Introduction to System Programming in Linux (Early Access)

Link: https://nostarch.com/introduction-system-programming-linux
Discussion: https://news.ycombinator.com/item?id=43526763

#linux

Well, wake up from slumber, grab a cup of hot coffee ☕ and Frank Sinatra's number.

🎶 All My Tomorrows 🎶

#life #coffee #music #linux #research

.....and some rudimentary ritual ...

#linuxkernel #opensourcedevelopment #oepratingsystem

I used i3 for years on Ubuntu then discovered Regolith Desktop and haven’t gone back. The thing is, I’ve never encountered anyone else who uses it.

#FreeBSD #Linux #ArchLinux

I remember when I started messing around with Linux, it all seemed so hard and Arch Linux was the big bad bogeyman.

Now, years later, I use Arch Linux as my daily driver, and I am starting to learn FreeBSD. Curiously, I don't find FreeBSD to be as intimidating as Arch Linux seemed to be wayback then. However, it is a beast I want to tame. I am getting my ass kicked at every twist and turn. 🤣

Does anyone know how I can troubleshoot this?

I want my laptop display to not dim when the device is inactive. However, when I go into GNOME’s settings and uncheck the option under Power Saving my choice is disregarded; the screen still dims. Is it being overridden somewhere?

Fedora Workstation 41

Response to the recent claim that Ctrl+D in the terminal is like pressing Enter. It kind of is but it’s also misleading to say so without further explanation.

Bringing Record and Replay debugging everywhere on Linux

Link: https://github.com/sidkshatriya/me/blob/master/008-rr-everywhere.md
Discussion: https://news.ycombinator.com/item?id=43481652

#linux

While sipping hot lemon 🍋 tea 🫖 and having some FUN 😜

#linuxadmin #opensource #operatingsystem #linux #opensusue #fedora

The diversity of Linux distributions is one of its strengths, but it can also be challenging for app and game development. Where do we need more standards? For example, package management, graphics APIs, or other aspects of the ecosystem? Would such increased standards encourage broader adoption of the Linux ecosystem by developers?

Convert Linux to Windows

Link: https://philipbohun.com/blog/0007.html
Discussion: https://news.ycombinator.com/item?id=43518917

#linux

Well, wake up from slumber, grab a cup of hot coffee ☕ and Willie Nelson's number

🎶 You Were Always On My Mind 🎶

#life #coffee #music #linux #research

....and some rudimentary ritual ....avalanche!!

#linuxkernel #opensourcedevelopment #operatingsystem

Hi all!

I recently installed Tuxedo OS with KDE and Wayland. I’m fairly new to Linux and, so far, the distro is great. With one caveat.

As far as power options go, everything works fine EXCEPT for Sleep. I can put the PC to sleep, but when I wake it up, I land on the login screen wallpaper with the login/password fields barely visible, as if frozen around the second frame of a fade-in animation.

Nothing works. The mouse cursor doesn’t move, the keyboard doesn’t do anything. The only way out of this state is to hold the power button until the PC shuts down and then turn it back on again.

I did some digging, but couldn’t find a solution. Some threads mentioned modifying something in systemd, but those were from years ago, so I didn’t want to risk that.

One fairly recent thread had a proposed solution of adding mem_sleep_default=deep to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub.

That didn’t work for me, though.

I’d love to fix this, but I’m out of ideas. Any help welcome!

Vramfs: Vram Based Filesystem for Linux

Link: https://github.com/Overv/vramfs
Discussion: https://news.ycombinator.com/item?id=43517234

#linux

Here is this week's #Linux & #OpenSource News video:

https://www.youtube.com/watch?v=weFVHVPynRI

I want to move a directory with a bunch of subdirectories and files. But I have the feeling there might be some symlinks to a few of them elsewhere on the file system. (As in the directory contains the targets of symlinks.)

How do I search all files for symlinks pointing to them?

