Since you have no numbers next to the lines, we have to guess. I suspect

$user = $file;
[download]

to be the culprit, since you just clobber the $user variable whose value you just read from STDIN and carefully chomped, with an undefined value: the my $file above is defined only for the foreach context. use strict would catch that. And so,

chdir("$hdir/$user") || die "Cant Change to directory $hdir/$user: $!\
+n";
[download]

causes the the warning to be thrown. Where's $hdir defined?

Anyways, that should be

my $number = <STDIN>;
chomp $number;
die "Invalid selection\n"    if $number =~ /\D/;
die "Number given too big\n" if $number > scalar(@ulist);
my $user = $ulist[$number];

chdir("$hdir/$user") || die "Cant Change to directory $hdir/$user: $!\
+n";
[download]

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