For those in a hurry! Till 6:13 he explains what is Shell Scripting and how it's done: In Windows, you create .bat files with a command on each line in the file so CMD executes one-by-one. In Linux, we don't use .bat but .sh, and also, we specify a Shebang so Linux knows what interpreter to use (the default is Bash) Till 7:45 he explains Variables (i.e x = "Text") and how to make Bash distinguish between letter 'x' and our Variable 'x' Till 8:49 he tells how we can prompt the user for input with command 'read'. Terminal pauses, until data is input. To display a specific message before the blinking cursor use 'read -p ["TEXT: "]'. (-p displays the "TEXT" you provide before it collects input.) To store the data input in a Variable write the name of the Variable at the end of the command: 'read -p ["TEXT: "] VAR'
Technically speaking, in Unix/Linux/macOS, the file extension on the file name of the script is irrelevant. People can be opinionated about using it, but it truly is only a convention. What makes your script file an executable script in Unix-like operating systems is setting the execute (x) permission on the file. Then, the shebang line (#!) tells the system what type of file it is. The first two characters (sometimes they are each 16-bit) or bytes are called the file signature or magic numbers. The shell is using the exec() system call, which uses the magic numbers to determine how to launch the file as a new process: Binary file (run the machine code inside, depending on the OS) or text file (launch an interpreter as a new process and pass it the text to interpret).
bash scripts are more similiar to powershell scripts than they are to batch files to be completely fair. sure you can use them like you would use batch files in Windows but they're way more powerful than that since they're actual programming scripts and not just a set of instructions.
Bookmarked - use Linux all the time in a job I'm now 3 years into and never bothered to learn this stuff when moving over from WIndows, even though I swapped out cmd for git bash a few months back on all my PCs. I don't have time to watch your TH-cam videos anymore - that MERN course is taking up all my free time :D - great course btw: you have a wonderful, natural teaching style.
omarislearning I do come back to things I book mark. I’ve book marked a python cheat sheet, bash cheat sheet, calculus book and a data structures/algorithms website. I’m constantly going back to them sites, so having them bookmarked is helpful.
Revisiting for a great refreshah. I remember watching this at random when I started at a startup based in Boston... gave me the full MA experience. Love the accent.
please tell me you know the WHILE loops in other programing languages right? and how on earth this while loop that he just read and wrote from his script doesnt need any explanation of what -r is? and what the condition of the while loop is? how is this choherent and time saving? I assume you are a programmer like myself
Thanks dude! I really appreciate this, especially as a recent cs grad where they make you do at least a half dozen different languages including some less popular ones... I'm just like why in the world did the four years of curriculum never include a single class period to explain bash syntax? Kinda nuts to me. But yeah, thank you!
There is so much Love and appreciation here, I was just poking around and was overcome with positivity.(I was losing all hope for humanity just prior) I'll be camping out here until I can reach an understanding of Bash without BashING something in the process. Thank you all for making it possible to enjoy learning and by supporting one another, we can all get the skills it takes to BASH Bash!
2:54 Not anymore, as of 10.15 (Catalina) macOS uses zsh as its default shell. bash executable is still present on the system though and your scripts will run just fine as long as you include the shebang (#!/bin/bash) as their first line.
Thank you Brad! Some recommendations to shell scripting learners: * writing "set -e" before other instructions, stops the script in case of any command error. It is pretty useful specially when learning shell scripting. * also I would recommend use a sandbox for learning, shell script could be destructive (very).
Amazing video man ! I learnt so much from you by following along on my computer and I can definitely say without a doubt that I'm more comfortable with bash scripting basics after I watched your video. Thanks for the educational content Keep up the good work !
Fun little tidbit I like to think is BASH due to it being named after Bourne Again SHell is essentially what it means, was a project by a man with the surname Bourne who essentially abandoned the project but later took it back up himself or someone else or some other people and completed it, is the default in a lot of Linux distros :)
Number sign? Money sign? That terminology is some next level wordery. Hash/pound (I prefer hash as pound could be confused with £) and dollar. Just a little issue and probably me being overly pedantic! Good video nevertheless :)
Thank you so much for this video. I'm new to Linux and I've been eager to script. My only experience with scripting came from mIRC from when I was about ten, and a text- based game builder called adrift. I'm happy I'm trying Linux and this video makes Me excited to explore the possibilities.
