groupadd

Create a new group

$ sudo groupadd group_name

$ sudo groupadd -r group_name

$ sudo groupadd -g 1001 group_name

$ sudo groupadd -U user1,user2 group_name

groupadd [options] NEWGROUP

groupadd creates a new group account on the system. It records the new group information in system files (/etc/group and /etc/gshadow), assigning a unique GID unless specified.
System groups (created with -r) use GIDs from the system range defined in /etc/login.defs, typically below 1000.

-f, --force

Exit successfully if group exists; use next available GID if specified one is taken

Set numerical group ID (must be unique unless -o used)

Override /etc/login.defs defaults

Allow creation with duplicate GID

Set encrypted group password

Create a system group

Add users as group members

Apply changes in chroot environment

Apply changes in prefix directory

Group names must be 32 characters maximum and cannot start with dash, plus, or tilde. Names cannot contain colons, commas, whitespace, or be entirely numeric.

groupadd is part of the shadow-utils package for managing group accounts on Unix-like systems.

groupdel(8), groupmod(8), gpasswd(1), useradd(8)