The Cisco IOS commands allow the user to enter partial Cisco IOS commands. If you start to type in a command it can recognize it and finish the command for you.
Cisco IOS uses a command line interface (CLI) for inputting commands when configuring Cisco Routers
Cisco IOS uses a command line interface (CLI) for inputting commands when configuring Cisco Routers
The question mark. It can be used in different contexts, for example: ? (list all commands that make sense in the current context) s? (list all commands that start with s) show ? (list what options you have as the second word after the SHOW command, for example, show ip, show running-config, etc.)
show interface status
Divide and conquer
show?
config tftp run
show ip eigrp neighborsw
debug all
flash, NVRAM, TFTP server
Router(config-if)#no frame-relay lmi-type cisco