in reply to Re^4: Linux::usermod - user name ... already exists
in thread Linux::usermod - user name ... already exists

If you don't need the output, use system instead of qx. It returns the exit code directly, so no need to use $?.
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In Section Seekers of Perl Wisdom