try `find /home/sites/$arg1/users -type d -maxdepth 1`.
this might be the more perlish way...
my $which_site = shift @ARGV or die "Usage: $0 <sitename>\n";
my $home = "/home/sites/$which_site/users";
use Cwd;
my $old_cwd = cwd(); # keep current working directory
chdir $home or die "Can't chdir: $!\n";
opendir(HOME, '.') or die "Can't opendir: $!\n";
my @users = grep
{
!/^\./ # skip any .file_or_dir esp . and ..
and -d # is it a directory?
} readdir(HOME);
closedir(HOME);
# go back to where we started
chdir $old_cwd or die "Can't chdir: $!\n";
print join "\n", @users, '';
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