gpasswd

Administer `/etc/group` and `/etc/gshadow`.

• Define group administrators:

sudo gpasswd -A {user1,user2} {group}

• Set the list of group members:

sudo gpasswd -M {user1,user2} {group}

• Create a password for the named group:

gpasswd {group}

• Add a user to the named group:

gpasswd -a {user} {group}

• Remove a user from the named group:

gpasswd -d {user} {group}

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