Learn "fuser", a little-known Linux workhorse command!
Ғылым және технология
Ever want to eject a flash drive but you can't because the device claims that it's "busy"?
In today's Lil' Linux Lesson, we dive into the fuser command! The fuser command is one of those Linux utilities that you don't realize you need, but once you learn it, you'll find you're using it all of the time.
This video isn't sponsored by anyone other than you. To help me keep it that way, please support if you can. Thank you so much!
🖖 Support the channel: / veronicaexplains
☕ ...or via Ko-Fi: ko-fi.com/VeronicaExplains
👕 ...or buy a shirt from my website: vkc.sh/merch
📑 Common UNIX Specification: pubs.opengroup.org/onlinepubs...
📺 The recent @LearnLinuxTV video on the lsof command: • Linux Crash Course - T...
Chapters and such:
0:00 What is the fuser command?
1:07 Examples of the fuser command
1:46 Basic usage of fuser in Linux
2:58 Using the info from the fuser command
4:15 Working with mount points or block devices with fuser
4:51 Working with TCP ports with fuser
5:46 Learning more about fuser (and about Linux)
6:20 "What I'm Watching": LearnLinuxTV's lsof video
#linux #homelab #terminal
Пікірлер: 406
Your "eff user" or "eff you sir" jokes are played out. Like and subscribe! 😈
@danielahern3560
9 ай бұрын
in case you're not tired of this: super user do... should that be pronounced su-dO.
@stumbling
9 ай бұрын
I wasn't going to make that joke... >_> ...
@slowvoltage
9 ай бұрын
haha! 💜🙌🏽
@jamesgardner2101
9 ай бұрын
And yet Windows still exists.
@hypothalamusjellolap8177
8 ай бұрын
classic
"Verbosity" is such a great word. Very underrated.
lsblk is such a gem. Thanks for making sure it was mentioned, Veronica.
@JosephMwema
9 ай бұрын
lsblk ~ List Block. fuser ~ Free User resource.
@kingneutron1
6 ай бұрын
Fun fact: ' lsblk ' will not spin up a sleeping drive, whereas ' blkid ' will!
That "except for Amiga OS" shot earned a thumbs up from me!
I've been a recreational Linux user for 20 years now, and I'm still learning new stuff. Thank you for making these videos Veronica, you've made my day once again!
Did not know fuser while using Linux since 1994. Thanks! I probably lsof and grepped if I needed this, lsblk and fuser are a lot more user friendly!
I appreciate your "Lil' Linux Lessons" series! They're always quick and to the point with really detailed info, the pace is not too slow nor too fast, so even a Linux newb like me can follow and not feel like a dummy. Please, keep doing it as a regular series on the channel until there is nothing more to explain (so, forever :o)!
Since you brought up Vim -- `ZZ` or `ZQ` is a great shortcut I learned recently! ZZ saves and quits, while ZQ quits without saving. Love the channel so far! ❤
@dienvidbriedis1184
6 ай бұрын
thanks! that is much easier than method i'm using to quit vi- :!ps -a | grep vi | awk '{print $1}' | xargs kill -9
@MiBox-jn6vx
3 ай бұрын
Oh my god! Thank you so much
I'm an experienced Linux user with quite a bit more than 15 years experience, and in kind of knew that fuser existed but have always fiddled with lsof to get things like that done - and often got frustrated. I will now use fuser for all of my laod needs because now I know it's easier and better - *thank you Veronica* 🙏👏👌
@lrmackmcbride7498
9 ай бұрын
Same here but much longer linux user
@jpcoll2011
8 ай бұрын
Linux/Unix user since the 90s
@fishingangler4315
7 ай бұрын
@@jpcoll2011Congratulations! You won the pissing contest!
@jpcoll2011
7 ай бұрын
@@fishingangler4315 Don't get me started, might talk about my hardware setup 😂😂😂
This is one of the best tech channels on youtube.
