Linux Crash Course - The grep Command
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- čas přidán 29. 06. 2024
- The "Linux Crash Course" series (formerly known as the "Linux Essentials" series) tackles important concepts around Linux, one video at a time. In this video, Jay goes over the basics of the grep command, along with some useful examples.
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Time Codes
00:00 - Intro
00:38 - Check out Linode and get your very own Linux server!
01:58 - What is "grep"?
03:12 - Piping the cat command into grep
03:58 - How to omit a search string
04:49 - Running grep by itself
05:32 - Using grep against a sample file
07:33 - Showing line numbers with results
08:00 - Additional options with the grep command
10:06 - Using grep against multiple files
10:55 - Recursive search with grep
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#Linux #LinuxTutorial #grep - Věda a technologie
Love these series Jay, thanks very much.
What I really appreciate in your videos is, that you explain the meaning/naming of options in the commands. For example "-r" for "recursive" ,or "-i" for "insensitive". This helps very much to memorize these options, because they are endless when it comes to shell commands ;-) Keep up your great work Jay, thanks.
I´d love to see a episode on advanced grep use-cases. I´m often supprised how powerful and useful this little application is.
Jay, next week do "How to do your taxes with the 'find' command!" 😁 'find' has soooo many options that it probably requires 3-4 videos...
Often the reason people use the format "cat file.txt | grep term" is because they want to search for multiple terms separately. I can can tap the up arrow to get the previous command then easily change "term" since it's at the end of the command where the cursor will be. For a command in a bash file, I would use "grep term file.txt" to keep it shorter.
Hello Jay
only to say thank you so much for this video
i'll watch it like a good dozen of times
you actually realized an old dream that even books wasn't able to make possible
Stay blessed and I stay tuned
Needed a refresher and this was a great/concise overview
great video and great content. production was there and I am excited to keep using your short and specific videos to help me further my understanding of terminal thank you for doing this.
Thanks Jay. I never looked at the man page because I tend to use find, but you explained it very clearly. Grep demystified! I'll be using it a lot more now.
Thank you for this! I didn't need to take notes because your way of teaching made it so easy to learn and remember for future application.
I also use -l to list only the filenames which contain the search term. and also zgrep for when the files are compressed. Great video!
And pgrep to look at processes...
your videos are super helpful, I appreciate your work.
Excellent tutorial! I've only used `grep` by looking up examples, but now I'll try and use it from scratch like your examples. This video was well formatted and informative, thank you.
I usually run one terminal with what I’m doing and another with the -h dialogue or the man pages. Grep -h or man grep
THAT IS A INCREDIBLE TEACHING WORK, THANK YOU VERY MUCH.
Great video 👏🏻
Corrections for "-c" option.
"-c, --count print only a count of selected lines per FILE.."
So if there are 2 or more occurances in a line, it count as 1.
Thank you.
Super cool, very useful, thank you very much.
Thank you so much this really helped with completing my assignment
Grep is what got me into Unix, it is hands-down my #1 favorite program ever written, I use it for everything! If I hadn't found grep I'd probably still be using Linux like Windows, it opened up a whole world for me.
Good one Jay. Thanks for the detailed examples. The grep -ri is very powerfull and I'll be using it many times...
Do 'which rgrep', and if it exists, it's the equivalent of 'grep -r' without having to do as much typing (yeah, yeah, you're only saving 0.002 seconds, but it's easy to remember, too 😀).
@@d00dEEE
اكيد
Awesome . Thanks man
@11:05 I love it how Jay gets irritated with us asking a rhetorical question. I've seen other video instructors do this too. It must be frustrating after a while making these videos ...labors of love... and why aren't you people getting this!?!?
After using grep the non-optimal way I finally learned how to do better. Thanks for the video.
Good video. Thank You!
Amazing explanation
I use "grep" for a couple of years now and did not know I could use it individually, without pipping it as with "cat", "less" or so...
This command is more powerful than I was thinking =)
This was great.
Thank you very much ….very useful Video
Good video!
Your videos are gem Jay. Thank you.
Thanks a lot !
Jay looks great fashioning that beard. Kudos bro!!
