What does the 'su' command accomplish in Linux?

The 'su' command in Linux is primarily used to switch the current user to another user account, which is reflected in the selection of "Change user." When executed without any additional arguments, 'su' defaults to switching to the root user, which is the administrative account in Linux systems. This provides the invoking user with the root privileges necessary to perform administrative tasks.

The command allows for secure access to another user’s account without needing to log out of the current session, enabling administrators to perform tasks that require elevated privileges or access to different user environments. Furthermore, the 'su' command also allows for specifying a particular user, enabling flexibility in user account switching.

Although other options may seem related to user management or permissions, they do not accurately describe the functionality of the 'su' command. For example, displaying current user permissions pertains to commands like 'whoami' or 'groups', setting filesystem permissions relates to 'chmod', and removing a user relates to 'userdel'. Each of these commands serves a distinct purpose that does not overlap with the capability of changing the user context provided by 'su'.