For more information about linux User management commands-general Linux technology-Linux technology and application, see the following. Id username: displays the user id, group id, and user group id.
Who displays users logging on to the system
WWho's enhanced command displays the users logging on to the system, what they are doing, and how their processors are used. It is a common security command.
Finger username: displays the user's system information
Last display of users who recently logged on to the system, often used as a means of system security detection
Lastb shows recent unsuccessful login attempts
Free display of system memory information
More/proc/filesystems displays information about the file system currently in use
Setup uses the root user to configure the mouse, sound card, keyboard, system service, etc.
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