As always an educational and entertaining video, but I LOL when you say (3:32) "Linux is not perfect no operating system is..." and you insert a clip from Amiga OS typing "Except for Amiga OS" 🤣🤣🤣... so true 😉, keep up the good work👍 and all the best🙂
I've been sysadmining for about 15 years and I had always assumed this was a FUSE utility and didn't bother to look at it. I'm sad that I didn't pay attention to it much earlier but very happy that I know about it now. Thanks for sharing.
I have used Linux om servers for 25 years, and on desktop for 20 years. And did not know that command. Now I just have to remember the first time i need it and it will be a fantastic tool! Thank you!
Veronica, I find your style, your humour (which I really appreciate), and the hard work you put into your editing -- well, I find that I am absorbing what you are teaching. Rare that I can sit back and be passive and just watch a video and just absorb. Thank you for doing what you are doing. If imitation is the greatest form of flattery, than consider yourself being very flattered. Your pacing is fantastic. No, not fantastic. Sublime. You slow down, but not in a monotone way, and not in a way that sounds like you are going at 3/4 speed, and not in a way that sounds like you are talking down to us. It must be harmonics or something because your pace of talking matches my pace of listening. I think you have a special ability to slow down your talking, without going into a monotone. The flip side would be the ability to talk faster without sounding like you just went to 1.5x. Something that you do well, that I have taken especial note of, is that you pause. You take that extra beat of pausing, without sounding like you are creating white space. I do not have that talent. The funny thing about you shooting your videos in your unfinished basement is that there are no distractions. I think you should earmark a piece of your basement as "The Stud Room" (even if it is not really a room), and continue shooting your videos there. No LED lights, no worrying about having the right wallpaper on your screens, no worrying about keeping it clean, no worrying about what is on the wall. These small "L'il" videos are brilliant, and effective. I appreciate you recommending other KZread creators. They should be recommending you, not the other way around. I am a "lazy liker", and have been remiss "liking" your videos. I will rectify this in the future with your videos. All my best from Toronto, Canada.
I have been using Linux since 1999...I was today years old when I learned about this tool. Thanks for expanding my toolbox!
I've been using Linux every day for a decade now and the only "fuser" that came to mind was "fusermount" Thanks for teaching me new stuff
Very cool. I've been using Linux for nearly 30 years and didn't know what to use 'fuser' for. I've been using 'lsof' but it's a bit more arcane. From now on 'fuser' will be in my toolbox. Thanks. 😊 Rockin' on with that outro: 🤘😝
I'd forgotten about fuser in favour of lsof. Linux is awesome because there are so many ways to do things, but it's easy to fall into bad habits as well.
@atoomnet
9 ай бұрын
I never knew of fuser, always uses lsof.
5:46 You said it..! Using Linux since 1999, many Linux commands happened to be like that for me, like a screwdriver, such tools becomes absolute necessities once started using.
I'm a seasoned Linux and Unix user (going back to the '90s), well over a decade of that as a sysadmin. I like watching these "basics" videos (for all kinds of topics) to get a fresh perspective on things¹. You did a really good job with this video! ¹ For example, simply out of habit I've usually used *lsof -n | grep PATH* . This has worked fine in the past but this is severely broken² on the latest Ubuntu release. I've been planning to look into this but as you mentioned *fuser* can be a good substitute in a lot of cases. ² For some reason (I suspect it's something to do with *snap* , _et al._ ) there is a substantial delay before *lsof* (without *-p* ) outputs anything. For example, on my current desktop *lsof* takes a whopping 30 seconds before outputting anything whilst *fuser -v PATH* only takes ~220 ms. (Running *lsof -p PID* runs fast, ~130 ms.)
Veronica, thanks for making complex things seem simple and fun! You are one of the best educators on KZread! Love you!
