Like this:

AppleScript

set theWindowTitle to "PerlMonks"
set theOption to text returned of (display dialog "Enter a Source fold
+er:" & return default answer "" with title theWindowTitle)
set thePerlScript to quoted form of (POSIX path of ((choose file with 
+prompt "Select a script:") as Unicode text))
set theResult to do shell script thePerlScript & " -S " & theOption
display dialog "Result: " & theResult with title theWindowTitle
[download]

Perl

#!/usr/bin/perl
use strict;
use warnings;
use Getopt::Long;
Getopt::Long::Configure("ignore_case");
my %options;
GetOptions(\%options, "SourceFolder=s");
print $options{SourceFolder};
[download]

Update: see also Getopt::Long

Regards, Karl

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