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Q&A

General Q&A about Linux and Unix-like operating systems

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How to debug audio issues with JACK on Linux

I am trying to debug an issue with audio playback in MuseScore. During this process, I realised that I had/have no clue about audio playback in Linux (or in general for that matter). I already le...

0 answers  ·  posted 3h ago by mr Tsjolder‭

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ldapsearch: how to ignore certificate?

How to ignore server certificate when using ldapsearch command-line tool? Of course this isn't something you should be doing regularly, but it would be a handy asset for troubleshooting.

1 answer  ·  posted 8h ago by Iizuki‭  ·  edited 8h ago by Iizuki‭

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Find out which process is using a port

Sometimes your programs fail because the network port they are trying to use is already in use by some other process. How to find out what this other process is?

1 answer  ·  posted 1d ago by Iizuki‭  ·  last activity 1d ago by Canina‭

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What is synchronization in Wine?

Wine has options for "Synchronization", like "Esync" or "Fsync". What do these actually do? What is the purpose of such an option? What is the impact to normal usage of a Windows program in Wine?

1 answer  ·  posted 21d ago by matthewsnyder‭  ·  last activity 1d ago by matthewsnyder‭

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+1 −0
An alternative to pacman sudo nag?

Some pacman functions require sudo. When I forget the sudo, you get: error: you cannot perform this operation unless you are root. I then have to press the keys: up, home, s, u, d, o, space, en...

2 answers  ·  posted 1mo ago by matthewsnyder‭  ·  last activity 5d ago by TowerOfTurtles‭

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Why does Linux use the sudo command?

Why does Linux use the sudo command?

1 answer  ·  posted 16d ago by catexotica‭  ·  last activity 7d ago by matthewsnyder‭

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+1 −0
How to use the gitignore file without git(1).

How can a file list be manually filtered with a gitignore file. I want to do the equivalent of git ls-files, but it should work even if I remove .git, so I can't use git(1). Currently, I'm doing ...

1 answer  ·  posted 7d ago by alx‭  ·  last activity 7d ago by r~~‭

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How to count the lines of a file?

How to get the number of lines in a file? I.e. for a file like this: Line one Line 2 Final line I would like to do something like this: $ count-lines /path/to/the/file/above 3

2 answers  ·  posted 9d ago by Iizuki‭  ·  last activity 8d ago by Michael‭

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+6 −0
How to forward SSH access of one machine, through another, to the rest of a network?

I have a setup with two Raspberry PIs, a CM3 module with only a USB connection to the outside, and the Pi4 with a lot of connectors. I set up things such that CM3 functions as USB Gadget, and once...

3 answers  ·  posted 2y ago by CanisSomnolentus‭  ·  last activity 9d ago by Michael‭

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How to extract string from file, run filter, and replace in file with new value?

TASK I am coding up ebooks to a specific standard, and have a script that converts a string into the correct titlecase for this publisher. When working with some public domain source files, one of...

5 answers  ·  posted 3mo ago by David‭  ·  last activity 14d ago by catexotica‭

62%
+3 −1
init process play a role in the booting of Linux

How does the init process play a role in the booting of Linux?

2 answers  ·  posted 16d ago by trueframe‭  ·  last activity 15d ago by brew‭

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What is Kmail running in the background?

When I run Kmail on i3, and then close it, it appears to continue running some stuff in the background. For example, I periodically get notifications about new mail from dunst, even though I have c...

0 answers  ·  posted 18d ago by matthewsnyder‭

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How do you remap mouse buttons?

How can I remap buttons on my mouse, especially for more exotic ones like MMO mice?

1 answer  ·  posted 25d ago by matthewsnyder‭  ·  last activity 22d ago by Quasímodo‭

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Can rsync handle moves and renames?

Suppose I have a directory structure like ├── src │   ├── folder_a │   │   ├── file_w │   │   └── file_x │   ├── folder_b │   │   ├── file_y │   │   └── file_z and I back it up using rsyn...

