Write Your Own Bash Scripts for Automation [Tutorial]

[@zephyrus7258]

This is my kind of guy. His eyes tell me he's wasted no more than 3 hours sleeping since birth.

[@djvincon]

Pissed my pants lol

[@rikkertkuklinski4410]

he's an EXPERT at what he does, and i like it.

[@rikkertkuklinski4410]

@Badger anti R? Which programming language is that?

[@aminechei8509]

@@rikkertkuklinski4410 R is the language

[@rikkertkuklinski4410]

@@aminechei8509 just be carefull. Dont piss the guy off. He might hack you while you're taking a dump and staring into your phone ...

[@jasonpitts8395]

Dude where have you been? I was about to call 911 and report you as missing. Glad you are back.

[@KangJangkrik]

Oh wow false alarm for 911 Good luck at trials bro

[@kingseekerbackup3085]

@@KangJangkrik It was a joke.

[@KangJangkrik]

@@kingseekerbackup3085 I know

[@sprBEAST211]

The grim reaper pulled him into a dimension between space and time, to see who would blink first in exchange for his soul. Cody clearly won 👏👏👏

[@bitonic589]

@@sprBEAST211 lmao

[@nickopop77]

I’ve watched a lot of technical training videos with 20 years in the industry. You do a great job explaining things included with real live demos! Thank you for sharing what you do! Helping others learn too. 🙌🏼

[@kevin_delaney]

I shortened that alias and implemented it into all my servers immediately (in my home) because it is simple and brilliant. I know them anyway because they are static, but I love the simplicity of it.

[@sebastiansimon7557]

You didn’t need the `echo $(`…`)` at the end, you just needed to escape the `$` so it doesn’t get expanded in the string: `alias ipaddress="ifconfig | grep broadcast | awk '{print \$2}'"`.

[@RajivBandaru]

Thanks for this tip. It is more short and useful.

[@DavidConnerCodeaholic]

Phew I’m glad I’m not the only one that caught this. 😅😅

[@DavidConnerCodeaholic]

Fortunately for the civilized jq users among us, there is now “ip -json addr show | jq …” No more ifconfig (I guess? Honestly I never got the ip tools memo, so this has been very confusing for me)

[@NaNa-cq8ck]

I don't understand the concept of 'escaping'.. why did it work without escaping before aliasing?

[@rodrigito78]

Nice bash intro. Half the battle when writing bash is knowing which command and arguments (flags) to pass to it; # hostname -I Returns the system primary IP address. Type hostname --help for details. Of course, I understand the exercise was to demonstrate pipping capabilities of bash. But the less pipping the faster your script will run. Also, this is much better than without the curly brackets. # echo "${STRING}" Excellent job.

[@Alex-uc3ye]

Writing bash scripts has saved me thousands of hours over the years. Thank you for the video, this is incredibly useful.

[@charlesmagno28]

any real world sample you can share? thanks

[@bald_agent_smith]

@@charlesmagno28I got the same situation. For example - it really helps handle server apps, particularly deploy updates (or configs, patches), do system tasks

[@DavidLindes]

Thanks for sharing. A minor correction, re 2:17 - the .sh extension is not actually necessary. And just a note re 12:55, while some folks do call those "curly brackets", a less-confusing name for them would be "braces" -- { and } -- whereas "brackets" (or "square brackets") would be [ and ].

[@codygaudet8071]

You guys are reading my mind! This is EXACTLY the video I was looking for. This video is gold. More like this.

[@sachinmaurya3259]

this is what i was gonna type in comment .....lol

[@jpablosaavedrag]

@@sachinmaurya3259 I was going to type this too haha

[@jpablosaavedrag]

@@dawidsadzak8137 sad u.u but great they made this video

[@codygaudet8071]

​@@dawidsadzak8137Way to devalue for the video for others my guy. If you don't get excited about this, you're in the wrong place.

[@jpablosaavedrag]

@@dawidsadzak8137 True. I've seen a few. But it was a nice coincidence to watch this video today. I know how the world works, still, i think it's a great short video about things you can do with bash scripting.

[@jonyboi21]

This guy explains it better than my professor did last week

[@cyberrock9018]

Are you taking computer science? Or IT

[@bachokiro2866]

Lmaoo thx I will never go to university

[@arghosinha]

I feel thee!!

[@Rahul-lg1nw]

Mine tooooo😅

[@helloMoto-k2]

@@cyberrock9018 which are you in?

