【原】The Linux Command Line - Workiing with commands

● type – Indicate how a command name is interpreted
● which – Display which executable program will be executed
● help – Get help for shell builtins
● man – Display a command's manual page
● apropos – Display a list of appropriate commands
● info – Display a command's info entry
● whatis – Display a very brief description of a command
● alias – Create an alias for a command