Some combination of find, stat, ls, realpath, readlink and maybe xargs? I can’t quite figure it out.

Hey there I am another refugee from windows with the forced push to windows 11. I thought it was time I tried once again linux. So far I am pretty satisfied.
I installed Fedora with KDE and successfully migrated my syncthing server, sftp server. Correctly mounted my nft disks and successfully installed mullvad with all split tunneling I needed.

Now I need advices about 3 things which I sorely miss and which keep forcing me to boot on windows :

• is there any equivalent to macrium reflect, allowing to schedule weekly image backup for system disk. So it could be restored in case something really goes wrong.
  My system disk is brtfs. Time machine looks nice but it’s not working because I have no @home and @root volume identified. I found explanations which explain how to do it but I am not too sure it’s a good idea to do so.
  I also found rsync. Didn’t explore enough this solution but I am not sure an image backup can be done if system is running ?
• for vscode it’s easy and I got it running for my linux environment. Yet I have programs which are meant specifically to run on windows and so I can’t develop and test them on linux
• at last for my work I need to be able to use excel. Libre office is not a solution, it’s ok for basic usage but it’s far behind if you’re using it professionally. Please don’t turn this about an arguments to say calc is good, really there is something that are just impossible with it. (Like using arrays, power query or data models)

For the last 2 points I feel like my only solution would be to use a virtual machine running windows. Is there a way to run them on it but make it looks like it’s a linux app? Somewhat is it what docker is doing but for linux apps ?

Well I feel like I have not many options if I want excel and vscode on windows environment. So sadly I think that will settled it. Please share your thoughts.
I would also really appreciate people sharing what they do to backup their system disk.

Thanks for your advice !

So I want to type in my native language, and the easiest tool i know of is this:

www.google.com/inputtools/try/

It’s not available offline for Linux though. I have tried running some windows executable from archive.org under wine, this didn’t work. I also tried some random alternative, but it was way too complex of a setup for me.

Well, wake up from slumber, grab a cup of hot coffee ☕ and Mark Knopfler's number

🎶 Summer Of Love 🎶

#life #coffee #music #linux #research

.....and some rudimentary ritual ....avalanche!! as usual :)

#linuxkernel #opensourcedevelopment #operatingsystem

I’m moderately experienced with linux. Been using it as my daily driver since 2018. Mostly using Fedora but also have a Debian server. I’m pretty comfortable with systemd but don’t love it.

Anyway, I’ve decided that I’d like to try Arch. So I’m looking for tutorials to help me learn or get familiar with Arch instead of just diving in.

So what Arch tutorials do you like and are there any that you’d recommend that I watch?

I know Gnome is the default on popular distros: Fedora, Ubuntu, Rhel, Pop OS (it’s Cosmic Desktop yes but it is still based on Gnome)…etc. But Gnome just doesnt work for me. I would pick XFCE - stable and no BS.

Before Manjaro and their cetificate shenanigan, I used to use their XFCE version. At the time, it was marketed as the “Flagship Manjaro version”. I went 4 years without any problems and I did tinker a lot, just couldnt get their XFCE to break.

After a tough Arch or Gentoo installs, I just want to put XFCE on and call it a day.

What about you guys?

Hey all.

I’ve booted Linux Mint Debian Edition and Arch on to a couple old machines including my old laptops. The performance is still rather brutal because these machines are so old and their battery lives are rough. They are also bulky and uncomfortable to carry around.

So, I’ve been thinking about getting a more modern laptop and putting Linux on it but I’ve been out of the laptop market for so long now I have no idea what’s good and what’s not anymore. Any recommendations?

I think I’ve heard decent things about Chromebooks but how’s the hardware of those? Are they relatively locked down and don’t play nice with Linux? I’m just looking for a machine for daily use (browser, light coding, remote connecting to my desktop for heavier stuff)

Thanks in advance

cross-posted from: lemmy.wtf/post/18741487

Hello!