[@garcand]

Just what I needed. I was literally just thinking about this! Thumbs up

[@whitedaniel53]

Same bro, thought the algorithms recent update was to read my mind xD

[@user-hy2ry3if8h]

Great video. Exactly what a bash nab (me) needs to start up, see how to make a basic one then build on it, then add more and more and bit of polish ... brilliant.

[@Recon_Racing]

Studying for my Linux+, this is gold

[@AmbushEveryone]

just getting started with Linux Mint on a VM. This video just taught me so much. thank you :)

[@druzod1496]

I love your videos, can't thank you enough for what you do out here, and thanks for taking the time to "give us" this knowledge. Keep. Up the good work!

[@mojo3318]

My dad had me watch this video for a class I'm going to take. This looks interesting. I like coding.

[@AstroDenny]

Cool video- There is a lot of content like this on youtube but your style makes this easy to ingest for beginners. Couple if things though- You don't have to have .sh at the end of it and it you're going to run it with `bash ` you don't need the shebang either. Also, why did you have to fuzz the ifconfig command? I hope you continue this series- bash offers some much more advanced capabilities.

[@1ukastesar]

In the case of shebang, it's better to use `/usr/bin/env bash` instead of the exact shell location so it can be ram on different machines without changing a single line.

[@princesa_lina]

thank you :D

[@zuberkariye2299]

thats neat and smart tip, if i was to write malware on my linux machine and wanted to transfer to a remote machine somewhere else that might be using different shell. It could in cases like that then

[@danlule1]

Thanks a lot, this is very well explained. It is the best explanation I have come across unlike many scripting/programming videos where the narrator often spends a lot of time even hours talking to themselves in vain because they are so badly explained.

[@novikovPrinciple]

Intermediate Tip: Use "man bash" to learn the semantic differences of: "&" (ampersand), "&&" (double ampersand), "|" (bar), and ";" (semi-colon). Most of my aliased commands use these punctuations, with one being "firefox & discord &" and another being "git fetch ; git status ;". GL, HF

[@Ben12312312]

“Oops this isn’t python” hahah

[@karlostj4683]

It's fascinating that Mr. Kinzie explains that you need a "Ubuntu or Kali Linux system, really any Linux system" and then proceeds to create and run bash scripts on a macOS machine without mentioning that macOS does bash as well.

[@Wegottohustlehard]

hey,,can you plz tell what is he using to type that script..cause if iuse vscode i amd not the sam eoutput.thank you!

[@karlostj4683]

@@Wegottohustlehard VSCode is a better editor IMHO but may be more complicated and sometimes simpler is better. Not sure why you're having trouble getting VSCode to work with his examples. I did just try the first script he typed in using VSCode instead of nano, and it works just fine.

[@Neodeejay0500]

thanks from France!! I can't wait for the next video about bash scripting ! :)

[@chffguy]

Been trying to execute a bash file forever! First resource that actually helped!

[@ramgopalvarma5949]

Thank you for showing the error you ran into and the work arounds in the video.

[@OmarImrharn]

I ENJOY your helpful interventions and your professional knowlege. TANK'S TOO MUCH.

[@jackfletch2001]

Holy crap, I'm shocked I actually know almost all of this. I was genuinely nervous thinking I forgot a lot of this stuff.

[@tamirmaidani]

Amaizing ,i did this tutorial on termux(android) , works like magic! Thanx alot!

[@AadilAnsari-ee3ds]

Amazing. Actually the advance commands was awesome

[@oxycodin2253]

I taught my self this exact thing for batch scripting, time to learn bash!

[@pianochannel100]

The no-blink guy is back!

[@jaeger809]

Lol

[@zexsen85]

woooow, Vibrasphere - Sweet september music on the beging.... I am delighted... :)

[@dogbyte7875]

Hey Kody, Thank you for your time and for your video

[@albertsnow7111]

hello . 0:40 It's get my attention that black blanket on the wall. The blanket surface is like the equipment on the voice lab to eliminate external sound effect. Am I right？

[@The_Digital_Samurai]

Bash scripting in the new Windows Terminal is very useful.

[@pcampbell-edu8508]

Good habits put in a "header" with the date, your name and purpose of the script. Also keep upper case vars for env vars. ^^^ being kind to your future self

[@GeneralBlorp]

Bash was my entry point into coding! I just wanted to save time on repetitive tasks and chill more while at work; upside was that I learned I could annoy my supervisor by being such a TryHard.

[@pianochannel100]

See but now they'll just give you more work if you prove yourself to be so efficient.

[@justinc4782]

@@pianochannel100 yes if you ever make these kind of tweaks keep it to yourself and dont brag about it! :)

[@derpoblizist9076]

@@justinc4782 it depends where you want to go, to have a cushiony job with few working hours, then just quietly do your part. If you want to be more successful and have a job that recognizes this effort, then ask for more work.

