I have been using linux probably like 10 years ago and i like a fact, that you learnt it once and its preaty much same for another ten years. With windows, you have to move every single release to keep track of it. Thanks for cool videos! I really apriciate it! good job
For laptops I HIGHLY suggest Powertop, it's quite useful for extending battery life. Combined with TLP/TLPUI. It was a requirement for my ThinkPad, battery life is so much better after configuring TLP.
@@123sleepygamer Allows for better management of processor-related power consumption, doing things like managing the CPU frequency scaling and governor that by default TLP doesn't do (well)
Keep it up with this fantastic short-style of demonstrations - they can add so much value to people who are new to Linux. Don't stop with your advocacy for privacy and control of our own devices and data, that is also immensely valuable.
KILLALL(1) User Commands KILLALL(1) DESCRIPTION killall sends a signal to all processes running any of the specified commands. If no signal name is specified, SIGTERM is sent.
@@keyboardwarrior6296 damn. Kind of a misnomer if it's a command call kill all and it doesn't use SIGKILL. Oh well, I guess I was killing processes properly!
Fascinating! On sorting by CPU%, I find that 99% of the time, 99% of my CPU was being eaten by "baloo_file_extractor". On researching that, I find that it's part of KDE-Plasma's "file indexing" system. I don't need that, because I use descriptive file names and elaborate directory trees rather than using the OS's built-in "search" feature. (I think I used my OS's "search" features exactly 0 times in all of 2022.) So I went into settings and turned-off "file indexing". My average CPU use went from 99% to 1%, and my CPU's temperature, which has been holding steady on this computer at about 65℃ (idle) to 75℃ (watching videos) to 85℃ (when rendering videos in a video editor) for the past few months, instantly plummeted to 36℃ idle!!! So, yeah, in just 2 minutes of usage, "Htop" showed me how to drastically improve my computer's functionality and dramatically reduce CPU temperature.
Thank you for touching on such neat topics! As someone who is learning linux and planning to completely switch to it eventually, this really helps me out.
That's a very cool video idea. Most people use htop but it has so many features you never really notice. I randomly noticed I could customize the bar layouts after like a decade. But I do like GUI taskmanagers for their resource consumption graphs (bashtop is too slow). Glances would also be great if it was faster, I like all the sensors stuff. 10:46 F9,9 - As intuitive as it needs to be in a situation that requires it.
Happy to say that I've switched to linux as of today. I'm typing this on my new machine :) I also bought a Pine 64 and have been using it for projects thanks to you. That thing rocks!
Bro, this was really useful. I had it installed but was overwhelmed with all the options and I don’t know what to do and I rarely used it. Now I can become a more powerful user with your video. Thank you so much.
I personally really like btop.It's a bit more interesting, graphically, and has things like task filtering. I just checked and it even works directly under a TTY so Iike it.
I love HTOP so much and I have tried to learn everything about it so I have low expectations about learning anything but I believe it will still be an amazing video… I will watch it now and post my impression in a reply to my message hopefully I can learn one thing or two 😅❤🎉
I LOVE htop because it is GREAT software. You can tell that much thought went into every small detail. I dont know it this is the OCD of 1 person or small contributions of many, but the end result is fantastic.
htop is very, very useful. I use it a lot when I develop with C/CPP, just because it's easy to read for my eyes. For anyone starting with Linux, top will be your best friend.