1 answer  ·  posted 30d ago by Karl Knechtel‭  ·  edited 22d ago by Karl Knechtel‭

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Can I make a compressed RAM drive and externally prepare a (pre-)compressed file to copy onto it?

I don't know what these things are called exactly in the Linux world. But there is the concept of a drive in RAM, to write files onto and read them like it was any disk drive. There is also the c...

1 answer  ·  posted 2y ago by CanisSomnolentus‭  ·  edited 1mo ago by matthewsnyder‭

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+1 −0
How to find product and vendor names for xorg.conf

Problem How do I find product and vendor names for use with a xorg.conf file? Neither the xorg.conf nor the xinput manuals specify how to do this. xinput lists info, but the output lacks column ...

0 answers  ·  posted 1mo ago by mcp‭  ·  edited 1mo ago by mcp‭

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How to find user's id (UID)?

How to lookup user-id with the user's name? E.g. What's the UID of user linus?

1 answer  ·  posted 1mo ago by Iizuki‭  ·  last activity 1mo ago by Iizuki‭

uid
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+2 −0
Show a timestamp on the right side of prompt when executing a command in ZSH

How to configure ZSH shell to print a timestamp on the right hand side of the prompt line when executing a command? I don't want to display the time prior to executing a command. Here's about how ...

1 answer  ·  posted 1mo ago by Iizuki‭  ·  last activity 1mo ago by Iizuki‭

zsh
77%
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How do I safely replace brew on Big Sur?

I'm still trying to solve my problem with installing Ruby on a new Mac, and some discussions are saying that I need to reinstall brew because of the change from the old chipset to the M1. (I'm jus...

4 answers  ·  posted 2y ago by Monica Cellio‭  ·  last activity 1mo ago by matthewsnyder‭

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+0 −0
How to check spam headers of EML file from command line?

If I have an email in EML format, how can I determine its spam status from the terminal? My mail provider appears to insert a X-Acme-Spam-Status header. It looks like X-Acme-Spam-Status: v=1; e=b...

0 answers  ·  posted 2mo ago by matthewsnyder‭

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How to find your public IP address from command-line?

ip a command will conveniently show the addresses assigned to your network interfaces, but oftentimes this is not what the internet sees your machine as. So how to find your public IP address from...

3 answers  ·  posted 2mo ago by Iizuki‭  ·  last activity 2mo ago by Michael‭

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Albert with compositor surrounded by ghost of other windows

On Arch Linux, I installed albert (from AUR) and picom as the compositor. I am using i3 as the window manager. When I bring up the albert window, it is surrounded by the ghost of a window in the b...

0 answers  ·  posted 2mo ago by matthewsnyder‭

77%
+5 −0
How to RTFM well to get a CLI command

I've been met with the phrase RTFM often. I recognize its value. However, the manual pages are often hard to understand and written by people who know so much about the topic at hand that they don'...

2 answers  ·  posted 3mo ago by LAFK‭  ·  last activity 2mo ago by matthewsnyder‭

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+6 −0
Looking for a way to sync dotfile content between different machines without introducing security issues

I switch between three computers and have never been able to keep my dotfiles in sync. I cannot put them into source control because they contain sensitive data. So, my question is: how do I share ...

3 answers  ·  posted 3mo ago by paulsweatte‭  ·  last activity 2mo ago by matthewsnyder‭

60%
+1 −0
Is it safe to completely take over ~/.config/systemd/user?

~/.config/systemd/user intended purely for units created and managed by the user manually, or are there any automated processes that expect to control it? For example, do packages or programs ever...

0 answers  ·  posted 2mo ago by matthewsnyder‭

60%
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Can you put systemd units under a system path?

The systemd manual gives a list of path where systemd looks for unit files. However, I want to isolate my units in a path of my own choosing. Is it possible to configure systemd to add some path t...

0 answers  ·  posted 2mo ago by matthewsnyder‭

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+0 −0
Can I confine an executable inside a Docker container using a host apparmor profile?

I'm trying to containerize an application that currently uses apparmor to confine Python. This allows sandboxing of user-submitted code. How can I get docker and apparmor to play well together? Cu...

