add a new user: adduser username
show group of current user: groups
show group of specific user: groups username
show all groups on system: cat /etc/group
list users on system: cat /etc/passwd
change password: passwd username
delete user: deluser username
delete group: groupdel groupname
add user to a group: adduser username groupname
remove user from a group: deluser username groupname
add user to the sudo group: adduser username sudo
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