11:18 Time to start up *Kill -9* by Monzy. Lyrics for anyone who doesn’t know: I guess I'll have to shut you down for good this time, Already tried a SIGQUIT, so now it's KILL DASH 9. You gotta learn when it's time for your thread to yield; It shoulda slept; instead you stepped and now your fate is sealed. I'll take your process off the run queue without even asking 'Cause my flow is like reentrant and preemptive multitasking. Your sad rhymes are spinnin' like you're in a deadlock, You're like a synchronous sock that don't know when to block; So I pull out my keyboard and I pull out my glock, And I dismount your girl and I mount /proc And I've got your fuckin pid and the bottom line Is that you best not front or else it's KILL DASH NINE. KILL DASH NINE, No more CPU time. I run KILL DASH NINE, And your process is mine. I run KILL DASH NINE, 'Cause it's MY time to shine So don't step outta line or else it's KILL DASH NINE! See it ain't about the Benjamins or Pentiums or Athlons, But you rappin' 50 meters while I'm spittin' in decathlons. Your shit's old and busted, mine's the new hotness; You're like CLR and I'm like CLRS. You're running csh and my shell is bash, You're the tertiary storage; I'm the L1 cache. I'm a web crawling spider; you an Internet mosquito; You thought the 7-layer model referred to a burrito. You're a dialup connection; I'm a gigabit LAN. I last a mythical man-month; you a one-minute man. It's like I'm running Thunderbird and you're still stuck with Pine, Which is why I think it's time for me to KILL DASH NINE. Yeah it's KILL DASH NINE No more CPU time. 'Cause it's KILL DASH NINE, And your process is mine. I said KILL DASH NINE 'Cause it's my time to shine, So don't step outta line or else it's KILL DASH NINE! My posse throws down like leaky bucket regulators; I was coding shit in MIPS while you were playing Space Invaders. With my finger on the trigger I run ./configure Yo, this package is big, but MY package is bigger. I roll my weed with Zig Zag while I zag-zig splay, And I do a bounds check before I write to an array. I'm a loc'd out baller writing KLOCS a day, 'Cause it's publish or perish, fool, what can I say? I'm 26 now, will I live to see 28? Some days I wonder if I'll survive to graduate. But hey, that's just fine, I won't ever resign, And if fools try to step then it's KILL DASH NINE! Yeah it's KILL DASH NINE, From my command line It's KILL DASH NINE Sending chills down your spine, I said KILL DASH NINE, 'Cause it's my time to shine, So don't step outta line or else it's KILL DASH NINE! fs sa rlidwka I'll chown your home and take your access away Comin' straight outta Stanford, ain't nobody tougher, Control-X, Control-C, I'll discard your fuckin' buffer. You're outside your scope, son, close them curly brackets, 'Cause I drop punk-ass bitches like a modem drops packets. Dump your motherfucking core, and trace your stack 'Cause where your ass is going, there won't be no callback. See my style is divine and my code is sublime, My career's in a climb and yours is in a decline. I'll write a pound-define and assign you as mine, So refine those sad rhymes or remove your plus signs, Or it's KILL DASH NINE, No more CPU time, 'Cause it's KILL DASH NINE, And your process is mine, I said KILL DASH NINE 'Cause it's my time to shine, Bitch you stepped outta line and now it's KILL DASH NINE!
Just changed my College Thinkpad from windows to Debian 11, had to setup some things that were done automatically in windows, but it has been nice so far. I loved the customization, btw can I use LxQt with gdm3 as a session manager without problems? It worked perfectly so far, but I read it could cause some problems
0:26 Anyone care to explain what the green bell pepper represents? (Why Stallman is wearing a Teddy Bear costume might warrant another question, but that didn't seem quite as unusual.)
I personally use btop these days (aka btop++) because of how heckin' polished it is. It used to be called bashtop, then later it became bpytop, and now it's just btop. There are lots of "top" programs, and while I've tried lots of them, I know I haven't tried all of them.
Nice introduction, had to immediately download it and try it! Just found out about nala, its a front end version of apt, and it really has some nice to have features like update history and so on. Would be cool if you could make a video about it since i barely see it talked about! :)
top was okay, htop was great, but then our Aussie Linux UA-camr Brodie showed me btop and I was sold. Why do I love btop? Just the nice CPU usage graphs, temperature readout is epic data to go fetch, and the ZFS support for IO means it is the best system performance at a glance tool I have.
I was hoping you would explain the other columns. I have a harder time understanding what those do like RES and SHR and why my memory bar is filled to the end but only half of the memory is in use
Remember that viewers cannot see what key you are pressing on your keyboard. Maybe I missed it, but when you were searching you did something and the search went away and the line was highlighted. What key was that? Enter? ESC? slash again?
Interesting. But why is Mr. Stallman wearing a bear suit and hugging a green chili pepper at 0:24? That seems like a very unlikely pair of things for him to be doing. More like something I'd expect from Jacob Collier.
low idle memory usage doesnt matter much compared to windows since windows reserves a percentage of your ram so if you have like 512GB of ram its gonna show idle ussage of like 64gb+ but it doesnt mean you dont have access to that ram anymore
On windows. Task manager used to be the single most powerful application. It ran in Kernel level 0, as long as there was ram, it would work. if it crashed, you just open a newone and the oldone will be killed. But over time some of the power is taken away, because people were doing stupid thing with it. Just because taskmanager could kill ANY program running, does not mean you should do it.
