At this point, we are about ready to use the command line.
Let's talk about a couple of command line essentials.
First thing to realize is that Linux is case sensitive.
So if you see lowercase, you type lowercase because if you type uppercase it won't work.
Also, you should realize that there is an exception to any generic statement on Linux.
Linux is open source, and because of the decentralized development of different Linux
components, there are always exceptions to things that you consider to be true.
Let's use an example of how to quit an interactive interface. Sometimes you need
control C, sometimes you need Q, sometimes you need to type quit. It all
depends on the discretion of the open source developer behind the project.
Now, while you are working with commands, commands are often used with options.
And these options can be specified as long options.
And long options start with double hyphen. So Uname
Help is printing help for the Uname command.
There's also short options, and short options start with a single hyphen and they can be
defined. So instead of using LS l r minus T, you can also type LS lrt.
Linux commands typically have many options.
If you want to know about these many options, you use Help on any command to learn how to use it.
Let me show you.
Let's use the LS command as an example. If I type ls, then it works. If I
type LS in uppercase, then I'm getting command not found. But fortunately my shell is friendly enough
to tell me that it knows about similar commands, which is LS in all lowercase.
Now how about these options?
LS Help is giving me a list of all of the options and oh my goodness, that doesn't fit on the screen now does it?
If I scroll up a little bit, I can see all these options and as you can see, it's an entire Alphabet.
Now if you look at the l option, there we go. L uses a long
listing format, and it's kind of funny, L only exists as a short option.
There are also options like k for kibibytes that exist
as a short option as well as a long option.
So LS l K will show you kibibytes for all of the valves,
but you can also use LS l kibibytes to show the kibibytes value.
For now, I think that's enough.
Let's explore some more commands in the next couple of.