Multiple users sharing home
add a group in common that should be used as primary group
groupadd groupname
add each user pointing to the new home (the first one will create the folder) and stablish the created group as primary group
useradd -c "gecos" -d /home/homename -g groupname-m -s /bin/bash username1
useradd -c " gecos" -d /home/homename -g groupname-m -s /bin/bash username2
Edit their .bash_profile and set their umask to g=rwx.
umask 0002
change the permissions of the home directory recursively so the primary group have full access
chmod -R 770 /home/homename