"But it's actually much better than a lot of the GUI task managers that you see on Windows or even the ones that are included in many of the just-works Linux distros." Since when does Linux have any GUI task manager that can hold a candle to the default one Windows ships, let alone include them? The best one I know of (thanks Brodie!) is System Monitoring Center which tries (and fails) to recreate Windows' task manager, but it isn't included in any distro by default.
Htop is one of those few programs that impressed me when I was clueless, and blew me away once I could use small parts of it
bpytop >> htop
Bpytop uses Python. Btop++ is the way
@@aaronryder4008 btop for bloat top. htop does everything that needs to be done
@@LC-mq8iq bloat is stupid, unless you are on 1gb of ram and a Pentium iii, nobody cares, btop++ just looks cool
@@broggl Found the Windows user.
Just recently moved from Win10 to Manjaro and this is really helpful. Superb guide and much appreciated!
I wish you a fun Linux journey. Glory to Arstotzka!
Also never try kali is just debain sh-t
I love Manjaro. Plasma desktop has been working well for me, and Arch is great about getting the latest drivers.
@@xmvziron Nice Papers, Please reference.
I wish you a fun journey and welcome to Linux
I have been using linux probably like 10 years ago and i like a fact, that you learnt it once and its preaty much same for another ten years. With windows, you have to move every single release to keep track of it. Thanks for cool videos! I really apriciate it! good job
For laptops I HIGHLY suggest Powertop, it's quite useful for extending battery life. Combined with TLP/TLPUI. It was a requirement for my ThinkPad, battery life is so much better after configuring TLP.
Have you tried auto-cpufreq?
@@brahillms1374 I have not, what does it do?
@@123sleepygamer Allows for better management of processor-related power consumption, doing things like managing the CPU frequency scaling and governor that by default TLP doesn't do (well)
@@down2006 Is it able to run alongside TLP?
@@DarkVeilGaming technically yes but you need to configure each program to not interfere with the other one
I love Htop for it making me look smarter than I am when I put it up on a screen to look cool.
you can't leave your pc looking boring, gotta open up 10 terminals with your cli application of choice
@@mushroomcrepes helps when I am also constantly letting everyone know I run arch Linux by the way.
@@thedoubleop im a super nerd.. i run guix linux with dwm.... :)
Long live btop++
More of a Atop Fan
Based
Gotop for the looks
Fancy looks, but totally meh in terms of functionality.
the b stands for bloat
Keep it up with this fantastic short-style of demonstrations - they can add so much value to people who are new to Linux.
Don't stop with your advocacy for privacy and control of our own devices and data, that is also immensely valuable.
I don't think he ever will stop advocating for that.
"You don't want to do SIGKILL often, only as a last ditch effort."
Me, who uses killall frequently:
KILLALL(1) User Commands KILLALL(1)
DESCRIPTION
killall sends a signal to all processes running any of the specified commands. If no signal name is specified, SIGTERM is sent.
Use killall with -SIGTERM, only if that doesn't work use -SIGKILL. This gives programs a chance to cleanup and save open work.
@@keyboardwarrior6296 damn. Kind of a misnomer if it's a command call kill all and it doesn't use SIGKILL. Oh well, I guess I was killing processes properly!
@@xmvziron RTFM, guy!
Ah yes, the nuclear option!
Htop is the game. I didn't know about the temperature feature, it's a nice addition. Thanks for giving that info.
Fascinating! On sorting by CPU%, I find that 99% of the time, 99% of my CPU was being eaten by "baloo_file_extractor". On researching that, I find that it's part of KDE-Plasma's "file indexing" system. I don't need that, because I use descriptive file names and elaborate directory trees rather than using the OS's built-in "search" feature. (I think I used my OS's "search" features exactly 0 times in all of 2022.) So I went into settings and turned-off "file indexing". My average CPU use went from 99% to 1%, and my CPU's temperature, which has been holding steady on this computer at about 65℃ (idle) to 75℃ (watching videos) to 85℃ (when rendering videos in a video editor) for the past few months, instantly plummeted to 36℃ idle!!! So, yeah, in just 2 minutes of usage, "Htop" showed me how to drastically improve my computer's functionality and dramatically reduce CPU temperature.
same except i had gnome-keyring and uninstalling it made my battery life go from 1-2 hours to like 9
Thank you for touching on such neat topics! As someone who is learning linux and planning to completely switch to it eventually, this really helps me out.
