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I have used these for my master domain Thaigaming.com

Add user

useradd [-c comment] [-d home_dir]

[-e expire_date] [-f inactive_time]
[-g initial_group] [-G group[,...]]
[-m [-k skeleton_dir] | -M] [-n] [-o] [-p passwd] [-r]
[-s shell] [-u uid] login

useradd -D [-g default_group] [-b default_home]

[-e default_expire_date] [-f default_inactive]
[-s default_shell]