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Q&A

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

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66%
+2 −0
Where does GtkFileChooserDialog store bookmarks?

I have some bookmarked folders in GtkFileChooserDialog. I want to add these to my dotfiles. Where are the bookmarks stored?

1 answer  ·  posted 8mo ago by matthewsnyder‭  ·  last activity 8mo ago by Quasímodo‭

66%
+2 −0
Run a command *later*

How can I run a command later? I'm looking for a CLI way to schedule a command to be run later. I know that I could create a systemd timer, install it, activate it... That is too much work. I want...

2 answers  ·  posted 8mo ago by matthewsnyder‭  ·  last activity 8mo ago by Canina‭

66%
+2 −0
Highlight regions in an image with CLI

I have an image (a photo) and I want to highlight certain parts of this. I want to do this from the CLI. I am planning to store the pixel coordinates of polygon vertices in a file, and when I run ...

2 answers  ·  posted 8mo ago by matthewsnyder‭  ·  last activity 8mo ago by samcarter‭

71%
+3 −0
Treat underscores as word boundaries in terminal using vim mode

Question How do you specify underscores as Vim word boundaries when using vim mode in either bash or zsh? MWE w on this_word should place the cursor on the underscore. A second w should place th...

1 answer  ·  posted 1y ago by mcp‭  ·  last activity 8mo ago by r~~‭

60%
+1 −0
Starts systemd service and follow log

I can start services with systemctl start. I can see logs with systemctl status or journalctl. But by the time I run the second the process has already started. I'd like to start a service and imme...

2 answers  ·  posted 9mo ago by matthewsnyder‭  ·  last activity 8mo ago by AdminBee‭

71%
+3 −0
Internet connection and touchpad not working on Ubuntu 22.04 after a force shut down

After a force shutdown on Ubuntu 22.04, installed on a Lenovo Legion 5, the OS seems to have lost its ability to recognize the built-in touchpad or to connect to the internet. For the backstory......

1 answer  ·  posted 8mo ago by Mithical‭  ·  last activity 8mo ago by matthewsnyder‭

60%
+1 −0
Do I have to update Guix frequently like Arch?

Guix is a rolling release distro. Another well known rolling release distro is Arch Linux. In Arch, you are expected to frequently do system updates. Partial updates are not supported. In my exper...

0 answers  ·  posted 8mo ago by matthewsnyder‭  ·  edited 8mo ago by matthewsnyder‭

50%
+0 −0
Do you still need to update archlinux-keyring before pacman -Syu?

For some time pacman used to have a problem where: Occasionally Arch maintainers introduce new GPG keys They start signing packages with the keys Your local pacman doesn't receive these until ...

0 answers  ·  posted 8mo ago by matthewsnyder‭

50%
+0 −0
Low impact trial installation of Guix to test hardware compatibility

I like how Guix sounds based on what I've read, and I want to try it. However, my partitioning scheme is a bit complicated. With Guix it appears like my biggest concern is hardware (I will regretta...

0 answers  ·  posted 8mo ago by matthewsnyder‭

77%
+5 −0
Copy to clipboard from terminal with Vim bindings

Question How do I copy to clipboard from terminal with yy, assuming it's configured to use Vim bindings? I am using zsh with bindkey -v. MWE Enter something on the commandline (without pressi...

2 answers  ·  posted 1y ago by mcp‭  ·  last activity 8mo ago by Mithical‭

71%
+3 −0
What does `emerge --update --newuse --deep @world` have to do with package removal?

In Debian-based distributions, one can update the system with apt upgrade and cleanup unused dependencies with apt autoremove. Period. On Gentoo that is apparently not as straightforward. From G...

0 answers  ·  posted 2y ago by Quasímodo‭  ·  last activity 8mo ago by Mithical‭

71%
+3 −0
VPN tunnel for outgoing connections but still allowing incoming bidirectional connections, using Wireguard or OpenVPN on Linux

For a particular use case, I need to be able to set up a Linux host (specifically Debian) to use a VPN tunnel for routing outgoing connections, but still allow incoming connections outside of that ...

0 answers  ·  posted 2y ago by Canina‭  ·  last activity 8mo ago by Mithical‭

71%
+3 −0
Why do many Windows games fail when the network is sandboxed?

I run Windows games with Wine, and use bwrap to sandbox them. I've noticed that passing --unshare-net to disable the network breaks many, many games (they fail to start with no obvious error messag...

