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In this example, I’m in router mode and if I type the command password cisco

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notice the router is not accepting the command

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because I should be in console 0 mode and not router mode.

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So correct command, wrong mode.

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So I need to go to the line console and then I’ll be able to type the command

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password cisco and the router will accept the command.

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Auto completion of commands is done when you use the tab key,

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you don’t have to autocomplete a command.

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You could simply use the abbreviated command but if you wanna see the full command

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then hit the tab key for the router or switch and auto complete the command.

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So in this example I’m gonna type conf tab, t tab

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notice the auto completion.

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If I type rou I’m only gonna be shown route, so the additional te

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because there are 2 matching values, route map and router.

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So if I type the r tab notice the space is added

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and now I can specify the routing protocol.

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So let’s choose o for OSPF, it's not accepted because I have odr in OSPF

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so I'm going to say OS tab and now notice I get OSPF and question mark

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multiple options, so tab doesn’t work, any t tab does work because

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I now have a unique value, tab wouldn’t work in this example because

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I have to specify a network value and the router wouldn’t know what that network is

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but if I say a at this point, it knows that, that's area.

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so use tab to autocomplete a command if you want to

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it’s not absolutely required, you could just use abbreviated commands

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so you'll often see that network engineers will just type conf t router

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OSPF 1 network 10.0.0.0 with the mask area 0 and router will accept those commands.

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So to see the running config as an example, just type sh run

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don’t type the full show running config command options

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abbreviated command, will save you a lot of time in the real world.

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There's also a command history buffer which allows you to re-enter commands

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that you type earlier, so if I type show history I can see a list of commands in this mode.

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Go to global config mode, press up key

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notice different commands are available in this mode.

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So I can see the various commands that I use there

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So just to show you the key sequence options, show history

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shows me the commands in this mode, ctrl-p, ctrl-p, ctrl-p

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and I'll do up key, notice it’s cycling through the various commands that I typed

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now do Ctrl-n, Ctrl-n, down key, down arrow key

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notice its cycling back through the history.

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So up or down keys, take me through the history in different directions.

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You can also use ctrl-p for the previous command or ctrl-n for the next command

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in some cases you would have to use that

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if the keyboard or terminal doesn’t recognize the up and down arrow keys.

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Don’t forget some of the shortcut commands available to you

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so Ctrl-a takes me to the beginning of the line.

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In this case delete is not being accepted

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so I can use Ctrl-d for deletion of a character

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so that’s a good example, let me type a command, this is a test

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backspace, get rid of characters as you would expect.

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This is a test Ctrl-a takes me to the beginning.

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In my example the delete key is not accepted on this keyboard

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so I can press the Ctrl-d to delete a key.

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ctrl-e takes me to the end of the line

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so here’s the en Ctrl-a  beginning of line

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so Ctrl-a  to the beginning, Ctrl-e to the end.

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Left arrow key takes me to the left one character, right arrow to the right one character.

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there are a lot of other shortcuts in the CLI

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here I’m doing Ctrl-b take me to the left one character

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Ctrl-f forward 1 character which you would need to use

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if for example the keyboard didn’t support left and right arrow keys.

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Those are the basic commands, there are many other shortcuts that you can use

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refer to the Cisco documentation for more information

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but those are enough to get you started and if you’ve got access to our labs

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we'll look at more options and you can tests this on real equipment.