[@wasssuuuppp]

Any book recommendations to learn it more advanced?

[@charbelalam2648]

He stares the information into my soul.

[@jeremymesloh1981]

You could also do ifconfig | awk '/broadcast/ {print $2}' which would let awk grep and parse column.

[@analactica]

Yeah that's definitely WAAAAY ahead my level atm , i didn't understand a thing , hopefully within a year I would 🤣🤦🏻‍♂️

[@rodrigito78]

# hostname -I (uppercase i)

[@analactica]

@Learn Linux im starting to get the idea actually , my issue is the way i learn , unlike most people i need the bigger picture first , then the break down , not the other way around , sooo ya lol

[@kuldeepsingh2983]

I was looking exactly for this. Very nice content.

[@worldboy9684]

Nice trick using a subprocess in an alias! Thanks

[@DennisGentry]

1:16 "You can always pick up a Raspberry Pi" lol

[@diegoleon1144]

This guy teach like a master.

[@benjamindreyer9884]

Me thinking about something* One day later this dude who never blinks says: “hmm maybe i should make a video about that”

[@moth5005]

sick video , the alias thing is really cool.

[@gedeonducloitre-delavarenn8106]

From man bash: For almost every purpose, aliases are superseded by shell functions. So no, aliases are not cool (apart maybe for just one command, but it gets crazy when you want to put more than one command with quotes; and also they can't handle arguments). Functions are cool!

[@BRBTechTalk]

Thank God you did not use "Hello World". I have created scripts before and I understand them but this was helpful for other variables I have not used.

[@imagreatguy1250]

This is good stuff mate 🧠👍

[@douglawson8937]

a bit confused @8:53 with "read name". If name isn't defined as a variable yet, how is it reading it as the only reference to "name" previously is in the string?

[@michallasan3695]

In bash, all variables are string, no need to declare, the default value being empty.

[@ggsap]

Actually to find out the shell you are currently using you need to execute which $SHELL since most of the time you want your current shell to interpret your script

[@lollubrick]

I was going to comment to bash you for using nano but then I realized that I started doing anything on the *nix command line using nano instead of vi so I can't really say stuff; but vi is the best thing to learn.

[@HikikomoriDev]

A lot of power to the user. Very useful.

[@ashpakpinjari9214]

Please continue this bash series.

[@VulcanOnWheels]

4:56 How did you change that 2 into a 3? 7:07 Why not just use "whoami" by itself?

[@jpdominator]

I wouldn’t recommend using aliases like that. Make them little scripts. Aliases are part of bash expansion. Using grep with your alias… womp womp. Gotta single tick it. Aliases for obscure references. Scripts for other stuff, not piped commands.

[@BurningtunaDC]

"Kody"? Jackie is the punk. Thanks for shooting and sharing such a great tutorial.

[@Anandhpt]

Last task was awesome..thnx man

[@EliteTechnicalSpecialists33]

Great work man 😀 love your videos 👍

[@seratonyn]

Nice~♡ dig the first ifconfig 🤣

[@chitownbob9714]

"Paranoids...HOW DARE YOU!" I love that sticker!

[@cryptolicious3738]

Argumentative bash script! hilarious :D that cracked me up bro

[@vikramnanda2833]

Thanks for the video Please do make more videos for daily task automation

[@jpedithe2171]

Hello , très interessant ce tuto de découverte . J'ai apprécié vos explications et vous dis un grand merci pour ce partage .

[@sirprancealott2003]

Great work Mate. Keep Staring

[@tomigoe376]

Amazing video. Ty Nullbytes

[@frantiseksmrha992]

Thanks man, you helped me a lot. I appreciate your work.

[@tusharmotka1583]

Need more parts of it. 😍

[@ondregonzalez]

Awesome presentation! Thanks for the clarification.

[@imrharnomar9099]

I enjoy your support. your work is very benefit. TANK'S.

[@lxtwin]

To make a script portable say RHEL 6, 7, 8 and 9 you can use #!/usr/bin/env bash instead of #!/bin/bash

[@theazza]

Thanks dude, great description.

[@lawrencedoliveiro9104]

14:00 The reason why that won’t work is because the “$2” gets substituted by the shell at the point of alias definition, instead of alias invocation as you want. Try this: alias ipaddress='ifconfig | grep broadcast | awk '\''{print $2}'\' or this: alias ipaddress="ifconfig | grep broadcast | awk '{print \$2}'"

[@gedeonducloitre-delavarenn8106]

Or just don't use aliases: man bash explicitly mentions *For almost every purpose, aliases are superseded by shell functions.*

[@Jose_T131]

Excellent video brother

[@Sourpusscandy]

Here’s what I’d like, Press the on button, boots to the login in screen. Computer says: who’s there? I answer with my name, Booting finishes, logged in.