I am pleased to announce a new version of my CLI text processing with GNU awk ebook. This book will dive deep into field processing, show examples for filtering features, multiple file processing, how to construct solutions that depend on multiple records, how to compare records and fields between two or more files, how to identify duplicates while maintaining input order and so on. Regular expressions will also be discussed in detail.

Book links

To celebrate the new release, you can download the PDF/EPUB versions for free till 06-April-2025.

• learnbyexample.gumroad.com/l/gnu_awk
• leanpub.com/gnu_awk/c/free

Or, you can read it online at learnbyexample.github.io/learn_gnuawk/

Interactive TUI apps

• 80+ exercises: github.com/learnbyexample/…/AwkExercises
• Brief tutorial: github.com/learnbyexample/TUI-apps/…/AwkTutorial

Feedback

I would highly appreciate it if you’d let me know how you felt about this book. It could be anything from a simple thank you, pointing out a typo, mistakes in code snippets, which aspects of the book worked for you (or didn’t!) and so on.

Happy learning :)

*limit the whole virtual address space for the process.*
This is nice and easy but not fully correct. We can’t limit whole virtual address space of a process to 1 MB – we won’t be able to map kernel and libs.

Second is to limit heap size. This is not so easy and seems like nobody tries to do this because the only reasonable way to do this is playing with the linker. But for limiting available memory to such small values like 1 MiB it will be absolutely correct.
Kernel space is flagged in the page tables as exclusive to privileged code (ring 2 or lower), hence a page fault is triggered if user-mode programs try to touch it. In Linux, kernel space is constantly present and maps the same physical memory in all processes. Kernel code and data are always addressable, ready to handle interrupts or system calls at any time. By contrast, the mapping for the user-mode portion of the address space changes whenever a process switch happens
#linux
https://alex.dzyoba.com/blog/restrict-memory/
https://manybutfinite.com/post/anatomy-of-a-program-in-memory/

Well, wake up from slumber, grab a cup of hot coffee ☕ and Glen Campbell's number

🎶 Gentle On My Mind 🎶

#life #coffee #music #linux #research

...and some rudimentary ritual ....as usual ....avalanches :)

#linuxkernel #opensourcedevelopment #operatingsystem

If you run a #Linux program in #strace, usually the start of the log shows it trying to load a ton of shared libraries, and for each one, trying the same file name in all your LD_LIBRARY_PATH directories until it finds it. So you mostly see file-open operations _failing_, with ENOENT.

To a novice strace reader, it looks as if something has already gone horribly wrong! But it hasn't – this is all normal, and as expected. Each of those ENOENT is technically "an error", but not a _bad_ error, because ld.so just moves on to the next in its big list of things to try, and one works in the end.

Errors happen _all the time_ in the guts of a computer system, and most of them are not even interesting – just business as usual. The event an end user thinks of as "an error" is the case where the program _doesn't_ have a fallback plan. Those are often outnumbered by the cases where it does!

I have been using KDE for a while, while I like many features I am looking for suggestions to the default email client:

Kmail - completely unusable for me and the only one which could maybe be integrated with kontacts, it could not receive mails from IMAP or pop or would receive only sometimes

Geary - good but too minimal, I need at least some kind of contact list and mailing lists feature, maybe this integrates with gnome contacts? I couldn’t find anything in settings

When I bought the XEphem ephemeris and planetarium program in the 1990s it was the first astronomy software I used on Linux.

Now available as open source, it is still as advanced as back in the day with features few similar programs have. With its Motif user interface frozen in time and now turned retro, here is XEphem on my Linux Mint box where it still builds and runs fine. Almost permacomputing.

https://xephem.github.io/XEphem/Site/xephem.html

#astronomy #planetarium #linux

Alt...

Screenshot of the desktop of a Linux Mint Cinnamon PC. Aside from a horizontal taskbar at the bottom, most of the desktop is taken by 8 windows of an astronomy program. The program's user interface is based on the Motif toolkit and the windows show ephemeris, star charts, planetary globes, and other visualizations of astronomical data.