0 answers  ·  posted 10mo ago by matthewsnyder‭  ·  last activity 8mo ago by Mithical‭

60%
+1 −0
Postgres 15.3 fails to create new tablespace (could not set permissions)

I am unable to create new tablespaces on a fresh Postgres 15.3 installation on Ubuntu 22.04. I tried the following so far: re-install Postgres fully loosen file system permission disabled SELi...

0 answers  ·  posted 10mo ago by Luís de Sousa‭  ·  last activity 8mo ago by Mithical‭

71%
+3 −0
How can I show hidden files and folders (with leading dot in name) on the desktop (actual desktop, not a window)?

I am using Linux Mint 20.3, with Cinnamon as a window manager. I have a folder named .pytest_cache on my Desktop: $ ls -1A | grep '^\.' .pytest_cache I know that if I open a Nemo window, navi...

0 answers  ·  posted 9mo ago by Karl Knechtel‭  ·  last activity 8mo ago by Mithical‭

71%
+3 −0
how to determine from the command line whether a DVD is encrypted

I am currently ripping a bunch of DVDs. Some are encrypted, and some are not. My method for ripping a DVD depends on whether or not it is encrypted, so I am looking for a command-line method to det...

0 answers  ·  posted 2y ago by Trevor‭  ·  last activity 8mo ago by Mithical‭

dvd
60%
+1 −0
How to reduce DPI of external monitor using xrandr

Have I have the DPI on my laptop set in .Xresources with Xft.dpi: 192. I am outputting to the external monitor with: xrandr --output HDMI-2 --auto --rotate left --right-of eDP-1 Want I want ...

0 answers  ·  posted 1y ago by mcp‭  ·  last activity 8mo ago by Mithical‭

66%
+2 −0
How do I make media keys work with PipeWire?

My keyboard has keys for mute, volume up, volume down. In i3wm, I used to have these bound with: bindsym XF86AudioRaiseVolume exec --no-startup-id pulsemixer --change-volume +10 --max-volume 100 ...

1 answer  ·  posted 10mo ago by matthewsnyder‭  ·  last activity 8mo ago by Mithical‭

60%
+1 −0
How to create ed25519 subkey in GPG?

At the moment GPG only offers the following options when generating a new subkey the with the addkey command: gpg> addkey Please select what kind of key you want: (3) DSA (sign only) (...

1 answer  ·  posted 8mo ago by Iizuki‭  ·  last activity 8mo ago by Iizuki‭

50%
+0 −0
How do you eval SSH agent output in fish?

SSH agent prints some envar commands for sourcing in a shell. However, these are bash-style, and I use fish. Fish barfs at the bash syntax. How can I fix it?

1 answer  ·  posted 8mo ago by matthewsnyder‭  ·  last activity 8mo ago by matthewsnyder‭

50%
+0 −0
SSH key added to agent, but keeps asking for password

I have my key added to ssh-agent and they show up in ssh-add -l. When I try to actually SSH to a host that requires the key, I still get prompted for a password. I enter it again and again and it s...

1 answer  ·  posted 8mo ago by matthewsnyder‭  ·  last activity 8mo ago by matthewsnyder‭

50%
+0 −0
How to securely erase data from a thumb (solid state) drive

How do you securely erase data from a thumb (USB/flash) drive? With traditional (magnetic/spinny) hard drives, it used to be that you could use various tools to simply overwrite with random data, ...

1 answer  ·  posted 8mo ago by matthewsnyder‭  ·  edited 8mo ago by matthewsnyder‭

66%
+2 −0
How to change the default app for opening directories in Gnome?

I somehow managed to unknowingly change the default app for opening directories on my laptop. E.g. when I use the option open containing folder in a program like Evince, my editor (vscode) opens u...

2 answers  ·  posted 8mo ago by mr Tsjolder‭  ·  last activity 8mo ago by matthewsnyder‭

60%
+1 −0
What does Gnome Disks "erase" do?

When formatting drives with Gnome Disks, there is an option to "Erase". The help text says this takes longer, but "completely" erases data. What exactly does this option do? Is there a CLI equival...

1 answer  ·  posted 8mo ago by matthewsnyder‭  ·  last activity 8mo ago by mr Tsjolder‭

71%
+3 −0
How to debug NetworkManager issue after suspend/resume in Ubuntu 22.04

****Since upgrading to Ubuntu 22.04 recently, immediately after a reboot I have WiFi to an internet hotspot as I did prior to upgrading. After suspend then resume, the network is no longer working...

2 answers  ·  posted 10mo ago by happyborg‭  ·  edited 8mo ago by happyborg‭

50%
+0 −0
How to let systemd user unit see keys in SSH agent?

