Without checking the return values of your open statements, can you be sure the files are actually being opened?

open( IN, '<', 'test.txt' ) or die "Couldn't open infile.\n$!";
open( OUT, '>', 'test.out' ) or die "Couldn't open outfile.\n$!";

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You can also check to see that you're actually getting the results you want after the substitution by adding a print statement (for debugging purposes only) as follows: 

# after your substitution...
print $_;
print OUT $_;

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Dave

In reply to Re: working with files by davido
in thread working with files by texuser74

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