Linux processes, init, fork/exec, ps, kill, fg, bg, jobs
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- เผยแพร่เมื่อ 18 ต.ค. 2024
- Delve into the Linux process management system and see how everything fits together.
Hope you enjoyed the video!
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Sincerely,
Engineer Man
Been a linux user since 1995 but I still learned something. Thank you!
Glad I could bring you some new knowledge!
Same (1993) Still have trusty Using Linux Sixth Edition (QUE) on my desk..
Same here since 1999... Only used kill with -1, -2, -9... fg and bg were new to me. But as a lazy dev I've used it from' top' (even better 'htop') or directly with 'xkill' - point and click style :).
I don't think I ever hear such clear explanations. Thank you very much!
Instead of using 'clear', you could use 'CTRL+L'.
But it's not the same as clear. It just scrolls the current prompt to the top, you can still see the older commands when scrolling back up
and when you go ‘set -o vi’ to enable vi mode at the bash prompt ‘ctrl-L’ does not work
these linux videos are fantastic
This was an excellent video that got me up to speed in a hurry.
Very well organized and nicely explained.
A great jumping off point for my own exploration.
Thank you!
That was amazing Engineer; wish i could 'fg' all of my postponed tasks and "kill -20 bad-mood" !
Why not kill -9 it :D
U mean 9?
I'm 3 minutes in & I've learned A LOT!
Thank you! You're the kind of people we need on youtube regarding linux.
I am learning this at college, but everyone one is struggling due to our harsh teacher making the most hardest test questions. He does not give good material to study, but thank God I came across your channel. I finally understand the real purposes of these commands and enjoy this now!
Always appreciate the quality of your videos. Goes in depth, but accessible to beginners
That's my aim :)
this was so incredibly well explained. my prof was making a shit show out of this chapter by just throwing a bunch of words at us. going back and reading his lecture notes, i can understand it now, and i furthur can see how poorly written his lecture was. thank so much for this.
Glad it helped :)
I wish knew your name to properly address my thanks to you and this great video...The quality f your explanation but also the goodwill to share it with the community, my deep respect!!!
My name is Brian :)
11:54 We can use `watch -n 2 jobs` to monitor jobs command every 2 seconds.
so we can show the realtime result from pane 1 when the process killed at pane 2.
some energy efficiency and fun than manually type a repetitive command.
Thanks for this awesome tip! This is a game-changer!
Great content! I've recently started working with linux again and it's awesome to get to know more!
I wonder what distro are you using since your 'kill -l' output is so different than mine. Yours is more complete and is numbered while mine is just a list of signals, completely useless.
As usual great video, very well prepared and organized, and your communication skills are superb ;) you are a very good teacher. I've been a linux user since 1998 and still learning things.
Very much appreciated.
Most shells supply a "builtin" version of kill, try: "type kill". The presenter uses the Bash shell. I use Z-Shell, and its builtin is quite terse. try "/bin/kill -L".
really love these videos, I'm learning a lot. Very very accessible and clear videos, please keep up the good work.
Just a wow content .. awesome man that u indirectly mentioned about difference between killed and terminated process ..love u
I'm happy that I recognized all the commands :)
Where was this 3 months ago during my Operating Systems course?
You're looking for W. Richard Stevens' books on UNIX programming, where all of this stuff is explained in detail.
going through it right now in OS course and it is kicking my ass
I feel like I am watching the Rockwell Retro Encabulator video
your content is neat and tidy I can't be grateful more for what you've done on this channel. your contribution for linux learning community is huge
These are very involved processes, but you explain it all so well, and in such a good order. Thanks!!
The few videos of yours I've seen are excellent and simple explanations! I will be sharing these with my friends (who are learning) and also my users from my Raspberry Pi series. cheers!
Thank you :)
Thank YOU :)
Very helpful. I've only ever seen htop for process management and this helps to understand the underlying signals being sent. Thanks!
Great job! Recently found these series and am fascinated! Subscribed immediately! Keep up the good work!
Very well explained. Keep uploading such videos. Sound clarity is really good.
UNBELIEVABLE !!!...why??? Personally I have the habit to check the ratio dislike/like of all videos I intend to watch. I don't go around looking for higher or lower ratios, I just do it before watching it. That said, most of excelent videos I have watched has a ratio score between 1% and 3%. This video of yours has the impressively amazing ratio of 0.35% (5/1400)... You got a new susbscriber and a big fan on a 20 years linux admin.
:) Welcome.
Dude props on how well you explain everything!
Thank You man! I really like your videos. I know what those commands do, but Your explanation of what is really happening in Linux is golden! Yo have a gift to explain things and teach people. Great, great stuff. It's helping me a lot.
I want to thank you for the quality of your videos, not just this one. All of your videos
You're welcome!
Thanks you for this video . Would like to see more on Linux/unix series
You make the concept of these command so clear. Thank you soooo much
Ctrl c sends a SIGINT signal.
Init is the first process pid = 1
Bash first fork (copies ) the process and than exec (replaces ) the process as child process.
T = stopped state
S = Interuptable sleep state ( Running in bg)
Kill -15
Kill -2
Kill -1
Kill -9 ( my fav )
Really nice and clear. Would you like to make an video about using strace ?
hey just started watching your videos and they have helped me a lot. i like they way you explain. Would you be willing to do a video explaining named pipes for server-client, using multithreading or select() for parallel requests? Thank your for your videos, and keep up the great work :)
Great as usual!
Been using unux since 1980 and linux sice 1995. This is good stuff!
Wow :O
You are a life saver. You are exactly what I need right now. TY.
Brilliant and simple explanation about kill signals. Thank you.