I have a script that does git fetch for a repository. When I run this in my shell it works fine. I want to run it in a systemd user unit. However, I am using an SSH url, and the systemd unit fails...

0 answers  ·  posted 9mo ago by matthewsnyder‭

60%
+1 −0
GUI apps stop working until next boot after some system upgrades

My system occasionally has an issue that looks like this: I run pacman -Syu Many things get updated Many GUI apps (including all display managers and Xorg) start refusing to run and throw up O...

1 answer  ·  posted 9mo ago by matthewsnyder‭  ·  last activity 9mo ago by mr Tsjolder‭

66%
+2 −0
What does the "Valid" column mean in the output of "faillock"?

I was looking into unlocking my login after too many incorrect password attempts. I found this post about it. Doing faillock -user $(whoami) --reset did indeed unlock the login. However, what exac...

1 answer  ·  posted 9mo ago by matthewsnyder‭  ·  edited 9mo ago by AdminBee‭

66%
+4 −1
Simplest way of stripping leading/trailing whitespace from file or program output

What is the simplest shell idiom for stripping leading and trailing whitespace from a file or program output? Ideally I am looking for the equivalent of trim or strip methods in some languages. Th...

3 answers  ·  posted 10mo ago by matthewsnyder‭  ·  last activity 9mo ago by AdminBee‭

50%
+0 −0
How to change keyboard layout without a DE?

I am running X on Arch Linux without a desktop environment, only i3. Sometimes I need to switch between typing in different languages. How do I switch my keyboard layout?

1 answer  ·  posted 9mo ago by matthewsnyder‭  ·  last activity 9mo ago by mr Tsjolder‭

71%
+3 −0
Increase incorrect login attempts before locking account

When I enter the login password incorrectly 3 times, my computer locks me out from attempting a login for 10 minutes. How can I increase the number of attempts?

2 answers  ·  posted 9mo ago by matthewsnyder‭  ·  last activity 9mo ago by r~~‭

66%
+2 −0
How to change the keyboard layout with Gnome and Arch linux?

My goal is to use a french AZERTY keyboard layout with Arch linux and Gnome desktop environment but use US English as "OS language". Note that I am also open to a "working" solution on any other d...

2 answers  ·  posted 9mo ago by zetyty‭  ·  edited 9mo ago by matthewsnyder‭

50%
+0 −0
How can I change the timeout after too many incorrect login attempts?

When I enter the login password incorrectly 3 times, my computer locks me out from attempting a login for 10 minutes. How can I change the timeout?

1 answer  ·  posted 9mo ago by matthewsnyder‭  ·  last activity 9mo ago by matthewsnyder‭

50%
+0 −0
Why does a reverse hexdump truncate the message?

$ echo "4c 6f 72 65 6d 20 69 70 73 75 6d 20 64 6f 6c 6f 72 20 73 69 74 20 61 6d 65 74 2c 20 63 6f 6e 73 65 63 74 65 74 75 72 20 61 64 69 70 69 73 63 69 6e 67 20 65 6c 69 74 2c" | xxd -r orem ipsum...

1 answer  ·  posted 9mo ago by TRiG‭  ·  edited 9mo ago by Canina‭

xxd
66%
+2 −0
How do I set up my own DNS on my LAN, with delegation of public domains?

I want to have a local DNS server on my home LAN, say at 192.168.1.123. All of my machines will use 192.168.1.123 as their only DNS server when connected to my home network. By default, my DNS ser...

1 answer  ·  posted 9mo ago by matthewsnyder‭  ·  last activity 9mo ago by Canina‭

dns
80%
+6 −0
What are the correct permissions for `~/.ssh/config`?

I got this message: Bad owner or permissions on /Users/rbiaa065/.ssh/config What should the permissions be to make ssh happy?

1 answer  ·  posted 9mo ago by wassied‭  ·  last activity 9mo ago by r~~‭

ssh
66%
+2 −0
Getting a Module Error When Running Pytest Even Though the Module is Installed in the Current Virtual Environment

Hello everyone, I am encountering an issue when running pytest in my virtual environment. Although I have installed the required modules in my virtual environment using pip, I am still getting a M...

0 answers  ·  posted 9mo ago by ShadowsRanger‭  ·  edited 9mo ago by ShadowsRanger‭

77%
+5 −0
What unexpected things can happen if a user runs commands expecting a text file on input lacking a file-final newline?