in 27:29 there is actually a bug; the last line will not be displayed, to allow the output of the incomplete line and fix the last line problem you should try this code: #!/bin/bash LINE=0 FILE_PATH="./new-1.txt" # Add IFS= option before read command to prevent leading/trailing whitespace from being trimmed # The extra -n test will detect this so that the loop body is allowed to output the incomplete line. while IFS= read -r CURRENT_LINE || [ -n "$CURRENT_LINE" ]; do echo "$LINE:$CURRENT_LINE" ((LINE += 1)) done
Awesome video (I'm definitely a beginner). Thanks for the info, and great to hear another New England-er. I'm originally from Mass and I can hear the accent VERY clrearly.
This was great and I'm happy with you changing up the material a bit. I've been wanting to learn more about System Administration and IT. I know this stuff is basic but it's still a good intro.
It was quite the exercise reproducing all this in zsh. I don't feel a need to resurrect bash on my Mac, but I do spend time at the command line so I might as well brush up on my antiquated skills.
Questions : 1.Why we need $ sign to get all the file FILE=$(ls *.txt) 2. While increment we didn't use $ sign LINE=1 while read -r CURRENT_LINE ((LINE++)) Thanks, for your tutorial
Great video as always, so many people tend to forget how useful shell scripts can be. It would be very nice if you can talk in future videos about tools like sed, awk tr grep and their interactions using shell scripts. Great regards from México!
I had been taught that UPPER_CASE variable names should be reserved for system use. Although I do in fact use upper case for variables I export, I always prefix these with some variant of 'BCH_' (my initials) to avoid name clashes.
Hello Brad, Thank you very much for extremely clear explanations and clarifications ... Very very well done ;) ... Have a great day and Thanks once more time :) ...
Brad- There is a plugin called CodeRunner for VS Code that allows you to r-click and run the code for the whole file in most popular programming languages instead of having to type the code into the console.
Hi Brad, Awesome tutorials, I know a bit of bash scripting b4, this is great. I'm a Nigerian. Your free videos and courses I have bought has really helped me alot in my career has a web developer. Please, I would like you to do a video on vanilla PHP email verification and forgot password system. Here in my country PHP developers are highly paid. I really love your self help videos, Thanks in advance.
Awesome video, Brad. You rock, man! What do you think about going on some tutorials on devops? It is so difficult to find good and easy to understand information on the subject. Don't know if you're into that too, but would be great!
I know this video is super old now, but noob tip. Be mindful of the spaces around the if elif statements. If you dont add them it throws a "./myscript.sh: line 20: [Josh: command not found" Little bugger caught me out.
Good stuff Brad...You always know some good content is coming up once that transition music starts. And you never dissapoint. Big up on the new content, i've always enjoyed your tutorials. And i cant wait for the JAVA stuff...lookin forward to it
That was good. Thanks! I really like the idea of venturing into other areas. The ultimate for me would be to figure out how to write programmes that USE other programmes. However, I'm not too sure how to go about that.
For those in a hurry!
Till 6:13 he explains what is Shell Scripting and how it's done: In Windows, you create .bat files with a command on each line in the file so CMD executes one-by-one. In Linux, we don't use .bat but .sh, and also, we specify a Shebang so Linux knows what interpreter to use (the default is Bash)
Till 7:45 he explains Variables (i.e x = "Text") and how to make Bash distinguish between letter 'x' and our Variable 'x'
Till 8:49 he tells how we can prompt the user for input with command 'read'. Terminal pauses, until data is input. To display a specific message before the blinking cursor use 'read -p ["TEXT: "]'. (-p displays the "TEXT" you provide before it collects input.)
To store the data input in a Variable write the name of the Variable at the end of the command:
'read -p ["TEXT: "] VAR'
Thanks
Technically speaking, in Unix/Linux/macOS, the file extension on the file name of the script is irrelevant. People can be opinionated about using it, but it truly is only a convention. What makes your script file an executable script in Unix-like operating systems is setting the execute (x) permission on the file. Then, the shebang line (#!) tells the system what type of file it is. The first two characters (sometimes they are each 16-bit) or bytes are called the file signature or magic numbers. The shell is using the exec() system call, which uses the magic numbers to determine how to launch the file as a new process: Binary file (run the machine code inside, depending on the OS) or text file (launch an interpreter as a new process and pass it the text to interpret).
