You have an empty element you want to ignore? How about one of: 
@users = grep { $_ } @users; #eleminate undef elements

[download]
or in your loop either of: 
next unless $user; #after the chomp (which could be done on the whole 
+array outside the loop
print $user . '.mydomain.com' if $user;

[download]

In reply to Re: undef line in an array by voyager
in thread undef line in an array by Dalin

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