I needed something to convert arbitrarily between dos, mac and unix line endings, so I modified the original script. It could stand some improving (e.g. I broke being able to act on multiple files), and further testing, but it works for my purposes so here it is (hope it doesn't get too garbled):

#!/usr/bin/perl
# Based on: http://perlmonks.thepen.com/8991.html
#
# Extended to handle to->from conversion of the following
#  platforms: dos, mac, unix
#
# 20021125 miles@cmu.edu
#

use strict;

use Getopt::Long;
use File::Copy;

my ($optFrom, $optTo, $optInFile, $optBackup);
GetOptions('from=s' => \$optFrom, 'to=s' => \$optTo,
           'infile=s' => \$optInFile,
           'backup' => \$optBackup);

my $usage = "Usage: $0 --from <platform> --to <platform> --infile <pat
+h_to_file> [--backup]\n\nConverts line endings of text files from a g
+iven platform to line endings\nof a given platform.  Allowable plafor
+ms are:\n\tdos (CRLF)\n\tmac (CR)\n\tunix (LF)\nFrom and to platforms
+ must be different\n\nOptional backup switch causes infile to be save
+d as another file with '.bak'\nappended to its name before the new fi
+le is written.\n";

if (!defined($optFrom) || !defined($optTo) || !defined($optInFile)) {
    print "$usage\n";
    exit 1;
}

if (!defined($optBackup)) {
    $optBackup = 0;
}

my ($lineEndingFrom, $lineEndingTo);

if ($optFrom eq $optTo) {
    print "$usage\n";
    exit 1;
}

if ($optFrom eq 'unix') {
    $lineEndingFrom = "\012";
} elsif ($optFrom eq 'dos') {
    $lineEndingFrom = "\015\012";
} elsif ($optFrom eq 'mac' ) {
    $lineEndingFrom = "\015";
} else {
    print "$usage\n";
    exit 1;
}

if ($optTo eq 'unix') {
    $lineEndingTo = "\012";
} elsif ($optTo eq 'dos') {
    $lineEndingTo = "\015\012";
} elsif ($optTo eq 'mac' ) {
    $lineEndingTo = "\015";
} else {
    print "$usage\n";
    exit 1;
}

my @files;
push(@files, $optInFile);

for my $file ( @files ) {
    open FILE, $file or next;        # thanks turnstep
    my @lines = <FILE>;
    close FILE;

    foreach my $i ( 0..$#lines ) {
        $lines[$i] =~ s/$lineEndingFrom/$lineEndingTo/g;
    }

    if ($optBackup) {
        copy($file, "$file.bak");
    }

    open FILE,">$file";
    print FILE @lines;
    close FILE;
}

# EOF
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