What command would you use to change the group ownership of a file?

The command used to change the group ownership of a file is indeed specific and is typically referred to as chgrp. This command allows a user to set the group associated with a file or directory, thereby granting permissions associated with that group to the appropriate users.

When employing chgrp, you specify the new group followed by the file or directory name, which makes it straightforward to manage file access across different user groups.

Understanding that group permissions can be critical in a multi-user environment, chgrp enables file management that adheres to the principle of least privilege. This is particularly important in collaborative settings, where users need to access shared resources without compromising security.

The other commands mentioned have different functionalities: chmod is used to change the permission (mode) of a file, chown is used to change both user and group ownership, and setgrp is not a standard command in Linux for changing group ownership. Hence, chgrp specifically serves the purpose of modifying just the group ownership.