Linux/Mac Terminal Tutorial: The Grep Command - Search Files and Directories for Patterns of Text

In this Linux/Mac terminal tutorial, we will be learning how to use the grep command. The grep command allows us to search files and directories for patterns of text. You can also pipe the output of one command into grep to get certain matches. It’s extremely useful once you learn the ins and outs. Let’s get started…

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20 Comments

PraiseHymnProject

April 16, 2020

Such a useful and straight forward video! Awesome!

Reply

Matt Dooley

I have this issue, can anyone help me? So, I sam searching for the word "Christmas" in a text file by doing the following:
grep "Christmas" filename.txt
And I got back the entire text of the file, printed out entirely in terminal! Unlike the video above, where simply got the number of the lines where the word appears, which is what I want for "Christmas" in my text file. What am I doing wrong?

Brendan Metcalfe

Thanks!

Mathew Boyd

I am very new to bash and was wondering how you go back to the previous command once you run it. For Ex 1:50

ramkiran55 devireddy

grep -i "John Willims" names.txt
How can I pass a string variable instead of "John Williams"

Maxwell Wibert

Unfortunately, it looks like homebrew has deprecated the –with-default-names option since the making of this video. Now in order to set gnugrep as the default grep you have to do some strange path manipulation in your bashrc/zshrc file. I don't fully understand how to do this, and was wondering if you might be able to explain the new method. I think you have to add a path to your gnubin in your rc file?

Sana Ali

Thank you for this very amazing and concise tutorial. You have summarized everything perfectly! Does . and ./* mean the same thing if I do grep r?

insanecbrotha

lol, the BRE for the phone numbers would be: grep "([[:digit:]]{3}-){2}[[:digit:]]{4}" names.txt

Could be worse though: http://ergoemacs.org/misc/emacs_lisp_toothpick_syndrome.html

camelCase

Which font do you use in the terminal?

Vineet gupta

Could you please make video on DS by python

Ian Hopper

Corey is simply the best.

MD Hossain

I like that this guy just gets straight to the point and wastes no time. I like this man already!

o

how grep "function" in php files that resides on remote server or localhost?

George Ford

FYI – the "–with-default-names" option has been removed. For Mac users who still want to use GNU grep as grep, see this helpful link: https://stackoverflow.com/questions/59232089/how-to-install-gnu-grep-on-mac-os

Mickaël Riga

Great video ! Great explanation. I like that it goes beyond the basic use. Thank you for sharing.

B R Pawan Kumar Iyengar

Great video … thank you

CrushOfSiel

So glad I looked at this tutorial. I've known how to kind of use grep for a while. Some of these options are going to be super helpful to me in the near future. I should have looked in the man pages a long time ago!

Khuen Lau

Thanks for creating this video, have been searching on how bash commands filter text files, can't find anything helpful, glad I searched it on Youtube.

mehmet rasim inceoglu

This was very informative. Thank you for the video.

Dielle

You should make an awk tutorial!