Thank you. This really helps me for my current project
Good job 👍🏻 The way you explain is awesome. Even knowing such things I continued watching. Keep it up!
Thanks for the kind words, hope I helped in some way.
I appreciate you sharing wisdom to linux noobs like myself
after watching 15 sec I knew that this is proper and what I was actually looking for :D
One thing I find very useful is having a process run outside of their parent process So For example if i run a long running process on the bash terminal I can exit the terminal and check on the process later on. You can do this with the screen command.
You have taught me that kernel has parent ID of zero.
This is the foundational level upon which I shall build many great things.
It's a kernel like a popcorn kernel.
Diprotic there is a grain of truth in that.
Thanks man! You just upgraded my workflow.
Excellent explanation of the above terms
It's funny that kill can also bring a process to life as well.
Thank you for teaching us Linux, Programmer Mrbeast
Great video, Informative, thanks for sharing🙏
Learned too much with this video, thanks too much man!
Exactly what I needed. THANKS!
Thanks so much for these videos. You’re truly a jack of all tech trades.
That was amazingly clear and insightful.
They took yerr jobs !!! Great video man btw. I learned some things from this which my Operating Systems teacher didn't teach me. :)
Great video ... Learned a lot ... You're a gentleman and a scholar ...
3:36 specifying ps options without a dash is BSD-style syntax. Probably best avoided.
Superb clarity as usual!
really love your videos I learned a lot of stuff about killing
Processes are very powerful if you understand them. Theres this wonderful site called man7 that covers processes, daemons, and much much more. Theres also lots of IBM documentation on how to write a processe. Anyway thanks for the vid I haven't studied it in a while.
Clear and concise information. Thank you!
Hi Engineer Man,
Have a series of videos on sed and awk commands..
Thanks in advance..
An Engineer
I'm really enjoying these videos. Thanks
Thanks for the videos. Keep them coming!
I learn a lot from your videos. Thanks!
Thanks dude, pretty clear and simple!
3:05 Perhaps make it clearer by pointing out that the “exec” command is a bash builtin which tells it to skip the fork() call before running the rest of the line as the actual command.
Very interesting, hopefully I can use these in shell scripts for something
Super helpful, super concise, thanks!
I have learned something new. Thanks much.
Also check out pstree, which lets you view processes as a tree, helps you see the forks and execs.
Great linux videos. I hope more are coming cuz i rly want to learn linux
thanks Mr.Beast for this very good explanation 😁😅
Awesome vedio.....All linux users should have a look
I love that mr. beast takes up software engineering.
Hehe
I would never expect young Che Guevara to make such good clean videos. Thanks.
Lmao.
great video, you just earned another subscriber
Very good explenation ! - subscribed :)
Awesome! Where can I find more information like this? I wish to learn and have deep understanding of Linux functioning, commands, etc
Nice video for recap as a linux user
Better then my teacher :) awesome man
I just like getting the uptime of my pi-hole and Jellyfin server Pi. Two weeks so far, hoping no power blackouts!
well organized and delivered
Great video.
Why do different jobs listings appear for different bash log-in sessions?
Great content as always! Thanks man :)
That was a killer video. Thanks!
thanks for such a great channel. I heard about parallel computing on Linux. could you please teach us some parallel computing stuff? bests
Very good. Thanks man. Legend!!!
Excellent explanations, thanks a lot
Brilliant explanation, Thanks
Learned alot about killing
hey man, great video,can you recommend any books or websites for learning linux/unix
Brilliant video! Thanks!
Great stuff. Thanks for this video.
Well I didn't know that. Great content. I will have to look at your other videos now. And subcribe!
FYI It is possible for "kill -9" to fail.
If it does, the disk is probably full.
Or it's waiting for an io operation. It happened to me on a networked drive
thank you so much for clear explanation
This is so helpful thank you man, keep it up.
EM great informational tutorial. I have a simple question though, why would you want to run a process in the BG to regain control of the terminal when you could simply just open another terminal window? I guess without a GUI you'd be forced to run one terminal window at a time.
What are your thoughts?
One reason would be the save time, another reason would be if you start everything in the same terminal, they all have the same PPID and that would allow you to more easily kill a bunch of processes if necessary. It all depends on use case. Certainly using a ton of terminal windows is fine too (I do this).
Another reason is that you might be using a remote terminal connection to another machine, and you need (or prefer) to do all your operations through that single terminal window. Actually in this situation screen can be useful for doing multiple things at once in the remote end.
And yet another reason is that you want to run multiple background commands and monitor the progress of them all in a single window. E.g. something like
download-file-1 & download-file-2 & download-file-3 &
then you get all these running progress displays overlapping in the same window.
@@lawrencedoliveiro9104 Thank you, Lawrence, for this explanation -BR (aka buong10rn0@discord)
you sigkilled it with this video. fantastic!
Ey, this is about init, innit?
Bwhahahaha, I crack myself up :-D :-/
I don't believe a forked child process returns to the parent. The two processes run concurrently, and the child emits a SIGCHLD signal when it completes. The parent will have a signal handler that tells it what to do when it receives SIGCHLD, for example display a message that the child has stopped.
One last thing EM, could you do some videos about HTML/XML, website hosting (using dynamic DNS for instance), etc.? I have some javascript projects I would like to share with everyone but first I need to know how to create a web server to host my very own website, (possibly a VM version of a recommended Linux distro). This could start as a barebone, text editor-based level HTML/XML code tutorial. I'm sure not everyone knows how to write HTML/XML code so a tutorial would be useful! As markup language continues to evolve, understanding the basics and comparing it with the way many browsers use this code would be very educational. As always, thank you so much for sharing your knowledge with this community.
I actually did a live stream on this. Check for my livestream that has a title like "getting that sweet website of yours online".