1) How do you know for sure that the program is getting
executed?
2) What user is the script running as? Does it have the
correct permissions?
3) With that in mind, you should be checking the return
of open (always check the returns of system calls!):
open (MAIL, ">/home/brian/mail.txt")
or die "Can't open: $!";
print MAIL "\n";
while (<STDIN>) {print MAIL $_}
close MAIL
or die "Can't close: $!"
Is the file ever created, even? Is anything ever written
to it?
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