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- So the Bash Shell is

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offering many different features.

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Let's explore some others

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like alias, for instance.

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Alias allows you to
define your own commands.

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Normally these aliases are made permanent

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through one of the Bash startup files

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like /etc/profile.

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I'll talk about these
Bash startup files later,

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but first I want to show you alias.

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So let me type alias.

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That is showing me all aliases

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that have been provided by the system,

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including, for instance, grep.

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Grep is grep, minus minus color is auto.

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That makes a grep

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showing us these wonderful colors.

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Now, if I want to, I create my own alias.

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Alias sander is ls minus l.

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Does that make sense?

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I'm not sure,

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but what I am sure about is that right now

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I have a command with the name sander.

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Aliases behave as best internal commands.

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They become a part of the best shell

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and that makes that aliases
are very, very fast.

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And if you want to configure your aliases

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in a persistent way,
then you should put them

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in one of your best startup files.

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Now let me use unalias.

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That's the counterpart.

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If I use unalias sander

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I have just removed the alias sander.

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As you can see it, no longer exists.

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Now there's some more nice best features

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that I wanna talk about.

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In Bash you will also find a couple

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of useful keyboard shortcuts.

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We have already seen a couple of them

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and some of them we have not.

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Control-l is for clear screen.

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You can type clear but
Control-l is so much easier.

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Or control-u which is allowing you

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to wipe the current command line.

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You just typed this lengthy command

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and then you realize, "Oh,
I don't wanna do this."

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Control-u and it disappears.

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Control-a moves your cursor
to the beginning of the line.

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And Control-e moves it
to the end of the line.

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Control-c is a generic interrupt

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to the current process.

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It will break it,

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which means that it
will basically stop it.

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And if Control-c doesn't work,

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try Control-d.

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Control-d is a generic exit command

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that might also get you
out of the situation

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where you are in right now.