It is often taught that in Unix/Linux text files should end with newline characters. The reason given (orally) to me by various sources was that "some commands (such as wc) assume or require a newl...

2 answers  ·  posted 10mo ago by Lover of Structure‭  ·  last activity 9mo ago by tripleee‭

60%
+1 −0
How to start MariaDB (or MySQL) server on a WSL using systemctl?

When I try to start MariaDB server (same problem with MySQL) on a fresh Debian 11 install in a Windows Subsystem Linux (WSL) I got the following error: $ sudo systemctl start mariadb System has n...

2 answers  ·  posted 10mo ago by zetyty‭  ·  last activity 9mo ago by matthewsnyder‭

33%
+0 −2
Is PipeWire easier to use than PulseAudio? [closed]

I have always found PulseAudio to be difficult to use and overcomplicated. Recently I also discovered that it is written by Lennart Poettering, whom I dislike. I am now very motivated to use someth...

0 answers  ·  posted 10mo ago by matthewsnyder‭  ·  closed 10mo ago by Quasímodo‭

66%
+2 −0
How is the IPv6 link-local address calculated?

I was told that an IPv6 link-local address — typically starting with fe80:: — is derived from the interface's MAC address. Here are some instruction on how to do the conversion. But the conversion...

1 answer  ·  posted 10mo ago by Matthias Braun‭  ·  last activity 10mo ago by Matthias Braun‭

60%
+1 −0
PipeWire separates the audio of every program, how do I combine them?

I uninstalled PulseAudio and installed PipeWire. It seems like now, every application gets an independent audio configuration. When I go into pavucontrol I see "Spotify" where I configure the volu...

0 answers  ·  posted 10mo ago by matthewsnyder‭

66%
+2 −0
How to install mysql-server on Debian?

With Debian 12, it seems that mysql-server is not available in the "default" package distribution and thus, cannot be installed with sudo apt install mysql-server or sudo apt-get... (I know that ma...

1 answer  ·  posted 10mo ago by zetyty‭  ·  last activity 10mo ago by matthewsnyder‭

75%
+4 −0
How can I use SIGUSR1 or SIGUSR2 without risk of terminating the process?

SIGUSR1 and SIGUSR2 are user-defined signals. Imagine there is a tool designed to do something useful upon receiving one or the other. The problem is the default action for these signals is Term (...

1 answer  ·  posted 10mo ago by Kamil Maciorowski‭  ·  last activity 10mo ago by Kamil Maciorowski‭

77%
+5 −0
Reverse shell with named pipe and netcat

This blog post describes a privilege escalation, exploiting tar's --checkpoint-action option. The privilege escalation is used to solve a TryHackMe challenge. The root user calls tar via cron whi...

1 answer  ·  posted 2y ago by Matthias Braun‭  ·  last activity 10mo ago by Kamil Maciorowski‭

83%
+8 −0
Are there any legitimate uses for newlines in filenames?

Unix is very permissive with filenames, and this can sometimes lead to a bunch of annoying corner cases when printing files. A well known example is when you put a newline in a filename, and it bre...

2 answers  ·  posted 10mo ago by matthewsnyder‭  ·  last activity 10mo ago by terdon‭

77%
+5 −0
Adding Python 3.11 to `$PATH`

I built Python 3.11 from source (from GitHub python/cpython branch "3.11"). Here is what I did (after downloading the repo as ZIP) cd Downloads 7z x cpython-3.11.zip cd cpython-3.11 chmod +x c...

2 answers  ·  posted 1y ago by HGStyle‭  ·  last activity 10mo ago by terdon‭

75%
+4 −0
Can I enter raw strings in fish to avoid escaping regexes for sed?

When running sed through fish, I often encounter a problem with regexes. Many commonly used regex control characters like []{}().+ need to be escaped, even if I type the regex in a single quoted st...

2 answers  ·  posted 10mo ago by matthewsnyder‭  ·  last activity 10mo ago by terdon‭

75%
+4 −0
Retrieve changes that closed a Debian bug

If a Debian bug number is referenced in the changelog of an uploaded package, it is automatically closed with a generic message: We believe that the bug you reported is fixed in the latest versi...

2 answers  ·  posted 1y ago by Quasímodo‭  ·  last activity 10mo ago by tripleee‭

57%
+2 −1
Download packages for full system upgrade without installing

I noticed that downloading all the pacman packages for a full system install takes a lot of time, so I want to create a systemd time that will periodically download them for me. That way, most of t...

1 answer  ·  posted 10mo ago by matthewsnyder‭  ·  last activity 10mo ago by terdon‭