Grep and Regex - BASH - Linux

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[@JaduSaikia]

useful. I always enjoy your videos, good stuff Kris !

[@no1sploit529]

10 years ago video having lots of great information ❤

[@america0014]

Another great video. I'm loving the bash ones alot. Especially with grep, which is really handy. Tac on the -iRH and it gets pretty sweet too, even though my theory might not be as correct as using the find command with the -exec grep command...but as you said, "There's a thousand ways to do one task in Linux". Thanks Kris for this video...I now can say I have learned something new today!

[@pleabargain]

Regex is so powerful. Thanks for these videos!

[@nasirali-fs3fk]

thank you Kris. i learned alot. god bless you.

[@DigitalMetal]

@crusivol: -r is to do a "recurse" search. If you want to search through files in sub directories.

[@JEANLOIZIN]

cheers mate. keep up the good work.

[@marcoadriancenturion9314]

very usefull, my grand grandma was occhipinti from argentina

[@macky1660]

thank you grep [Kk]ris for the wonderful video, I had 0 knowledge on Regex and this actually gave knowledge on how to use regular expression thank you!

[@DigitalMetal]

Glad it was helpful!

[@russelljenkinsfearn]

Great tutorial, just what I need, thanks One question. There is another line that begins AND ends with kris. Why didn't it find it?

[@tuxsbro]

more regex would be great, thanks for the videos

[@DigitalMetal]

because the ^ says this is the beginning of the line and the $ says this is the end. Meaning, that the content in between has to match the entire line.

[@PranitKothari]

Great video. I am new to Linux world, and quite afraid of command line. But your video says its possible for me too

[@abbadkamel8839]

thank you kris

[@georgigeorgiev2219]

Thank you. GOD bless you.

[@amerikraine3401]

I'm obsessed with ADB, you made a good video that was helpful. Thanks a lot. Email me if you want to ever exchange knowledge

[@vanomel]

@John8pie you are absolutely right!

[@danieljoldenkamp2170]

Do more please. Thank you.

[@Tubular-Trev]

Thanks! Good video

[@linuxsport]

great video thanks

[@crusivol]

thx for the quick reply sir but i have another one please i know the man pages can be found in /usr/share/man/ . The files for the man pages pertaining to a program can be found in man1/ and are compressed using gzip how do i copy all the man pages that pertain to md5 to a new directory in ~.

[@rzaaeeff]

Thank you, Kris!

[@DigitalMetal]

No Problem. :)

[@rzaaeeff]

Are you sysadmin, dear? :)

[@DigitalMetal]

Heydər Rzayev No, I'm a Fire Fighter.

[@rzaaeeff]

Kris Occhipinti, good luck to you with fire )))

[@crusivol]

@metalx1000 im at a lost right now. what is the use for the -r flag for grep

[@haleyneil]

Love the video, very helpful. I am very new to grep and I am trying to display 5 character words from the dictionary with only one duplicate letter and then display the duplicate letter next to it and then display the other letters that we not duplicated next to that. So far i have grep "^[a-z][a-z][a-z][a-z][a-z]$" usr/share/dict/words. Not sure where to go from there though. Would you have any ideas to get me started?

[@tracywebb8633]

Haley Benshaw

[@shizyninjarocks]

So useful!!! thx thx thx!

[@NeoColossus1020]

What if you have a a variable like such var1="$USER some other stuff" and another variable like such var2='/this/dir'. How could you make a 3rd variable that saves the output of your grep? var3=$(`grep -iq $var1 "${var2}"`) doesn't seem to work. I know the syntax is probably not right here, which is why I'm stuck.

[@mehrdadpc]

That's Awesome , Like Linux!

[@DigitalMetal]

@bamdadkhan: I don't know how to do it, but I know it can be done. I'll let you know if I come across anything.

[@wnegenennegentig5919]

thank you, this is what I want to know

[@ankursharma1461]

where should I keep this word.txt file, which directory, I installed Ubuntu on windows from the store

[@sagarkarale]

hey thanks for the explaining grep in a nutshell. Just a quick question, how can i just parse/select a particular pattern from the entire file. For instance, what will I use to search and extract number "1000". Don't want the entire line that has 1000 in it but just the number 1000. Hope my question makes sense. Thanks again.

[@DigitalMetal]

Sagar Karale I understand what you are asking, but I don't understand why you would want to do that. Are you trying to get a count of how many times "1000" shows up?

[@sagarkarale]

Kris Occhipinti Ya that's one use. So I use utilities like nmap/netstat/nslookup but it spits out more result that I need. For instance, you can do a "host facebook.com" on your mac... and need only the IP address (v4 either v6) I'd use a regex along with grep but then it filters the entire line and not just the IP address. Hope that helps.

[@DigitalMetal]

Sagar Karale Awk might be a good option: ifconfig | awk '/inet addr/{print substr($2,6)}' You can use grep with some other tools: ifconfig |grep -A1 wlan0|tail -n1|cut -d\: -f2|awk '{print $1}' hope these help some

[@sagarkarale]

Kris Occhipinti ya. i know about other utilities.. was looking if grep has something similar. Thank you for response.

[@RanaMuhammadWaqas]

Hey thank you for nice tutorial I want to search words in the terminal output like the result of "ps aux | grep netbeans/or-any-app" and for example i just want to look at some string in that output what command i can use to do that ? Thank you in advance !

[@DigitalMetal]

I'd be glad to help, but I'm not sure I understand the question. Could you re-phrase it? Also, try contacting us here: filmsbykris.com/irc.html

[@gaBehcuoDsuoitneterP]

RegEx playlist?

[@gr33nman]

You had the line 'kris is kris'. Why didn't grep ^kris$ word.txt pick up this line?

[@kevinquinnyo]

awesome

[@amstvm]

Good!!!

[@killerbee133b]

Give a regular expression that would match any string that begins with A and ends with B. Matches would include: AxxxxB AB ABABABAB

[@aldolunabueno2634]

7:15 Great trick for erase empty lines: grep -v ^$ file

[@DigitalMetal]

@philipkthompson: grep " foo" text.txt

[@russelljenkinsfearn]

@vanomel Thanks!

[@vanomel]

@russelljenkinsfearn because it search only for line with one word. If you want to find lines like you said you have to put in something like this grep ^kris*kris$

[@garyjames2184]

Can I pull ssn with regex

[@DigitalMetal]

yes

[@JohnLiuFromHK]

More plz,:) i am confused with ? And + :(

[@eatemadfanaee5954]

can't hear anything!

[@samjonesi2658]

a