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FreeCodeCamp/linux

This is the best place to discuss Linux and get help with it. Be sure to check out https://github.com/freecodecamp/freecodecamp/wiki/linux for more.

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Hussam Al-Tayeb

@ht990332

And tell your users not to delete random things. I went through this back in the windows 98 days when users deleted random DLL files.

As a system administrator, it is your responsibility to make scheduled periodic backups.

Agustin Jimenez

@agustinjimenez_gitlab

Hi guys! sorry about that. I looking for a friendship to sharing about linux, maybe software topics. Here my whatsapp:

+54 11 3368-9815

Sourav Goswami

@Souravgoswami

@hussamT, yes backup is one solution, but you know what, I charge for installing Linux, and I don't want to maintain computers of tens of neighbours and friends. Generally I don't, not a single problem occurred so far, I gave them pamac to update software, and there's every GUI alternatives. But one of them deleted the .config file even though I warned him some time ago...

BTW "the correct way to handle this is to use ext4 for the /home partition", why do you think EXT4 is better over XFS? XFS is faster than EXT4 in most cases, and even more robust than EXT4. I never had a single failure to XFS partition even after power losses, reset during laptop freeze. But some time ago, I had a Ok SD card for the raspberry pi, which also runs Arch Linux (ARM) on XFS. As you might know, if you keep your memory card for long without using it, data rot happens, that's what also happend with me, I had to just run xfs_repair /dev/sda2 (the root partition) to fix this problem.

XFS is the best FS, but after ZFS I think. But the problem is it won't let you shrink storage, but only grow (xfs_growfs) the file system. I am an XFS fan, so won't be using EXT4 unless there's a really good reason for that...

😀😃😄😁😆😅😂🤣☺️😊

@Vote4Buttcoin_twitter

Are there any people in here that are familiar with ElementaryOS?

Hussam Al-Tayeb

@ht990332

@Souravgoswami ZFS isn't upstream so it won't get enough testing. If you want to use XFS, and follow LKML guidelines, you have to stick to mainline kernels. With ext4, you can use LTS kernels( 4.4., 4.19, 5.4, etc...) safely.

Hussam Al-Tayeb

@ht990332

Regardless of the filesystem, if you are charging for installing Linux, it would be nice to provide support. I heavily patch desktop environments and kernels to fit specific use-cases and hardware. It's a pretty common thing to do periodic backups. Once a month should suffice.

Sourav Goswami

@Souravgoswami

Actually I compile Xanmod kernel for the needs of my customers, Xanmod kernel with (M) EXT4, (N) to EXT2 and EXT3, ZoneFS, etc. And (Y) for XFS, and disabled NUMA.

And I also use a lot of configuration that I already have. Most of the neighbours and people who use Arch now are basically noob, they don't care about a lot of feature, so... so far my custom configuration file compiled with CFLAGS O3 and -fno-plt, for x86_64, works just fine.

For me, I use -mtune=native and -march=native, never had any problem so far.

I use the default schedulers that xanmod provide... The Xanmod kernel really makes system faster, but being in performance governor, the system may use some extra battery power!

Buğra

@BgR8

hi, how should i download the packages to SD CARD?
i want to use this : https://github.com/dusty-nv/jetson-inference, don't have enough memory on Nvidia Jetson TX2, so i want to install libraries to SD CARD and want to do object detection etc.

onriv

@onriv

hello~

is that any reason a prcess start from such a low address?

docker? ld reallocated?

Christopher Jaeger

@caJaeger

When I do a systemctl start on a unit, does it use environment variables I have exported?

If it does, and the service crashes and restarts, are those variables still available to it?

Hussam Al-Tayeb

@ht990332

@caJaeger how did you set those environment variables?

If you set them just now and did systemctl start service, don't expect that to work.

if you want those environment variables to apply to the whole system, place them in /etc/environment.d/myvar.conf.

if you want them to be specific to that particular service, edit the unit file and add Environment=myvar=myvalue in the [Service] section.

Christopher Jaeger

@caJaeger

@hussamT That was my suspicion, thanks! I inherited a bunch of bash scripts that need updates and I am just trying to make sure I don't break anything. I didn't think services could ingest variables exported like that, but these scripts made me question myself!

Hussam Al-Tayeb

@ht990332

I would go for the last option

Christopher Jaeger

@caJaeger

Perfect, thanks! And thanks for the clarity, I am more confident with these changes now!

Hussam Al-Tayeb

@ht990332

https://www.freedesktop.org/software/systemd/man/systemd.service.html#Command%20lines

Christopher Jaeger

@caJaeger

@hussamT While you are here, I wonder if you have any idea how to accomplish something -

Say I have a variable defined in my shell. something=thing

How can I use the "env" keyword (or any method beyond export) to have that variable present in a child process if it's already set?

Hussam Al-Tayeb

@ht990332

the easiest way would be to "myvar=value childprocess"

Christopher Jaeger

@caJaeger

Right, but I already have the variable set elsewhere in the script

would I just myvar=$myvar childprocess? It seems redundant

Hussam Al-Tayeb

@ht990332

the child process should read it then as long as it was defined earlier.

Christopher Jaeger

@caJaeger

Oh I thought it needed to be explicitly exported to be read

Hussam Al-Tayeb

@ht990332

just childprocess will do

Christopher Jaeger

@caJaeger

huh. Okay, I definitely thought I had a handle on how that works but apparently not!

Hussam Al-Tayeb

@ht990332

here is a simple example https://pastebin.com/raw/9EkYkf7z

Hussam Al-Tayeb

@ht990332

now if you want your variables to be available only to the subcommand, you can wrap it in a function() and use "local myvar=value" then run 'function'

Carlos Valdez

@carlos_lvm_twitter

I have a question, is it possible to create interactive pdf forms with LaTeX?

Buğra

@BgR8

hi while i run the Yolo v4 COCO - WebCam 0: darknet detector demo cfg/coco.data cfg/yolov4.cfg yolov4.weights -c 0 terminal shows me GStreamer warning: GStreamer: pipeline have not been created and after that VIDIOC_QBUF: Invalid argument

or Yolo v4 COCO for net-videocam - Smart WebCam: darknet detector demo cfg/coco.data cfg/yolov4.cfg yolov4.weights http://192.168.0.80:8080/video?dummy=param.mjpg or another ip that android camera give and it shows me in red text "Connection to tcp://ipadress failed: No route to host and after that Video-stream stopped!

on Nvidia Jetson TX2