Create groups and add users to groups

create a new group
pw groupadd ic_common_git pw groupshow ic_common_git

add a list of members to the group
pw groupmod ic_common_git -M amou pw groupshow ic_common_git

add a new member to the group
pw groupmod ic_common_git -m rber pw groupshow ic_common_git

use id to determine group membership
id amou id rber

owner is amou group is ic_common_git
chown -R amou:ic_common_git ic_common.git

allow members of the group also write access
chmod -R 775 ic_common.git