@@stuffandymakes1648 yep u dont even need an extension
bash scripts are more similiar to powershell scripts than they are to batch files to be completely fair. sure you can use them like you would use batch files in Windows but they're way more powerful than that since they're actual programming scripts and not just a set of instructions.
Thank u
I have a test in 3 hours' time and this guy just explained a whole chapter with 98 pages in 32 minutes.
Thanks, man keep the videos coming💝
Bookmarked - use Linux all the time in a job I'm now 3 years into and never bothered to learn this stuff when moving over from WIndows, even though I swapped out cmd for git bash a few months back on all my PCs. I don't have time to watch your TH-cam videos anymore - that MERN course is taking up all my free time :D - great course btw: you have a wonderful, natural teaching style.
Dude is the MERN from Traversy ? which one and where it is ?
honest question, did you come back to it after you bookmarked it or nah? i am just wondering since i seem to never do when i bookmark stuff.
plus he's a hottie ;)
omarislearning I do come back to things I book mark. I’ve book marked a python cheat sheet, bash cheat sheet, calculus book and a data structures/algorithms website. I’m constantly going back to them sites, so having them bookmarked is helpful.
It's always so interesting to learn from you.
You are great teacher.
I have huge respect for you
Have I ever told you I love you man? Just what I needed
I'm so happy that you aren't being condescending, but friendly as well. Clear, concise language. Much appreciated.
Just in time Brad! I got a paper due on sunday on bash scripting :)
Lucky you were
@@brianadams2862 Did we meet in The Summer of 69??
@@metdelta1 Nop
echo "Awesome Content!!!" >> Traversy Media
NAME="Raghul Baskar"
echo "Nice comment ${NAME}!" >> $NAME
while 1; do echo 'Hello everyone!'; done
Not to be that guy but... file has no extension
@@yersonlasso9754 file extensions are not really required much outside of Windows
Nailed it fr
This is the best tutorial for bash scripting covered in such a short time. You really saved me
Revisiting for a great refreshah. I remember watching this at random when I started at a startup based in Boston... gave me the full MA experience. Love the accent.
I can’t think of a more deserving person for all the success he’s got
Thanks Brad, I really appreciate you doing these tutorials. I think TH-cam should have more people like you.
Waiting for the intermediate and the advanced one! AMAZING!
One of the best beginner videos for shell scripting. Doesnt over-explain. Great stuff!
One of the best shell scripting videos! Coherent, Informative, right into the point, and time-saving.
please tell me you know the WHILE loops in other programing languages right? and how on earth this while loop that he just read and wrote from his script doesnt need any explanation of what -r is? and what the condition of the while loop is? how is this choherent and time saving? I assume you are a programmer like myself
Thanks dude! I really appreciate this, especially as a recent cs grad where they make you do at least a half dozen different languages including some less popular ones... I'm just like why in the world did the four years of curriculum never include a single class period to explain bash syntax? Kinda nuts to me.
But yeah, thank you!
I did bash scripting in my cs degree but I cant remember any of it! :-)
Probably the best video I've found on the subject so far.
This tutorial is timeless. Wonderful and relevant after 2 years too.
Just listening to this man speak calms me down. You get my like sir.
"I let my accent slip out a little too much there" HAHAH love it 19:57
Only For iOS?
This is honestly one of the best Shell Scripting tutorials out here. Thank you so much for this amazing video, it really helped me a lot!
There is so much Love and appreciation here, I was just poking around and was overcome with positivity.(I was losing all hope for humanity just prior) I'll be camping out here until I can reach an understanding of Bash without BashING something in the process. Thank you all for making it possible to enjoy learning and by supporting one another, we can all get the skills it takes to BASH Bash!
You are awesome dude ! Thanks for making the world a lot easier.
Great content! I like the pace, just right. Keeps you interested without overwhelming. Easy to follow along. I subscribed!
2:54 Not anymore, as of 10.15 (Catalina) macOS uses zsh as its default shell. bash executable is still present on the system though and your scripts will run just fine as long as you include the shebang (#!/bin/bash) as their first line.
brad your tutorials are simple straightforward thanks for making everyone's life easier thank you
Thank you Brad!
Some recommendations to shell scripting learners:
* writing "set -e" before other instructions, stops the script in case of any command error. It is pretty useful specially when learning shell scripting.