0 answers  ·  posted 2mo ago by much‭

75%
+4 −0
Debug NetworkManager with GDB

I'd like to debug NetworkManager by stepping through it using GDB. I assume I'll have to compile NetworkManager from source to get debug symbols since file /usr/bin/NetworkManager indicates that th...

1 answer  ·  posted 8mo ago by Matthias Braun‭  ·  last activity 2mo ago by Matthias Braun‭

66%
+2 −0
Modern and practical way to schedule tasks on a Linux machine that is not always on

What is a modern and practical way to handle scheduling tasks on a Linux desktop? Modern means basic features should not rely on obscure or convoluted commands and standards Practical means you...

3 answers  ·  posted 3mo ago by matthewsnyder‭  ·  edited 3mo ago by matthewsnyder‭

60%
+1 −0
In i3wm, how do I move a workspace with its windows to another screen?

In i3, is there a way to move an entire workspace to another monitor, including all windows it contains?

0 answers  ·  posted 3mo ago by matthewsnyder‭

60%
+1 −0
In i3wm, how to create affinity between screens and workspaces?

I have multiple screens and I often connect and disconnect monitors while the system is running. i3 assigns a workspace to each monitor, but does so unpredictably. Sometimes my main monitor is work...

0 answers  ·  posted 3mo ago by matthewsnyder‭

60%
+1 −0
In i3wm when moving windows, how do I also switch to the workspace if it's active?

Let's say I have workspaces 1, 2, 3 on screen A and 4, 5 on screen B. Currently workspaces 1 and 4 are active. With my current config, moving a window to another workspace never activates it. How...

0 answers  ·  posted 3mo ago by matthewsnyder‭

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+1 −0
In i3wm, how do I tell which screen is which workspace?

I have multiple screens and I often connect and disconnect monitors while the system is running. i3 assigns a workspace to each monitor, but does so unpredictably. Both workspaces are highlighted a...

0 answers  ·  posted 3mo ago by matthewsnyder‭

66%
+2 −0
Run pipeline in the background from git hook

I'm trying to run a pipeline to update a PDF after every push to the 'main' branch. I want it to be atomic, so it doesn't touch the existing PDF until it has finished, so I need to use sponge(1) (...

1 answer  ·  posted 3mo ago by alx‭  ·  last activity 3mo ago by alx‭

60%
+1 −0
Lynis says my /etc/issue is weak - how to strengthen?

When hardening my system with Lynis I had information about /etc/issue and /etc/issue.net being found weak. Lynis redirects me to Enterprise, which is a paid product and a bit overkill for my home...

1 answer  ·  posted 3mo ago by LAFK‭  ·  last activity 3mo ago by LAFK‭

75%
+4 −0
VISUAL=gvim makes crontab -e open a new crontab instead of a current one

My VISUAL setup interferes with my cron jobs. crontab -l works all right, I see my previous jobs. crontab -e, crontab -e -u user-here - opens GVIM on an empty file checked cron.allow or .deny,...

1 answer  ·  posted 3mo ago by LAFK‭  ·  last activity 3mo ago by Quasímodo‭

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+0 −0
How to see VRAM with inxi?

What switches do I need to add to see my video RAM (VRAM) with inxi? inxi -G shows my video card model and other info, but not video RAM.

1 answer  ·  posted 4mo ago by matthewsnyder‭  ·  last activity 3mo ago by matthewsnyder‭

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+1 −1
How to change resolution of virtual terminal?

How can I rescale the Linux virtual terminals (ctrl + alt + {f1, f2, f3, f4, f5, f6}), so that a high-resolution display doesn't make the letters too small? I'd like to use 1080 or even 720 resolu...

2 answers  ·  posted 4mo ago by alx‭  ·  last activity 3mo ago by Canina‭

66%
+2 −0
Alternating 2 keyboard layouts with Key Combination

Sorry it was a typo, _ instead of -, that caused the problem. I want to have a key combination to alter the keymaps. It worked with one for us and one for hu, but now I want to use one key combina...