Thanks for sharing
loving the Mr. Rogers Sticker 🙂
awesome video
I started watching your channel a few days ago, and I saw some earlier ones before this one. Funny enough, it seems to me like you look younger now than you used to, I think it's because you used to wear glasses and no beard ^^
Anyway thx for the tips! I'm a big fan of the grep command :)
Your vid’s are awesome! Thanks!!!
i love that samus is now a "bounty hunger". they must really like bounties huh.
you are our super hero thank you
thanks for guide❤
Hey Jay, thanks for the videos. Funny you mentioned the grep command cause today I looked up how to print everything and highlight the results. ifconfig | grep -e "^" -e "192.168". Actually stopped by to see your kubernetes videos. Don't know much about it so looking to learn more. Rocking that beard. 👊👏
Your character list proves we are of the same creed. Hello, brother.
Isn't pipe slows slowing down execution? In case of cat | grep bash should first get contents of the file and then pipe the whole contents to grep.
Perhaps grep would run cat under the hood first though...
The best teacher ever, thank you!
❤ excellent
Thanks
Are you planning to do (or have you done in the past?) an intro to regular expressions? That's where the real power of grep (and several other unix/linux tools) is. Please realize I am not criticizing the lack of regex in this video; introducing the basics of grep is complex enough as it is :)
I love regular expressions, I use them all the time. But I always had trouble when I was teaching, trying to get people to really understand what they do and why they're useful. And the syntax is.... not always obvious, even when you're familiar with it.
This is good series. Although I already know most of these myself ( _not_ a criticism! :) we were all beginners at some point), I have learned a few things along the way, and I think these videos serve as a good introduction to the tools that are available for those just getting started, or who may have avoided the command line in the past.
Don't apologise so much xd
@@senseijohnny3094 can't help it, I'm Canadian 😁
thank you
You got your like ;)
Tutorial starts at 2:00
TY
Great video. I have a question. How do you build this command prompt?
thnx
Jay can we ask for shell-customization video
thank u
Please make one tutorial for configuring coTurn in NextCloud Talk.
Great video - great sponsor too - Linode is what I've been needing for years (sick of PLESK).
Huion (Graphics tablets) don't make Linux drivers.
Kernel hardware support isn't perfect as pen position and where pixels appear on screen are offset.
Offset is rectified by doing
$ xinput
and manually reading the ID when you see a line like...
Tablet Monitor Pen Pen (0)
which is escorted by the tabbed value "id=20"
This id number is used with data from the $ xrandr command
which gives the name of the Graphics tablet. My $ xrandr command gave the tablet the name of "HDMI-1"
Then you do
$ xinput map-to-output 20 HDMI-1
to correct the offset.
Your explanation of grep has moved me one step closer to automating the process
(p.s. the ID number changes when I use a different graphic tablet, 20" or 16") grep will help me make run a script that can read the current 'id' number and the 'name' to automatically run the map command.
Thank you so much Jay. Much appreciated.
Thx so much teaching I.T. and english also lol
nICE FF6 Reference!
Can someone answer this question please? How do you copy and paste the text file from the blog post back into the nano text editor in the Linux command line? Thx
sir I am using redhat in virtual box and i want to connect my windows host machine to redhat ansible. is it possible ??
I have a question, in a folder there are 1000's of files where I need to search for two words which is not in a single sentence but is in a single file. So how can I use the grep command
Can you please analyze this. Question? I am eager to learn. Thank you very much.
For instance, given the following command:
ls --help | grep "dired"
Answer Format:
Look to the logs file and filter the specific string which starts with CTK?
CTK{*****************************************}
I need help. I try to display lines with grep “/page1”.
But in addition to “/page1” it displays “/page10”, “/page12”, “/page16”… etc.
I need “/page1” only. How do I do that?
is there anything which will help me open that file and point to it instead of just printing that given line
??
What I'm trying to figure out is. how do I isolate negative numbers, I've tried
$ grep -e -$ file
But it comes up with nothing.
There're 5 lines with negative numbers that I have to isolate, but I can't figure out how to
Can I use grep to find for a file ?
How to search for whitespace using grep
Terra should be Esper/ Human ;)
grep is a grep.
please fix your pictures in the background they are not equidistant. My disappointment is immeasurable and my day is ruined
Before running any command, you should have shown that file contents and then could have explained by using grep we can extract / filter out this text from this, poor explanation