the file /etc/group will contain the group information

groupadd assigns the group ID automatically which is graeater than id of other groups.we can create id s using the -g or -gid

the groupid must be unique and non negative .-o option allows to create duplicate or non unique ids.

by using -r or --system we can create system group the group id are between 100 to 999

--f or -- force option forces groupadd command to exit status if the group already exists

-p or --password allows groupadd command to specfy the encrypted password to the group

- k option is used to specify the group id between the given specified limits 

Explanation:
Creates a group named developers.

Creates a group named testers with the GID 1050.

Creates a system group named sysadmins (system groups have GIDs below 1000).

developers:x:1001:

Explanation:
Checks if the developers group exists in the system.

Explanation:
Displays all existing groups and their details.

Explanation:
Adds the user alice to the developers group.

Explanation:
Adds user bob to developers, testers, and sysadmins groups.

Explanation:
Deletes the testers group.

Explanation:
Changes the GID of the developers group to 2000.

Explanation:
Renames the developers group to eng_team.

Creates a new user group.