Which command shows all supplementary groups for a user?

Which command shows all supplementary groups for a user?

• A. whoami
• B. groups cflynn
• C. id cflynn
• D. ls -l /home/cflynn

Answer: (B)

To see what groups a user belongs to, use the groups command followed by the username. This prints the names of all groups that user is a member of, which includes the primary group and any supplementary groups they’ve been added to. So, running groups with the username shows all the groups for that user, directly answering the question about their supplementary memberships. For comparison, whoami only prints the current user’s name, id shows UID, GID, and all group memberships (giving more detail than just the list), and listing a directory has no relevance to group memberships.

To see what groups a user belongs to, use the groups command followed by the username. This prints the names of all groups that user is a member of, which includes the primary group and any supplementary groups they’ve been added to. So, running groups with the username shows all the groups for that user, directly answering the question about their supplementary memberships.

For comparison, whoami only prints the current user’s name, id shows UID, GID, and all group memberships (giving more detail than just the list), and listing a directory has no relevance to group memberships.