* also I would recommend use a sandbox for learning, shell script could be destructive (very).
You save my system design lab
The teacher take four months for this
You nailed it on 30 mins🤪🎉❤️
Amazing video man !
I learnt so much from you by following along on my computer and I can definitely say without a doubt that I'm more comfortable with bash scripting basics after I watched your video.
Thanks for the educational content
Keep up the good work !
i have loved this Crash Course video because it has rich content with real case examples
This is by far the most distinct programming language I have come across and that's a comparison with PHP, JavaScript, C++, and Java.
Thank you for taking the time to put this together. I learned so much from this, I really appreciate everything you put out.
Uploaded 3 years ago...
Brad, you are the best🐐
OMG.. the quality and the content diversity of the channel getting improved in every video. Hats off to you.
Thanks Man for this video, I have my lab exam in 3 hours and this video helped me alot
I was so lost watching other content on this topic as I'm a newbie
You just saved me
You just made things simple. Not confusing by putting too much into it. Got it what's needed.👍
You just saved me a $20 course online, thank you.
it's refreshing to watch a 30 min video that I actually wanna watch, thanks for this video, I'll have a job interview about shell today :)
The tutorial that teaches what Udacity couldn't break down properly. Thank you!
that's why you actually try to look up free sources for learning online before just throwing your money at shit
Every time I click on Brad's videos I like it before the intro even plays.. Here in 2020
thanks Brad. This is really a short and sweet piece of video and one of my best used half an hour.
For a Non CS background software Engineer like me. You are just GOD bro. Thanks a lot ❤️
I really like this non-Indian tutorial. Thanks!
God bless you, Brad@Traversy Media. Thank you.
This is a very useful tutorial.... and ur presentation skill is awesome.
Thanks
Wow. The renaming file hack at 24:24 is life changing.
Fun little tidbit I like to think is BASH due to it being named after Bourne Again SHell is essentially what it means, was a project by a man with the surname Bourne who essentially abandoned the project but later took it back up himself or someone else or some other people and completed it, is the default in a lot of Linux distros :)
I recently learned how to setup my own VPS with NGINX and Node on it so this couldn't have better timing, will watch it soon. Thanks Brad.
Number sign? Money sign? That terminology is some next level wordery. Hash/pound (I prefer hash as pound could be confused with £) and dollar. Just a little issue and probably me being overly pedantic! Good video nevertheless :)
Thank you! I am cramming for my Linux +exam and this helps a lot!
I don't want to be an expert on this, but just know enough to be aware. This did it!!
Shell Scripts! I love shell scripts. You can do all types of neat things with them.
Thank you so much for this video. I'm new to Linux and I've been eager to script. My only experience with scripting came from mIRC from when I was about ten, and a text- based game builder called adrift.
I'm happy I'm trying Linux and this video makes Me excited to explore the possibilities.
in 27:29 there is actually a bug; the last line will not be displayed, to allow the output of the incomplete line and fix the last line problem
you should try this code:
#!/bin/bash
LINE=0
FILE_PATH="./new-1.txt"
# Add IFS= option before read command to prevent leading/trailing whitespace from being trimmed
# The extra -n test will detect this so that the loop body is allowed to output the incomplete line.
while IFS= read -r CURRENT_LINE || [ -n "$CURRENT_LINE" ]; do
echo "$LINE:$CURRENT_LINE"
((LINE += 1))
done
HI Brad , great video , will there be anymore videos on shell scripting ? we would like to see more from basic to advance levels .. thanks man ! 😊
Thank you, Brad.
You are definitely the best teacher in the world.
Awesome video (I'm definitely a beginner). Thanks for the info, and great to hear another New England-er. I'm originally from Mass and I can hear the accent VERY clrearly.
This was great and I'm happy with you changing up the material a bit. I've been wanting to learn more about System Administration and IT. I know this stuff is basic but it's still a good intro.
Your teaching style is awesome man
Hey Brad, how come you know I was on the lookout for a this exact thing 👍
crypto explorer, same
just in time, towards my preparation towards my eCPPT certification.....simple and understanding ...big thanx
It was quite the exercise reproducing all this in zsh. I don't feel a need to resurrect bash on my Mac, but I do spend time at the command line so I might as well brush up on my antiquated skills.
Thank You Sir, the way you explain is awesome. It directly goes into mind. I learnt a lot from your tutorials.
