in reply to read files one by one in directory and redirct output to a file
"If you're planning to filetest the return values out of a readdir, you'd better prepend the directory in question. Otherwise, because we didn't chdir there, it would have been testing the wrong file."
http://perldoc.perl.org/functions/readdir.html
Ditto for opening for read/write
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In Section
Seekers of Perl Wisdom