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secondary group

Ubuntu Linux: Add a User To Group

How do I add a user to group under Ubuntu Linux operating system using command line options?
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Linux: Find Out My Group Name [ Group Memberships ]

How do I find out the group name under Linux operating systems using bash shell prompt? How do I display group information for the specified USERNAME under Linux?
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FreeBSD add a user to group

Q. How do I add a user to group under FreeBSD operating system?

A. You need to use pw command. The pw utility is a command-line based editor for the system user and group files, allowing the superuser an easy to use and standardized way of adding, modifying and removing users and groups. First login as the root using su or sudo command.

Task: Add existing user to group

You would like to add existing user tom to secondary group called ftpusers. Type the command as follows:
# pw usermod tom -G ftpusers

You can add tom to secondary group ftpuser and wwwusers:
# pw usermod tom -G ftpusers,wwwusers

-G option Set the default groups in which new users are granted membership. This is a separate set of groups from the primary group, and you should avoid nominating the same group as both primary and extra groups.

Task: Add a new user to group

Add new user jerry to system and to secondary group sales:
# pw useradd jerry -G sales
# passwd jerry

First command adds user jerry to secondary group called sales. Second commands set a password for jerry.

Further readings:

=>Read pw command man page.