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#!/bin/sh
perl -I /some/special/libpath:/another/special/libpath "$@"

#!/bin/sh
exec perl -I /some/special/libpath:/another/special/libpath "$@"

#!/bin/sh
exec /usr/local/perl-5.42.99/bin/perl -I /some/special/libpath:/anothe
+r/special/libpath "$@"

#!/usr/local/perl-5.42.99/bin/perl 
use lib '/some/special/libpath','/another/special/libpath';

# rest of the script here, unmodified

#!/usr/local/perl-5.42.99/bin/perl 
use lib '/some/special/libpath','/another/special/libpath';
require '/path/to/real/script.pl';

#!/usr/local/perl-5.42.99/bin/perl 
use lib '/some/special/libpath','/another/special/libpath';
...
    die "Could not parse script: $@" if $@;
    die "Could not read script: $!";
}