BUG: Don't fail if wheel exists

[khalford]

As we have used set -e the script will fail on any error. This is safe and good practice but groupadd wheel normally fails as the group already exists. By adding the or operator || we can bypass the set -e and allow the script to continue.

[jose-caballero]

If you don't want to print out messages (one of the UNIX rules is not to printout unless really needed), there is an alternative:

   groupadd wheel > /dev/null || true

or maybe check first if the group exists

  getent group wheel >/dev/null || groupadd wheel

Up to you

[khalford]

If you don't want to print out messages (one of the UNIX rules is not to printout unless really needed), there is an alternative:

   groupadd wheel > /dev/null || true

or maybe check first if the group exists

  getent group wheel >/dev/null || groupadd wheel

Up to you

I will do that