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Finding files and directories. Oftentimes system

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administrators or system engineers or technicians,

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whoever the user of Linux is, they forget where

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files are located. Just like in Windows, when you

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want to find out find a file, you are given a

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little search box at the top of the window, and

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you type in the search and looks for its file. It

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takes a very long time, of course, in Windows, but

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in Linux, it's a lot faster and a lot easier. So

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there are two main commands that are used to find

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files and directories in your system. And the

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reason you need to find it, if you remember, I

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gave you an example of our closet. You go into our

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closet, you want to find a shirt that you haven't

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been worn for a long time and you don't know where

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you have it, which drawer or which shelf. You do need

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to have tools to look for those files, and those

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tools in Linux or find and locate. So we're going

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to use those commands in our Linux

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environment and do some exercises and see how they work.

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[No audio]

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So here we have our Linux machine, and let's find

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out where we are. We are in our home directory.

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And in our home directory we have files, different

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files and different directory. I wanted to go into

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seinfeld directory, and I want to see what's

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inside of it. Inside of it, there are different

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files called kramer, george, jerry, puddy, seinfeld-characters,

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all those different parts. Now what if

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you go back one step and you are in home

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directory, and here you thought that you

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created a file called kramer in this home

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directory but when you come in here, you don't see

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it. So you could either go into each directory one

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by one, do ls command and find it which is very

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cumbersome. You don't want to do it. So you could

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find it by the command find. The syntax

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of the command is find, and where do you want

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to find it. You could give a relative path which is

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dot which means in this current directory, start

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the search from this current directory, and this

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current directory is home/iafzal, so find dot

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dash name space "kramer", and

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you hit enter. It's going to tell you that the

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kramer file is inside of seinfeld directory and

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it's in there starting from this current

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directory. So this current directory has seinfeld

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directory, yes, of course. And now I know I created

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that kramer file in seinfeld. Okay, perfect.

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locate command works the same way. So you are in

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your home directory and you want to locate kramer

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This is telling you exactly where that file is.

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[No audio]

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find command is used sometimes to look for files

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in a very hierarchical way where you have tons of

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different directory, where locate is going to find

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you in a short searches. So if you want to find

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where, let's say our network file is where it's

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located. So if you see find slash because you want

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to find that network file from the root of the

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file system, because you don't know where that

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file is starting from which directory, so you will

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always start with root space dash name, comma "ifcfg"

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dash, and what is our interface. We don't know

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our interface so we'll just Ctrl C and we'll do ifconfig,

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and our interface enp0s3. So

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find slash name ifcfg, this is the

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file name of our interface, which we will cover by

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the way later. And we want to find it now we are

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getting all the Permission denied. Whoa, whoa,

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whoa, whoa. Okay okay, relax, relax. Why are

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we getting permission denied? Why didn't it find it?

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Hmm. Okay, I know why. And I'm sure you guys know

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why too, because you do not have permissions to go

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into certain directories. So, why because you are

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iafzal and who have permission to go into

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different directories. Tell me, root, yes, root has

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it. So you do su root, to become root, put in

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the password. Now you run that command find

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slash, from the beginning ifcfg dash enp, I

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always forget that, sorry. Okay, so find slash

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name, and ifcfg-enp0s3.

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And now I'm going to run it. Now it's going

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to go into every directory and look for it. The

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first one is just a run directory. I suppose this

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is just the process itself. So don't worry about

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it, you can ignore it. Second one, you'll see it

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found it. It is telling me this file that you're

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looking for is in /etc/sysconfig/network-scripts/ifcfg-enp0s3.

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If someone asks you, where is that file located as if

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it's in just a general question, or if it's an

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interview question, you know, the best way to

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answer it is I will run my find command or locate

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command to find where the file is located. So

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practice those two commands, run man on these

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commands, and look for different options that you

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could use for these commands and see how easy it

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could become for you.

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[No audio]