[@justinc4782]

boot it into a tty by configuring grub. make your terminal run your little program when it loads use espeak to say "whos there" use the read command to ask for your name and get input, if, else, string contains to check for proper input, then boot into your graphical interface

[@Sourpusscandy]

@@justinc4782 OK cool thanks!

[@cryptonservices9749]

Yay I'm early - I love your videos man ❤

[@krotizmultika]

"belive"... Great video, as always, though.

[@vDungeon]

Use bash, sh, perl etc ONLY in cases when you don’t pass arguments to the script and there is no any “if” like statements instead of checks for a command return code. You will be happy and other people who will work with your code base - too.

[@michallasan3695]

Using bash is good if you execute many system commands, or else your program will spend much time waiting for system.

[@Clean_Slate]

Even though it's quite a simple quide, it's great! Thank you!

[@tommyselbe1999]

Remember: **Syntax is your wand**, and every bug is a riddle waiting to be solved. May your journey be filled with wonder and your code compile without tantrums.

[@smithwill9952]

Industrious intelligent geek. Awesome!

[@vk-chinni]

@Null Byte what that "Codes" book behind you?

[@skunkhead2007]

like the lgos stickers on laptop,any chance you can show us how to getinto v bullitin forums with out wireshark and being logged in...or how to get Ip from same boards not for spamming ...... the forums have some high end elite deepstate players ones a NATO person.

[@naeem8434]

AMazing video sir for beginners.

[@ruszomalkuko]

That's sweet! You can put target IP in $IP and bash scripting enumeration easily now

[@gdekerdanet]

The man doesn’t blink😱

[@maurolimaok]

I've been searching for a tutorial to make my terminal look like this, old green monitor, for a long time. Do you have any tutorial for that? I'm a complete newbie here in Brazil, learning Linux and Terminal prior to learn coding itself. Thanks for the video.

[@Romanslost]

Great timing 😁

[@surajmishra5661]

Can you make a script for making post on social media as planed per user and on given time

[@Ms.Robot.]

This term, Linux, good timing❤️💋

[@davidabba7663]

well this was fun and educational thanks!

[@MrGFYne1337357]

alright, this is more like it. let's be real, a lot of n00bs need to be learning stuff like this and not be so concerned about being the next best h4x0r. Good job Null Byte. /usr/share/thumbs.up

[@brunoh6096]

?

[@zuberkariye2299]

?

[@thengakola6217]

?

[@nickt423]

Can you have windows scheduler run a shell file as an admin? If so, how would you do that?

[@ritvikdayal3735]

A person talking to his code is a brother. 😍😍😍

[@Zimbob2424]

It doesn't stay or save to the system, another words I set it up to watch my cpu temps, " watch -n 2 sensors" which I run whenever my pc is on, so I wanted to type "tmp" it does work but when I open a new terminal it doesn't, so really what is the point, I understand that I'm just learning bash script, so this is a Question, not a sarcastic remark. What I really want to learn is how to have bash scripts run on start up, thanks for the video

[@ben9262]

do we have to edit with nano or is it cool to create the .sh files with vim?

[@ovokteb9671]

Really helpful video . Do you have any course on Udemy that I can purchase ?

[@anaghr1252]

Thank you man for sharing this stuff

[@pavithraprajwal3838]

Sir i want a program or software that when i enter 'enter' button on keyboard that automatically enter tab 2 times & enter 2 in monitor can u plz help mee

[@EdwardVarner]

Why would I put a command (like whoami) into echo to get it to appear when I can just put whoami on a line in the script and it does the same thing?

[@christophmuller7779]

If you are not an admin that works with bash scripting everyday, i would prefer to recommend to use python for automating scripting. You won't look up all of these exceptions of bash every 1-2 months and python is much more intuitive if you need programming control structures. Especially if you have to evaluate/manipulate/forwarding of argument lists from one process to another process. We have ran into this issues every half year in our company. Usually the scripts are simple at the beginning (where bash is completely fine), but they will grow and got more complex. In such condition we always regret it to not implement them directly in python.

[@michallasan3695]

Python is slow, Chads use bash and c++. Chads can handle complexity. You can write bugs in Python, too.

[@cortisolblue2208]

Was the $2 in your final script grabbed from a premade bash script? confused where that came from.