#linux Next update ...🐧

#linuxkernel #opensourcedevelopment #opratingsystem

would the performance be huge and be very awesome?? if i had a computer with the latest amd ryzen chip and with 4tb of ssd and 16gb of ram and installed lubuntu on it, what would happen?

has anyone ever tried this??

So I installed KDE Plama on my Arch Linux machine (paru -S plasma) but it came with flatpak which I don’t use so I removed it (paru -Rns flatpak-kcm), now after reboot the system become so unresponsive and some programs didn’t even start (I install all of my programs from the AUR) I had to hard shutoff every time it stop responding, So I’m wonder if flatpak is essential to Plasma functionally?

I’m trying, and struggling a little bit with getting the three items in the title setup the way that I want.

Running Arch.

I would like to run Radarr, Sonarr and SABnzbd all under the same user/group. My reasoning is that I (am just being overly particular) want any of the files created by those services to fall under the same owner/group. This is easy enough to accomplish by running systemctl edit service.service and adding the appropriate lines in the configuration for each one and saving it so the services run using the specified user/group.

The issue that I’m having is that the correlating folders in /var/lib/ have the ownership of the original users. I can manually change that ownership to the user/group I want but if I reboot the computer the SABnzbd folder ownership reverts back to default (the other two were doing the same thing but suddenly stopped and I’m not 100% sure why) or if the services get updated, the folders will also revert back to their default user/group.

Is there a way for me to enforce the ownership of those folders to the user/group that I have set to run the services regardless of them getting updated or the machine rebooting?

#Syd is a rock-solid application #kernel to sandbox applications on Linux>=5.19. Syd is similar to Bubblewrap, Firejail, GVisor, and minijail. As an application kernel it implements a subset of the Linux kernel interface in user space, intercepting system calls to provide strong isolation without the overhead of full virtualization. Syd is secure by default, and intends to provide a simple interface over various intricate #Linux #sandboxing mechanisms such as LandLock, Namespaces, Ptrace, and Seccomp-{BPF,Notify} https://gitlab.exherbo.org/sydbox/sydbox

gVisor implements the #Linux API: by intercepting all sandboxed application system calls to the kernel, it protects the host from the application.
https://gvisor.dev/

https://gitlab.com/christosangel/deshuffle

deshuffle is a terminal word puzzle game, written in Bash.

The simple aim is to put all the given letters in order to find the shuffled word against the clock. The time available after a number of words also reduces, so the game gets harder as it goes.

There is not only one solution to every puzzle. If the user find a word with the same letters, the solution will be accepted.

By default, the adjusted definitions of the words appear in the end of each round.

The game ends when the user fails to find the word in time, or fails to create an acceptable solution altogether.

If the score is among the 10 best scores achieved, it makes it in the Top Ten Highscores.

This game was inspired by https://wordnerd.co/23words/.

Alt...

deshuffle, word puzzle against the clock (Bash)

www.youtube.com/watch?v=p6NnKHzHC1s

Alt...

BTCTurboMiner Made Me $500 in 3 Hours ( Here’s Proof )

www.youtube.com/watch?v=p6NnKHzHC1s

Alt...

BTCTurboMiner Made Me $500 in 3 Hours ( Here’s Proof )

Building a Linux Container Runtime from Scratch

Link: https://edera.dev/stories/styrolite
Discussion: https://news.ycombinator.com/item?id=43486997

#linux

www.youtube.com/watch?v=p6NnKHzHC1s

Alt...

BTCTurboMiner Made Me $500 in 3 Hours ( Here’s Proof )

www.youtube.com/watch?v=p6NnKHzHC1s

Alt...

BTCTurboMiner Made Me $500 in 3 Hours ( Here’s Proof )

www.youtube.com/watch?v=p6NnKHzHC1s

Alt...

BTCTurboMiner Made Me $500 in 3 Hours ( Here’s Proof )