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We've covered the kernel's
major responsibilities.
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Now, let's discuss
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the final major aspect
of an operating system,
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how humans interact with it.
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This is what we
call the userspace.
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When we interact with
an operating system,
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we want to do certain functions
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like creating files and folders,
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open applications, and deleting
items, you get the idea.
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There are two ways that we
can interact with our OS.
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With a shell or graphical
user interface.
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There are also some shells that
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use graphical user interfaces,
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but we'll work with a
Command Line Interface
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or CLI shell.
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For the most part, this just
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means that we'll
use text commands.
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A Graphical User Interface or
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GUI is a visual way to
interact with the computer.
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We use our mouse
to click and drag,
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to open folders, etc.
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We can see everything
we do with it.
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You probably use a GUI every
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day without realizing
you're using one.
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To watch this video,
you probably used
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GUI clicking icons and
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navigating menus to open
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your web browser and
navigate to the website.
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People usually
recognize a device
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or product based on its GUI.
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You might be able to
spot the difference
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between a computer running
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Microsoft Windows or Mac
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OS based on the design
of the windows, menus,
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and icons, you've probably
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seen GUI's and other places too,
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like mobile phones and tablets,
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ATM machines, and
airport kiosks.
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A shell is basically a
program that interprets
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text commands and sends
them to the OS to execute.
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Before we had fancy
visual interfaces,
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commands like create a
file had to be typed out.
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While we have GUI is today,
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the shell is still commonly
used to run commands,
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especially by power users.
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Power users are above
average computer users.
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Linux, especially, it's
essential that you
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actually know commands,
not just a GUI.
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This is because most of them
Linux machines you interact
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with in IT support will
be accessed remotely.
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Most of the time, you
won't be given a GUI.
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There are lots of different
types of shells.
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Some have different features,
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some handled performance
differently.
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It's the same concept behind
different operating systems.
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For our purposes,
we'll just be using
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the most common shell,
Bash or bourne.
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Again, shell in Linux,
you might be thinking,
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but it's easier for me
to navigate a GUI than
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it is to use commands
to do the same thing.
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Why would I want to learn both?
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I can't stress this enough.
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It's vital for you
to know how to use
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a shell in an IT support role.
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Some tests can only be
completed through commands.
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In more advanced IT roles,
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you might have to manage
thousands of machines.
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You don't want to have to click
a button or drag a window
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on every machine when you
can just run a command once.
5308
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