Why are you trans?
@@raizenxdd What? Who told you that? I am not trans lol
I just realized the only thing I use on windows is ventoy.
That's a very cool video idea. Most people use htop but it has so many features you never really notice. I randomly noticed I could customize the bar layouts after like a decade. But I do like GUI taskmanagers for their resource consumption graphs (bashtop is too slow). Glances would also be great if it was faster, I like all the sensors stuff.
10:46 F9,9 - As intuitive as it needs to be in a situation that requires it.
This video is amazing! It's a game-changer for htop users, thanks for sharing all the insights! Highly recommended!
Happy to say that I've switched to linux as of today. I'm typing this on my new machine :)
I also bought a Pine 64 and have been using it for projects thanks to you. That thing rocks!
Bro, this was really useful. I had it installed but was overwhelmed with all the options and I don’t know what to do and I rarely used it. Now I can become a more powerful user with your video. Thank you so much.
I personally really like btop.It's a bit more interesting, graphically, and has things like task filtering. I just checked and it even works directly under a TTY so Iike it.
Htop filters tasks when you press F4
bashtop is a good alternative as well, uses more RAM but looks pretty
bpytop
@@tonyvelasquez6776 btop++
@@sm_stormzy1075 htop
btop is the same thing, from the same author, but re-written in C++.
@@seanld444 ah, okay. is there any tangible difference?
I love HTOP so much and I have tried to learn everything about it so I have low expectations about learning anything but I believe it will still be an amazing video… I will watch it now and post my impression in a reply to my message hopefully I can learn one thing or two 😅❤🎉
The video was super interesting 🧐😅🎉 But due to some unrelated sleep deprivation I felt asleep 😴 and will need to watch it again… 😂
literally started learning about htop not long ago :)) this is great timing
That's cool, I was just reading up on this and you post a video, always appreciate your educational content to this day
Very useful video, thank you for making it!
I LOVE htop because it is GREAT software. You can tell that much thought went into every small detail. I dont know it this is the OCD of 1 person or small contributions of many, but the end result is fantastic.
great video as always brother, I love these little linux guides of yours!
I've been using htop for headless stuff over ssh but I just recently learned about btop which im now experimenting with.
htop is very, very useful. I use it a lot when I develop with C/CPP, just because it's easy to read for my eyes. For anyone starting with Linux, top will be your best friend.
Great for tuning and troubleshooting, been using htop for years.
I’m pretty impressed with btop, being very nice to look at. But thank you for the reintroduction to htop so I can manage processes better!
Very nice, htop needs more love.
Please do more videos like this.
In a pinch, you can actually reset niceness with a Ctrl+SysRq combination, if enabled
In 2006, when I was still not even in primary school, i got Mandriva Linux Pentium 4 pc. Glad to see some things don't change across the years.
Wow you must be really old
big fan of these shorter-style videos that cover the basics of useful *nix programs, often times man pages can be a bit opaque on main functionality
the first time I used htop, the first word that came to my mind was "beautiful"
I fixed a MacOS bug in this ages ago! Glad to see it getting some love, very convenient tool.
As I open your vidoe and right at the beginning there is no ad... this is a something I like most about you videos.
Ah yes, the nice little terminal task manager that appears in all hacker stock videos
The buttons on htop also support mouse input (clicking on them)
Very cool and educational video
Great job, pal! I realy love it too makes me feel like a software genius 😅
I like htop, and tend to use it more than top. Call me bloated XD
Nice video as always!
Very helpful. Thank you.
thanks for all the education kenny.
Love htop, great stuff
I love customizing htop and changing display mode to graph
Great piece of software. I install it on my servers by default among vim, ranger and tmux
Make more videos like that, it's great stuff!
2:15 this photo of Lisa caught me off guard and made me laugh lmao
11:18 Time to start up *Kill -9* by Monzy.
Lyrics for anyone who doesn’t know:
I guess I'll have to shut you down for good this time,
Already tried a SIGQUIT, so now it's KILL DASH 9.