Much respect.
Thanks buddy. It's short video but much tought must of basics in very clear way. Thanks a lot
Questions :
1.Why we need $ sign to get all the file
FILE=$(ls *.txt)
2. While increment we didn't use $ sign
LINE=1
while read -r CURRENT_LINE
((LINE++))
Thanks, for your tutorial
Really crash course for bash beginners ...Must go for a 30 min valuable watch...
My name is also Brad so for a split second it freaked me the hell out when you said it.
Very practical! Every basics are all here!
i don't feel bored any time of learning from your channel...
13:06
Small small fix.
line 49, the echo should actually say "$NUM1 is less than or equal to $NUM2"
Great video as always, so many people tend to forget how useful shell scripts can be. It would be very nice if you can talk in future videos about tools like sed, awk tr grep and their interactions using shell scripts. Great regards from México!
did you forget about python you stooopeid weetawd
simple and very practical .... you have covered top common syntax .... thank you!
I had been taught that UPPER_CASE variable names should be reserved for system use. Although I do in fact use upper case for variables I export, I always prefix these with some variant of 'BCH_' (my initials) to avoid name clashes.
This is a really GOOD content. Thanks Brad! It is always good to learn more about something that I know. Always learn more.
Hello Brad,
Thank you very much for extremely clear explanations and clarifications ... Very very well done ;) ...
Have a great day and Thanks once more time :) ...
his name is mike. all of their name is mike. mike this mike that. that or frank.
I hope this helps me pass my exams at Shell,great tutorial!
Awesome vid. I like the idea of the channel branching out. There is so much stuff out there and it keeps things fresh.
In most of these beginner tutorials, I never see grep. That was one of the first commands I extensively used and is quite a simple one to explain.
if you are my teacher in my school and college days. i will be in a different position. thanks for sharing knowledge in an understandable way.
You are really great as usual !! I immediately liked the video.
Fortunately, you are here. Thank you very much for eveything..
This is really a great video! It has everything for a beginner to know. Concise and useful!
Brad- There is a plugin called CodeRunner for VS Code that allows you to r-click and run the code for the whole file in most popular programming languages instead of having to type the code into the console.
I am wondering is there anything this guy don't know that exist in web apps. 😂😂Huge respect Brad.great content though.
This is the video I've been looking for! Totally have been needing a good CLI shell script video. Thank you!
On point, very compact video. Thanks a lot for this great source for a start into bash scripting!
Hi Brad,
Awesome tutorials, I know a bit of bash scripting b4, this is great.
I'm a Nigerian. Your free videos and courses I have bought has really helped me alot in my career has a web developer.
Please, I would like you to do a video on vanilla PHP email verification and forgot password system. Here in my country PHP developers are highly paid.
I really love your self help videos,
Thanks in advance.
Highly paid 😂😂😂
Great video as always. I'd love to see some C++ tutorials!
Best dev canal ever! Hello from Russia!
Awesome video, Brad. You rock, man! What do you think about going on some tutorials on devops? It is so difficult to find good and easy to understand information on the subject. Don't know if you're into that too, but would be great!
This will help me automate lots of my work
I like this keep continuing doing this type of tutorial even if there are not related to web.
Hi Brad, small correction at 23:58 . the "new-$FILE" should be "$NEW-$FILE" to get the perfect output. please review it and let me know if I am wrong.
Brad, man on fire... keep radiating - we shall soon hit 1m subs.
I know this video is super old now, but noob tip.
Be mindful of the spaces around the if elif statements. If you dont add them it throws a
"./myscript.sh: line 20: [Josh: command not found"
Little bugger caught me out.
You are a awesome, I understood everything perfectly, thank you.
Good stuff Brad...You always know some good content is coming up once that transition music starts. And you never dissapoint. Big up on the new content, i've always enjoyed your tutorials. And i cant wait for the JAVA stuff...lookin forward to it
Thanks Brad. I was always scared of learning bash scripting until I watched your video. Subscribed :)
That was good. Thanks! I really like the idea of venturing into other areas. The ultimate for me would be to figure out how to write programmes that USE other programmes. However, I'm not too sure how to go about that.
This is gold! Exactly what I was looking for as a beginner! BTW How do you comment out multiple lines?
Looking for this too - edit: found it, on linux press ctrl + / when selected, I installed shell-format extension to my codium