10.4.3 “man” Command – Get Help on Commands
Most of the commands used in Linux can perform a variety of functions in a single command. In order to correctly execute these various functions provided by a specific command, the command must be input in various formats. Also, the execution result of the command is displayed in various types and various forms. In reality, for each command, we can hardly remember all necessary knowledge about what functions the command can do, and how to instruct the command, and how to understand the outcome of the execution.
So Linux provides detailed help for each command. With the help, users can search various informations that they can not remember when they need it, and solve the problem. The “man” command is used in this case.