You gotta learn when it's time for your thread to yield;
It shoulda slept; instead you stepped and now your fate is sealed.
I'll take your process off the run queue without even asking
'Cause my flow is like reentrant and preemptive multitasking.
Your sad rhymes are spinnin' like you're in a deadlock,
You're like a synchronous sock that don't know when to block;
So I pull out my keyboard and I pull out my glock,
And I dismount your girl and I mount /proc
And I've got your fuckin pid and the bottom line
Is that you best not front or else it's KILL DASH NINE.
KILL DASH NINE,
No more CPU time.
I run KILL DASH NINE,
And your process is mine.
I run KILL DASH NINE,
'Cause it's MY time to shine
So don't step outta line or else it's
KILL DASH NINE!
See it ain't about the Benjamins or Pentiums or Athlons,
But you rappin' 50 meters while I'm spittin' in decathlons.
Your shit's old and busted, mine's the new hotness;
You're like CLR and I'm like CLRS.
You're running csh and my shell is bash,
You're the tertiary storage; I'm the L1 cache.
I'm a web crawling spider; you an Internet mosquito;
You thought the 7-layer model referred to a burrito.
You're a dialup connection; I'm a gigabit LAN.
I last a mythical man-month; you a one-minute man.
It's like I'm running Thunderbird and you're still stuck with Pine,
Which is why I think it's time for me to KILL DASH NINE.
Yeah it's KILL DASH NINE
No more CPU time.
'Cause it's KILL DASH NINE,
And your process is mine.
I said KILL DASH NINE
'Cause it's my time to shine,
So don't step outta line or else it's
KILL DASH NINE!
My posse throws down like leaky bucket regulators;
I was coding shit in MIPS while you were playing Space Invaders.
With my finger on the trigger I run ./configure
Yo, this package is big, but MY package is bigger.
I roll my weed with Zig Zag while I zag-zig splay,
And I do a bounds check before I write to an array.
I'm a loc'd out baller writing KLOCS a day,
'Cause it's publish or perish, fool, what can I say?
I'm 26 now, will I live to see 28?
Some days I wonder if I'll survive to graduate.
But hey, that's just fine, I won't ever resign,
And if fools try to step then it's KILL DASH NINE!
Yeah it's KILL DASH NINE,
From my command line
It's KILL DASH NINE
Sending chills down your spine,
I said KILL DASH NINE,
'Cause it's my time to shine,
So don't step outta line or else it's
KILL DASH NINE!
fs sa rlidwka
I'll chown your home and take your access away
Comin' straight outta Stanford, ain't nobody tougher,
Control-X, Control-C, I'll discard your fuckin' buffer.
You're outside your scope, son, close them curly brackets,
'Cause I drop punk-ass bitches like a modem drops packets.
Dump your motherfucking core, and trace your stack
'Cause where your ass is going, there won't be no callback.
See my style is divine and my code is sublime,
My career's in a climb and yours is in a decline.
I'll write a pound-define and assign you as mine,
So refine those sad rhymes or remove your plus signs,
Or it's KILL DASH NINE,
No more CPU time,
'Cause it's KILL DASH NINE,
And your process is mine,
I said KILL DASH NINE
'Cause it's my time to shine,
Bitch you stepped outta line and now it's
KILL DASH NINE!
Kudos 👏 to you content...
Been using it since one of it first releases. An great tool for in the arsenal.
Just changed my College Thinkpad from windows to Debian 11, had to setup some things that were done automatically in windows, but it has been nice so far. I loved the customization, btw can I use LxQt with gdm3 as a session manager without problems? It worked perfectly so far, but I read it could cause some problems
Could you also do a intro to top? I've always been using htop because I really couldn't get how to use top.
i prefer bottom (ran with the command btm) quite a lot more :)
0:26 Anyone care to explain what the green bell pepper represents?
(Why Stallman is wearing a Teddy Bear costume might warrant another question, but that didn't seem quite as unusual.)
I believe the bell pepper is a test bitmap brush that ships with GIMP
the costume is a reference to an anime called serial experiments lain
Btw, you can restart your xorg using hotkey Ctrl + Alt + Backspace.
It worked all the time for me.
Incredible!
atop is a good one too. it shows disk io, networking, clock frequency, etc...
Cool! Thanks for the HTOP walkthorugh.
watching from the tor browser to escape the botnet :)
Logged in to comment, through Tor?
