV{PATH}) {
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| 6 | $_ = "." if $_ eq "";
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| 7 | $0 = "$_/$0" , goto doit if -f "$_/$0";
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| 8 | }
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| 9 | die "`$0' not found.\n";
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| 10 | }
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| 11 | doit: exec "perl", "-x", $0, @ARGV;
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| 12 | die "Failed to exec `$0': $!";
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| 13 | __END__
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| 14 |
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| 15 | =head1 NAME
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| 16 |
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| 17 | runperl.bat - "universal" batch file to run perl scripts
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| 18 |
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| 19 | =head1 SYNOPSIS
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| 20 |
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| 21 | C:\> copy runperl.bat foo.bat
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| 22 | C:\> foo
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| 23 | [..runs the perl script `foo'..]
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| 24 |
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| 25 | C:\> foo.bat
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| 26 | [..runs the perl script `foo'..]
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| 27 |
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| 28 |
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| 29 | =head1 DESCRIPTION
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| 30 |
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| 31 | This file can be copied to any file name ending in the ".bat" suffix.
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| 32 | When executed on a DOS-like operating system, it will invoke the perl
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| 33 | script of the same name, but without the ".bat" suffix. It will
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| 34 | look for the script in the same directory as itself, and then in
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| 35 | the current directory, and then search the directories in your PATH.
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| 36 |
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| 37 | It relies on the C<exec()> operator, so you will need to make sure
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| 38 | that works in your perl.
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| 39 |
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| 40 | This method of invoking perl scripts has some advantages over
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| 41 | batch-file wrappers like C<pl2bat.bat>: it avoids duplication
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| 42 | of all the code; it ensures C<$0> contains the same name as the
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| 43 | executing file, without any egregious ".bat" suffix; it allows
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| 44 | you to separate your perl scripts from the wrapper used to
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| 45 | run them; since the wrapper is generic, you can use symbolic
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| 46 | links to simply link to C<runperl.bat>, if you are serving your
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| 47 | files on a filesystem that supports that.
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| 48 |
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| 49 | On the other hand, if the batch file is invoked with the ".bat"
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| 50 | suffix, it does an extra C<exec()>. This may be a performance
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| 51 | issue. You can avoid this by running it without specifying
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| 52 | the ".bat" suffix.
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| 53 |
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| 54 | Perl is invoked with the -x flag, so the script must contain
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| 55 | a C<#!perl> line. Any flags found on that line will be honored.
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| 56 |
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| 57 | =head1 BUGS
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| 58 |
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| 59 | Perl is invoked with the -S flag, so it will search the PATH to find
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| 60 | the script. This may have undesirable effects.
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| 61 |
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| 62 | =head1 SEE ALSO
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| 63 |
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| 64 | perl, perlwin32, pl2bat.bat
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| 65 |
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| 66 | =cut
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| 67 |
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