I'm glad you figured out how to do what you need, but for completeness, I'll add that you can quote the string and access it as a single element (instead of slurping all of @ARGV):
use warnings;
use strict;
if (! defined $ARGV[0]){
print "Usage: ./script.pl \"multi word quoted string here\"\n";
exit;
}
my $string = $ARGV[0];
print "$string\n";
__END__
$ ./str.pl "hello, world!"
hello, world!
Update: I was about to write up an example using Getopt::Long, but found that toolic had already written an example using it a couple of years ago. With Getopt::Long, you have the ability to add optional arguments later, unambiguously.
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