USING IOS CONTENT SENSITIVE HELP

Using IOS content sensitive help (?)

The "?" provides context sensitive help, it provides the command syntax or the commands supported in the various lOS modes.

Example 1:

Router>?

Exec commands:

<1-99>                Session number to resume

  Connect             Open a terminal connection

  Disable              Turn off privileged commands

  Disconnect         Disconnect an existing network connection

  Enable               Turn on privileged commands

  exit                   Exit from the EXEC

  logout               Exit from the EXEC

  ping                  Send echo messages

  resume              Resume an active network connection

  show                 Show running system information

  ssh                   Open a secure shell client connection

  telnet               Open a telnet connection

  terminal            Set terminal line parameters

  traceroute         Trace route to destination

--- More ---

Example 2:

Router(config)#interface ?

Ethernet                   IEEE 802.3

 FastEthernet           FastEthernet IEEE 802.3

 GigabitEthernet      GigabitEthernet IEEE 802.3z

 Loopback               Loopback interface

Multilink                 Multilink-group interface

Null                       Null interface

 Serial                   Serial

 Tunnel                  Tunnel interface

 Vlan                     Catalyst Vlans

 Range                  Interface range command

Similarly the context sensitive help can be used in all IOS modes and Commands.

            Command Line editing:

·         Tab        -> for command completion

·         Ctrl + a  -> to beginning of the command

·         Ctrl + e  -> to end of the command

·         Esc + b  -> back by one word

·         Esc + f  -> forward by one word

Wrong Command notification:

Router#comfigure termainal

                 ^

% Invalid input detected at '^' marker.

Router#

Note: Command line error occur primarily from typing mistakes