in reply to If File Exists

Try: 
if (-e "$ENV{REMOTE_ADDR}.$ENV{HTTP_COOKIE}.txt") {
    do something if file exists
    }
else {
    file does not exist
    }

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POTENTIAL SECURITY HOLE
by merlyn (Sage) on Jun 19, 2000 at 17:56 UTC
    No. Don't use anything starting with HTTP_ directly in any file path. This is an arbitrary string coming from the browser, and can be manipulated directly by a person with ill intentions.

    -- Randal L. Schwartz, Perl hacker

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In Section Seekers of Perl Wisdom