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[No audio]

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We're going to compare two files, how that is done?

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There are two very basic commands

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that are used in Linux.

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First one is the diff which is going

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to compare two files line by line.

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And the second one is cmp, compare

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and it does byte by byte.

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We're going to look at these two

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commands by logging into our system.

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We'll use a PuTTY session.

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And if you remember, for the PuTTY session, we

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would need the IP address of our machine.

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If you don't remember the IP address, you could

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go back into your console,

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you log in,

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[No audio]

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and you do,

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you do ifconfig, pipe it more because we

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don't want to see the information going too fast.

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So I'm piping it to more, and

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you'll see the IP addresses right here.

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You could put that IP address in your PuTTY,

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and you will be able to connect to it.

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So let's minimize this and let's see who we are.

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Sorry, whoami, which directory I'm in?

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I'm in home.

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Do what's inside my directory.

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I want to go into the directory

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superman, and see what's inside in superman.

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I have,

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I want to remove this file I created earlier.

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So this way it will be easier

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for you to understand and recreate it.

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So I'll remove it.

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So,

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okay, so I am in this directory home,

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I have also superman, and I want you

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to create a file called superman-characters.

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So let's do touch, sorry, not touch, echo,

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and the first character, clark kent

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and put it into superman-characters.

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Verify it's there.

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Yes, it's there.

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And then echo,

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[No audio]

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lois lane,

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double superman-characters,

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echo, and General Zod,

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superman-characters. Let's do cat,

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and you'll see it has three lines,

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clark, lois lane, and General Zod.

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I want you to create another

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file, call it superman-characters2.

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So up arrow key, go back to your first file, and this

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time I want you to do same thing, and do character2.

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Hit enter, then you will do the same thing.

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General Zod, 2.

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[No audio]

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Now, I know it was lois lane. Yes.

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So lois lane, character2, and

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the last one is General Zod.

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But this time I don't want you to do General Zod,

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I want you to do General Peter, and enter.

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Let's check the superman-characters2.

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Okay, you see the superman-characters2 has General,

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Peter, and the superman-characters has General Zod.

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Now let's do comparison.

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If you want to compare two

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files, we'll do the first one,

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we do diff and superman-characters

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with superman-characters2.

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It's going to tell you the first file right here has

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the General Zod on it and second one has General Peter.

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Now what if I compare it, superman-characters, superman-characters2. Again,

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you could do just tab and autocomplete and

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it'll tell you the last 3 lines, the

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30 bytes, and that's about the difference.

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So that's about the two commands that we

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use in Linux to compare two files.

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There is not an easy way

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to compare two files in Windows.

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So that's why again, this gives us a huge

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advantage to do file text manipulation in Linux.

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Again, I want you to do man

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command on both commands and cmp and

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just learn different options that are available.

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[No audio]