lid

List groups for a user

$ sudo lid username

$ sudo lid --group groupname

lid [options] [name]

lid displays a user's groups or a group's users. It reads from the system's user and group databases to show membership information.

-g, --group

Treat the argument as a group name and list its members

User or group name to query (user by default)

Requires root privileges to access all group membership information. Without arguments, shows groups for the current user.

lid is part of the libuser library tools, providing user and group account management utilities.

groups(1), id(1), getent(1)