A system administrator needs to verify all the group memberships for a user account named testuser. The desired output is a simple, space-separated list containing only the names of all groups testuser is a member of. Which of the following commands will produce this specific format?
The correct command is id -Gn testuser. The id command displays user and group information. The -G option specifically prints all group IDs. The -n option, when used in conjunction with -G, modifies the output to show the group names instead of the numeric IDs, which directly meets the requirements. The groups testuser command provides similar information, but its output format is testuser : group1 group2 ..., which is not what was requested. The id -G testuser command would only display the numeric GIDs. The getent passwd testuser command retrieves the user's entry from the password database, showing details like UID, primary GID, home directory, and shell, not a list of group names.
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What is the purpose of the 'id' command in Linux?
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What is the difference between 'id -Gn' and 'id -G'?
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How does the 'groups' command differ from 'id -Gn'?
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