Awesome! I've used Linux and other Unix systems for 6 years this fall and wonder how I could've missed such a useful command. Great video as always :D
I've been a linux user since, well, since linux. I can't believe it took me this long to stumble accross your channel. Well guess whos added to the long list of channels I now watch? Thanks again.
Lovely edutainment video! Thank you for creating content like this.
You're a great educator Veronica! I love your tone and purpose!
so much quality in this content. excited to explore the rest!
That sounds super-useful! Thanks, Veronica!
It is about time you uploaded. 😇 Thank you!
Welcome back, Veronica! Thanks for the lesson as always, Linux Mom! 😊
Wow great video, I just found your channel; I switched to Linux for all of my personal computers 2 years ago and had no idea about fuser, definitely a great explanation/demonstration, and will be adding this to my workflow when needed!
Thanks for the pointer to Jay's vid. His channel (and this one, of course) has been super useful in my linux ed.
Thanks for opening my eyes to fuser. Just subscribed. Veronica is my new hero.
Veronica, thank you for your lucid and meticulous explanation of fuser. You helped me imporove my command-line skills. Thank you. I have subscribed to your channel.
Thank you ma'am. This goes into my 'share to others when needed' list as is succinctly explains the what command is available and how to use it.
This is so timely. I was just trying to reinstall something on my server and learned about the fuser command for the first time ever nary a few days ago. BTW, thank you for all your great vids, Veronica!
Thank you Veronika for the lil tutorial, it is very nice to enjoy a brief tutorial of hidden gems like these on break or breakfast while sipping a cup of coffee/tea. Please do more of these brief tutorials ❤
Great as always! Ty for teaching us.
you are AWESOME! I never knew this command but I often needed it 🙂
You clear articulation is honey for my ears!
Thanks for the video! I hadn't run across this command previously, and it looks a lot more friendly than mixing `ps` flags and grepping through the output.
That was really cool. I don't think I'll need it often but when it happens I'll be glad to know this exists
Great job on this _fuser_ video. Cannot wait for your _lsof_ video too!
Great little video. I'd forgotten about fuser. 👍
YES! I agree! Amiga OS / Workbench is perfect! 🙂 Thanks Veronica, for another, as always, great video.
Good to know there's fuser! I was using lsof the whole time because that's the tool for Solaris systems and I still got used with lsof for such usage. I didn't know about fuser.
ooh how cool! I'm a self taught linux user for a few years now, didn't know about fuser and I've had this exact problem more than once :) Thank you!
Loving you videos. Really good stuff.
Another excellent video! Thanks Veronica! :-)
man fuser 😂 You make it all very clear and thanks for the video. The algo is getting better at making recommendations to me. Subscribed.
To think I've used lsof since forever.. 25 years of Nix system administration and this was a new one to me. Thanks so much for the tip!
I learned something new today... again. Thank you :)
Even more videos with the same kind of content is very much appreciated 😊🙏🏻
Loved the Amiga OS shoutout!
Found you randomly today in KZread recommended. Great content, great editing!
Thanks for this. I've run into flash drive issue multiple times. Now I'm aware of a better solution.
When you said "f user", I thought it was a command that destroyed the user.
@jedahn
Ай бұрын
It destroys their self confidence.
Great video, loved it! Nice to know about fuser, I didn't know about it before.
That was a rly nice video, keep going, great content.
Hi Veronica, great video! I subbed a while back, but this is the first time I've seen this series - and it prompted me to support your Patreon. I've been a Linux dabbler for a long time but without enough persistence to get deep into it, and this short-form dive is a good tool for me to gradually build my knowledge. Thanks again!
@VeronicaExplains
9 ай бұрын
Thank you! I very much appreciate it. I'm planning a bunch more once this basement space is wrapped up!
@SahilP2648
9 ай бұрын
@@VeronicaExplains but Linux or rather any OS should just give you an option to 'Show details' or 'Expand' on the UI to get more information about the processes or files open and maybe even an 'X' button to close them directly from that one pop-up. Someone should create a PR for it. I could have if I knew anything about it (I am an Android app developer).
