how to match '\r\n' in dos environment

From: Liang (leo2002chen_at_hotmail.com)
Date: 08/27/04 

Date: Fri, 27 Aug 2004 18:54:54 +0800

hi,

I want to convert a file from dos formate to unix format. This is very easy
in unix. But in dos environment, the script can't work.

The perl version I used is:5.001.

Anyone knows the clue? thanks in advance,

open(INPUT, "<$opt_f");
rename( $opt_f, "$opt_f.bak") || die "Unable to rename $opt_f\n$!\n";
open(OUTPUT, ">$opt_f");
while(<INPUT>) {
 if ( s/\r\n/\n/ ) {
    $linesFixed++;
 }
 print OUTPUT;
}

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