1 answer  ·  posted 4mo ago by Arpad Horvath‭  ·  edited 4mo ago by Arpad Horvath‭

60%
+1 −0
How to prevent keyboard layout modifications from affecting external keyboards

Using For the console: /etc/vconsole.conf ---- KEYMAP=dvorak For X Session: .xinitrc ---- setxkbmap -layout us -variant dvorak & Problem For the console, it applies the dvorak lay...

0 answers  ·  posted 4mo ago by mcp‭  ·  edited 4mo ago by mcp‭

71%
+3 −0
How to invert command exit code?

How to apply a logical not to a shell command, e.g. in a Bash script? So if the command exited with 0 (success) I would like it to be changed to a non-zero value, and if it exited with a non-zero ...

1 answer  ·  posted 4mo ago by Iizuki‭  ·  last activity 4mo ago by Iizuki‭

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+5 −0
How can I restrict filename characters?

Suppose I want to limit what characters are allowed in filenames. For example, I want file creation to fail if there is a \n in the name. Is there a way to enforce this? If it matters, I prefer a...

2 answers  ·  posted 4mo ago by matthewsnyder‭  ·  last activity 4mo ago by Basile Starynkevitch‭

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+0 −0
Run command with Key Combination in Gnome

Is there a way in Ubuntu (22.04) to run a given bash command for a given Key combination in Gnome (42.9)? This Ubuntu is running in Hyper-V on a Win10 host. (I would like to run the setxkbmap us a...

1 answer  ·  posted 4mo ago by Arpad Horvath‭  ·  last activity 4mo ago by matthewsnyder‭

60%
+1 −0
How to fix the dark mode after the Gnome 1:44 update?

I recently updated Gnome to 1:44.0 and since the update my dark mode settings seem to be ignored for Gnome applications. When setting the dark style in Settings > Appearance, the desktop backgr...

1 answer  ·  posted 4mo ago by mr Tsjolder‭  ·  last activity 4mo ago by mr Tsjolder‭

60%
+1 −0
How to open a port in firewalld?

How to open a port when using firewalld as the system firewall?

1 answer  ·  posted 4mo ago by Iizuki‭  ·  last activity 4mo ago by Iizuki‭

60%
+1 −0
Rename multiple files which have a variable suffix

I compressed some JPEGs with curtail it messed up the filenames. It was supposed to only add -min at the end but ended up adding a random string after the extension 😠: prs@PC:/DOWNLOADS/Pictures$ ...

3 answers  ·  posted 4mo ago by Pr. Sunflower‭  ·  edited 4mo ago by matthewsnyder‭

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+4 −0
How to run a command on a list of files?

Suppose I have a list of files on standard input. These may be the output of find, cat filelist.txt or something else. How can I run a command on each file in turn?

3 answers  ·  posted 9mo ago by matthewsnyder‭  ·  last activity 4mo ago by alx‭

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+1 −0
How to tile multiple small page PDFs on a single standard size PDF?

Suppose I have a PDF which is 2x3 in. I want to create a PDF with a single page, which has multiple copies of this. For example, if the small pieces are in landscape, and the large page is in portr...

0 answers  ·  posted 4mo ago by matthewsnyder‭

pdf
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+1 −0
How to bypass SSH destination host key fingerprint check?

When you first connect to a host, ssh asks you about saving its fingerprint. If you do, on subsequent connections it will check the fingerprint and refuse to connect if it changed. I get that this...

1 answer  ·  posted 5mo ago by matthewsnyder‭  ·  last activity 5mo ago by Canina‭

ssh
71%
+3 −0
How to overwrite each line of STDOUT with the next one?

I wrote a filter program to overwrite each line with the next one. $ cat /usr/local/bin/ovr #!/bin/sh sed '2,$s/^/\x1B[1A\x1B[K/'; Here's the behavior: $ echo | ovr $ echo 'foo' | ovr ...

3 answers  ·  posted 5mo ago by alx‭  ·  last activity 5mo ago by Kamil Maciorowski‭