Thanks Veronica! You taught me a few things here.
I love the fact that no matter how much I think I know as someone who has dabbled in linux since the late 90's that there is always something new to learn.
So pleased you call sudo "suedough" and and "sue dooo" - Small things I know, but they make me happy :) Love your vids by the way !!
Thanks for this, neat command!
Amazing, Imma use this fuser command a whole lot!
Super useful! In the past I always ran lsof through grep to try to find what was holding a file open.
I started to learn Linux as a dev more years ago than I care to mention. But I've never been a sysadmin, and this kind of thing is invaluable. I didn't know fuser nor lsblk! I get by with lsof, but it's never ideal. Powerful but quirky. These tools will undoubtedly be very helpful. Thanks!
Very useful! Thanks for the overview.
You are spot on, most take 10 years to learn how to close vim, 15 to be fairly sure you know. I am on my way to get there!
The AmigaOS argument made me instantly subscribe
thanks for your great work here !
Fuser is so awesome! Just subscribed !
At my first job we used to use fuser. It was not allowed for the same user to be logged in at the same time. The problem was when the user was left hanging in the system and could not log in again because there was already a session started. We used a fuser -ku /dev/TTY Usually, we looked for the user's TTY within a script and passed it as a parameter to the fuser. By the way, I love the way you Speak English.!!!!!! Greetings from Mexico
love your perky delivery style!! You are the sysadmin I wish I had. Subscribing.
Excellent tip. Funny, but I call it fuser (not f-user) - it's just easier that way. Awesome vid.
Loved the Wow! reference!
Good one! I've always used lsof. I didn't know about fuser. I like that it can tell you who has ports open too.
This is *such* a great video!
Love your videos! 🙂
very useful ..thank you Veronica
Oh cool :) I've seen fuser about but had no idea what it did. Thanks for clearing that up!
Woah. I am by no means a Linux newbie, and yet, I did not know much about fuser. Good tips!
you got me so cracking up almost to the end of the Vid and Ty so much for this Vid Tips.
Great video and very informative!
I learned so much! Thanks for this 😀
3:32 True! *Almost* no operating system is perfect, except for that one! Hah! Enjoyed the Amiga plug, once again
Thanks! I have used fuser but only to do lazy unmounts. Now I know how to avoid them in the future!
Awesome video - you rock! I love Linux too!
Great tutorial 😊
1st video, from you, I watch and subbed
Great video. Thanks
Great video! I used to save data to an external HDD on Kubuntu, almost always, some running processes preventing the ejection. My solution was: lsof | grep /media and then manually kill based on pids.
Ok I give up you win: this video made me subscribe. Good job your content is very good and everyone around you should be proud!
Cheers! Brilliant tutorial! I feel like 90% of my computing experience (on all oses) would be better if I'd known about this tool. Imagine how many people have partial reimplementations of its functionality.
Cool! I've never used fuser despite running into these "device or resource busy" messages from time to time, sometimes checked that with lsof. At least I've got one more way to figure out what's going on. Thanks!
I'm used to using lsof for some of the tasks you mention here, like looking for tcp on a port to kill a hung process. Neat to see alternatives and how they might have other benefits. Thanks! Edit: Lol, I posted this before finishing the video and like 5 seconds later you mention lsof, rip. Really appreciate you!
Thank you for showing a new way to log out of my system.
I wasn’t sure whether to subscribe or not until I noticed the ‘Except for Amiga OS’ reference. Instant subscribe.
@VeronicaExplains
9 ай бұрын
I appreciate it! Now I just need to learn enough 68k assembly to be able to write some sort of crummy KZread client for Amiga. :)
"Except for Amiga OS" --- I love you.
I am awesome. Wow, thank you! So are you. Really lean something useful here, thank you so much.
You can exit vi with ‘:x’, it’s a shortcut for ‘:wq’. Just doubled your efficiency!