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NOTES.md

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Random assembly of notes

NixOS

sudo nixos-rebuild switch --flake ".#$(hostname -s)"

sudo nix-collect-garbage -d
sudo nix-env --delete-generations old --profile /nix/var/nix/profiles/system 
sudo /nix/var/nix/profiles/system/bin/switch-to-configuration switch

Non-NixOS

# Install any version of nix
apt install nix
# Add user to `nix-users` group (and logout/login)
sudo usermod -a -G nix-users $USER
# Add the proper nixpkgs channel
nix-channel --add https://nixos.org/channels/nixos-23.05 nixpkgs
nix-channel --update
nix-instantiate '<nixpkgs>' -A hello # just to test
nix-channel --add https://github.com/nix-community/home-manager/archive/release-23.05.tar.gz home-manager
nix-channel --update
# Let's create the first generation with home-manager
nix-shell '<home-manager>' -A install
# Support for flakes
nix-env -iA nixpkgs.nixUnstable

Add to .profile:

export XDG_DATA_DIRS="$HOME/.nix-profile/share/:$XDG_DATA_DIRS"

Also source home-manager if .bashrc is off limits for nix:

. "/home/nvoss/.nix-profile/etc/profile.d/hm-session-vars.sh"

For alacritty you'll have to create a Desktop item manually as the packet is overriden, checkout its repository for an example and make sure to add required environment variables.

If nix command or flakes are not available:

mkdir -p ~/.config/nix
echo "experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf

Some manual gnome stuff for now:

for i in {1..9}; do 
  gsettings set "org.gnome.shell.keybindings" "switch-to-application-$i" "[]"
  gsettings set "org.gnome.desktop.wm.keybindings" "switch-to-workspace-$i" "['<Super>${i}']"
  gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-${i} "['<Super><Shift>${i}']"
done

Also setup alacritty, e.g. copy command from desktop entry and create custom shortcut through GUI.

Obsolete once gnome settings are moved out of nixos module and part of home manager module.

ZSH

Changing to zsh without chsh (change .bashrc):

if echo $- | grep -q 'i' && [[ -x "$HOME/.nix-profile/bin/zsh" ]]; then
  exec "$HOME/.nix-profile/bin/zsh" -i
fi

You might have to restart it after first run as plugins might install.

Yubikey

To setup the Yubikey for use with git and ssh, we only really need to import and trust it. The Yubikey is expected to be fully setup via drduh's guide.

# find you key id and import
gpg --keyserver keyserver.ubuntu.com --receive-keys 95a482bc50edbaa80df55b6382de9de03b66b361
# list your local keys
gpg -k
# edit and `trust` the key
gpg --edit-key 95A482BC50EDBAA80DF55B6382DE9DE03B66B361
# let's also store the public key for other uses
ssh-add -L | grep "cardno:000613075305" > ~/.ssh/id_rsa.pub

Working with PDFs

Gnome

dconf dump /org/gnome/

Removing password

qpdf --password=<password> --decrypt input.pdf output.pdf

Extract range of pages

pdftk input.pdf cat 2-3 output output.pdf

Compressing PDFs

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf

Summary of -dPDFSETTINGS:

  • -dPDFSETTINGS=/screen lower quality, smaller size. (72 dpi)
  • -dPDFSETTINGS=/ebook for better quality, but slightly larger pdfs. (150 dpi)
  • -dPDFSETTINGS=/prepress output similar to Acrobat Distiller "Prepress Optimized" setting (300 dpi)
  • -dPDFSETTINGS=/printer selects output similar to the Acrobat Distiller "Print Optimized" setting (300 dpi)
  • -dPDFSETTINGS=/default selects output intended to be useful across a wide variety of uses, possibly at the expense of a larger output file

Reference: https://www.ghostscript.com/doc/current/VectorDevices.htm#PSPDF_IN:

Misc

German Umlaute without Xmodmap

https://blog.florianheinle.de/englische-tastatur-umlaute