I use htop on Mac, but I have a question. Can Linux subsystem for windows run htop?
Great video Thank you
saw your thumbnail and said to myself "fuck, i love htop, hope nothing bad has happened"
Great video !
If you are back at linux tools short tutorials, maybe the Graphviz tools would be a good choice. Cool video!
OoOooo.....The command line! 🤯
there are people who said that htop is bloated compared to top? htop is very2 small, it uses barely more resource than top. what the hell...
Some guys are so resource oriented that an slightly lighter version makes it look like bloat to them
I personally use btop these days (aka btop++) because of how heckin' polished it is. It used to be called bashtop, then later it became bpytop, and now it's just btop. There are lots of "top" programs, and while I've tried lots of them, I know I haven't tried all of them.
Actually bpytop and btop++ are two different implementation of the same application. The bpytop is built using python and btop++ is built using C++
@@aaronryder4008 is there a big difference between them in daily use? I use bpytop but i hear most people use btop++
Would love a full video on btop !
Thanks for posting
Next show one on how To use top. It’s much less intuitive but you make the good point that people should know it anyways
Really nice👍
Nice introduction, had to immediately download it and try it!
Just found out about nala, its a front end version of apt, and it really has some nice to have features like update history and so on. Would be cool if you could make a video about it since i barely see it talked about! :)
top was okay, htop was great, but then our Aussie Linux UA-camr Brodie showed me btop and I was sold.
Why do I love btop? Just the nice CPU usage graphs, temperature readout is epic data to go fetch, and the ZFS support for IO means it is the best system performance at a glance tool I have.
excited for sysadmin breakdowns
Every time computers are in a movie and want to look cool. htop
Thanks, I'll be using this to debug my dying system.
Next I gotta learn how to use journal ctl
Threadripper is good for gaming, or that is industrial processor?
i recently started liking btop, just cause it looks way more modern, despite still being on the command line
My main gripe with good ol' top is that it was written way before multicore processors existed.
I would like a review of crowdsec, fail2ban, restic and wazuh(fork of ossec)
I was hoping you would explain the other columns. I have a harder time understanding what those do like RES and SHR and why my memory bar is filled to the end but only half of the memory is in use
There's also a way to configure the way htop looks like. It's very capable of eye-candy
Very good guide!
0:23 Can someone explain the meaning of the bell pepper here?
what is your opinion on the ethics of a data leak?
Remember that viewers cannot see what key you are pressing on your keyboard. Maybe I missed it, but when you were searching you did something and the search went away and the line was highlighted. What key was that? Enter? ESC? slash again?
i like bashtop more just because of its UI
great video
Theres another "tasks manager" called btop, which have a much nicer UI for beginners
Top 👍
I'm happy they added disk i/o to htop because iotop isn't in my repo for some reason and it lets me avoid installing something else.
Interesting. But why is Mr. Stallman wearing a bear suit and hugging a green chili pepper at 0:24? That seems like a very unlikely pair of things for him to be doing. More like something I'd expect from Jacob Collier.
htop has a vim keybinding version too!
low idle memory usage doesnt matter much compared to windows since windows reserves a percentage of your ram so if you have like 512GB of ram its gonna show idle ussage of like 64gb+ but it doesnt mean you dont have access to that ram anymore
On windows. Task manager used to be the single most powerful application. It ran in Kernel level 0, as long as there was ram, it would work. if it crashed, you just open a newone and the oldone will be killed. But over time some of the power is taken away, because people were doing stupid thing with it. Just because taskmanager could kill ANY program running, does not mean you should do it.
Having met with Hisham personally before, I'm glad that his program is getting more attention lately.
My 4 years of using htop can be boiled down to "is my server on fire? No? Okie bye ^C"
I wished I looked into it deeper
I like htop too 🙃
"But it's actually much better than a lot of the GUI task managers that you see on Windows or even the ones that are included in many of the just-works Linux distros."
Since when does Linux have any GUI task manager that can hold a candle to the default one Windows ships, let alone include them?
The best one I know of (thanks Brodie!) is System Monitoring Center which tries (and fails) to recreate Windows' task manager, but it isn't included in any distro by default.
Killing a parent doesn't kill the child process. It will leave the children as orphans, and they will be inherited by init to reap the zombies.