TestOut Linux Pro Practice Test

To verify group membership for a user, which command is appropriate?

1. groups username

2. id username

3. listgroups username

4. showgroups username

The correct answer is: groups username

The command to verify group membership for a user is accurately represented by the choice that includes "groups username." This command displays a list of all the groups that the specified user belongs to, providing clear and concise information about the user's group memberships. When executed, it returns the username followed by the names of all groups associated with that user. This is particularly useful for system administrators and users who need to check whether specific permissions or access controls apply to that user, as group memberships often determine the level of access a user has in various parts of the system. The other options do not function correctly for checking group membership. The command "id username," while it provides related information (showing user ID, primary group ID, and all groups), is not as straightforward for simply listing groups as the "groups" command. The choices "listgroups username" and "showgroups username" are not valid commands in Linux and would yield errors if entered in a terminal. Therefore, the most direct and appropriate command for verifying user group membership is indeed "groups username."