Today I Learned

Linux

Disable capslock

Short version (tested in ubuntu):

setxkbmap -option caps:none

Try creating the file 10-nocaps.conf with the following content:

Section "InputClass"
        Identifier             "keyboard-layout"
        MatchIsKeyboard        "on"
        Option "XkbOptions"    "ctrl:nocaps"
EndSection

…and place it in either /etc/X11/xorg.conf.d or /usr/share/X11/xorg.conf.d (depending on which folder your distro uses) and log out and back in again to test.

Creating a bootable USB using dd

Warning: This will irrevocably destroy all data on /dev/sdx. To restore the USB drive as an empty, usable storage device after using the Arch ISO image, the ISO 9660 filesystem signature needs to be removed by running wipefs --all /dev/sdx as root, before repartitioning and reformating the USB drive.

Tip: Find out the name of your USB drive with lsblk or lsusb and # fdisk -l to see the partition of the USB. Make sure that it is not mounted.

Run the following command, replacing /dev/sdx with your drive, e.g. /dev/sdb. (Do not append a partition number, so do not use something like /dev/sdb1)

# dd bs=4M if=path/to/archlinux.iso of=/dev/sdx status=progress oflag=sync

Tip: If the UEFI version of the USB’s Arch ISO hangs or is unable to load, try repeating the dd medium creation process on the same USB drive one or more times.

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Add suffix to filename

e.g to change the name of a file from old.name to old.name_backup:

mv old.name{,_backup}

Check the status of all services

$ sudo service --status-all

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Watch/capture webcam feed

$ ffplay /dev/video0

$ mpv /dev/video0

$ mpv av://v4l2:/dev/video0

$ vlc v4l2:///dev/video0

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How to install pass extensions

This guide refers to extensions for passwordstore.org: git clone https://github.com/browserpass/browserpass-native.git

cd browserpass-native

docker build -t browserpass-native .

docker run --rm -v "$(pwd)":/src browserpass-native browserpass-linux64

make BIN=browserpass-linux64 configure

sudo make BIN=browserpass-linux64 install

cp /usr/lib/browserpass/hosts/chromium/com.github.browserpass.native.json ~/.config/slimjet/NativeMessagingHosts/

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Edit a long command that you previously run

After you run the wrong command (or the one you wan to change) run fc. It will open a vim buffer and paste the last command you run.

Edit it and when you close vim, it will run the command.

Or, use zsh with vim navigation :)

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Hide tabs in firefox

Add a userChrome.css file
- Open your currently active profile folder
- Create a new folder named chrome
- Create a new text file inside the chrome folder named userChrome.css
- Set Firefox to look for userChrome.css at startup source

Add css rules to hide the bar:

#main-window[tabsintitlebar="true"]:not([extradragspace="true"]) #TabsToolbar > .toolbar-items {
  opacity: 0;
  pointer-events: none;
}
#main-window:not([tabsintitlebar="true"]) #TabsToolbar {
 visibility: collapse !important;
}
#main-window[tabsintitlebar="true"]:not([extradragspace="true"]) #TabsToolbar .titlebar-spacer {
     border-inline-end: none;
}

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Copying gpg keys between machines

On the source machine: gpg --export ID > public.key gpg --export-secret-key ID > public.key On the destination machine: gpg --import public.key gpg --import private.key

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Set 10 workspaces in popos

gsettings set org.gnome.mutter dynamic-workspaces false
gsettings set org.gnome.desktop.wm.preferences num-workspaces 10
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-1 "['<Super>1']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-1 "['<Super><Shift>1']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-2 "['<Super>2']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-2 "['<Super><Shift>2']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-3 "['<Super>3']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-3 "['<Super><Shift>3']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-4 "['<Super>4']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-4 "['<Super><Shift>4']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-5 "['<Super>5']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-5 "['<Super><Shift>5']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-6 "['<Super>6']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-6 "['<Super><Shift>6']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-7 "['<Super>7']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-7 "['<Super><Shift>7']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-8 "['<Super>8']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-8 "['<Super><Shift>8']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-9 "['<Super>9']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-9 "['<Super><Shift>9']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-10 "['<Super>0']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-10 "['<Super><Shift>0']"

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Enable right-click functionality for touchpad

$ sudo gsettings set org.gnome.desktop.peripherals.touchpad click-method areas

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Support md files on firefox

Firefox on Linux may not know how to handle markdown files by default. These mime types are stored in a file indicated by helpers.private_mime_types_file, by default it is ~/.mime.types. Create this file if it does not exist, otherwise edit it, and add the following line:

type=text/plain exts=md,mkd,mkdn,mdwn,mdown,markdown, desc="Markdown document"

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i3 with gaps and transparent terminal

i3-gaps

install dependencies: $sudo apt-get install gcc make dh-autoreconf libxcb-keysyms1-dev libpango1.0-dev libxcb-util0-dev xcb libxcb1-dev libxcb-icccm4-dev libyajl-dev libev-dev libxcb-xkb-dev libxcb-cursor-dev libxkbcommon-dev libxcb-xinerama0-dev libxkbcommon-x11-dev libstartup-notification0-dev libxcb-randr0-dev libxcb-xrm0 libxcb-xrm-dev libxcb-shape0-dev
install i3-gaps:
```
cd /path/where/you/want/the/repository
```

clone the repository

git clone https://www.github.com/Airblader/i3 i3-gaps
cd i3-gaps

compile & install

autoreconf --force --install
rm -rf build/
mkdir -p build && cd build/

Disabling sanitizers is important for release versions! The prefix and sysconfdir are, obviously, dependent on the distribution.
```
../configure --prefix=/usr --sysconfdir=/etc --disable-sanitizers
make
sudo make install
```

compton

$ sudo apt-get install compton && compton -bcf

b: run in background
c: shadow
f: fade config file sample

xfce-terminal

set transparency to 80%
set font to Fira Code 14
set colorscheme to Tango

How to run both the integrated and the dedicated graphic cards

xrandr --setprovideroutputsource modesetting NVIDIA-0
xrandr --auto

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Set default application with xdg

find out the MIME type string: $ file -i name_of_the.file
find out the name of the application .desktop file: $ grep "application_name" -l -r /usr/share/applications
make the assignement: $ xdg-mime default application_name file/type

Example:

$ file -i Broken_Blossoms.webm
Broken_Blossoms.webm: video/webm; charset=binary
$ grep "mpv" -l -r /usr/share/applications
/usr/share/applications/mpv.desktop
$ xdg-mime default mpv.desktop video/webm

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Add ssh key to remote server

ssh-copy-id -i ~/.ssh/id_rsa.pub YOUR_USER_NAME@IP_ADDRESS_OF_THE_SERVER

mkdir -p /home/user_name/.ssh && touch /home/user_name/.ssh/authorized_keys

and paste the public key to authorized_keys file.

Don’t forget to: chmod 700 /home/user_name/.ssh && chmod 600 /home/user_name/.ssh/authorized_keys chown -R username:username /home/username/.ssh

kitty missing or unsuitable terminal error

kitty +kitten ssh myserver

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Load a small linux distro inside the /boot

“Tiny Core’s small enough that I’ll often throw the entirety of it in /boot or /boot/EFI on my Linux desktops as a recovery environment.

root (hd0,1)
    kernel /tinycore/vmlinuz tce=sda1/tinycore/tce vga=794
    initrd /tinycore/core.gz

in GRUB’s shell should do the trick no matter what might lurk in grub.cfg.”

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