It expects the name of the file to be searched as the only command line parameter. It will also skip any subroutine whose name begins with an underscore - as I said, this is ripped from a larger program ( the second toy ) doing something similar.

I also cause it to print the line number where the sub definition begins.

#!/usr/bin/perl -w

use strict;
my $source = shift @ARGV || '';
my %keyword = ();

unless ( $source ) {
    print "Usage: $0 <file>\n";
    exit;
}

open SRC, $source or die "Couldn't open $source : $!";
while( <SRC> ) {
    my ( $package, $name );
    $package = $1 if ( ! $package && /^package\s+(.+);/ );

    next unless ( /^sub\s+(.+){\s*$/ );
    $name = $1;

    next if ( substr($name,0,1) eq "_" );

    $name =~ s/\s+$//;
    $keyword{$name} = $.;
}

close SRC;

for ( keys %keyword ) {
    print "$keyword{$_}:$_\n";
}
[download]

Update: Do NOT use Opera for Solaris when submitting - it seems to add a whole lot of newlines. Sorry for the mess.

HTH,
mikfire