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Learn to customize commands at the Linux command line.
Videos can also be accessed from the Linux Essentials Playlist on YouTube.
Linux alias Command Summary with Examples (3:38)
Our twelth word, or command to memorize is
alias from the category System.
alias allows you to customize a
command. Recall from our last video that alias is a command type, and
here we'll learn more.
||Print aliases in a reusable form|
Before we start, it helps to think of commands as mini programs and
most follow this structure:
command -option(s) argument(s).
alias command has
1 option, and arguments you provide will either list,
or create the alias.
-p option will print aliases in a
reusable form in case you want to create a file for a bunch of aliases.
So why is
alias an important command?
alias will help you customize
your system, and save you keystrokes.
And now you know how to do that.
Okay, the best way to embed this in your memory is by typing in your own terminal window.
Find this on your Mac using a program called Terminal. On Linux use Terminal or Konsole, and currently Microsoft is adding this functionality to Windows.
Here we go, type
alias without options
And look, one for the command from video 7,
ls. To interpret, when
ls is run, Linux runs text inside the
quotes, and this sets the output colors.
Next, let's say we prefer to view
in one column instead of several, but since this requires three extra
keystrokes, space-dash-1, we could edit this alias, by adding the
-1. Saving, viewing and giving
it a go.
Now, we could create a new alias that also reminds us of the current
directory. Pick a new name, lsd, and make sure it isn't taken by using
Good. It's free. Up-arrow to recycle, add a semi-colon, the pwd
command, enter, and test
Okay now you know how to use
And you know the syntax for commands, options and arguments.
One last tip about the
Aliases expire each session unless saved in user configuration files,
so I'll introduce users next.
Okay, thanks for visiting today. I hope this was a fun introduction
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