Useful GNU/Linux commands and tips.

.gitconfig

[alias]
    st = status
    co = checkout
    ci = commit

    # Undo commit. This resets HEAD, so the currently checked out commit to its parent. It should only be used when you
    # have accidentally committed something and want it to be "uncommited" again. So it takes all changes of the latest
    # commit back to "local" changes.
    uci = reset HEAD~

    # Display git branch graph.
    adog = log --all --decorate --oneline --graph

    # Remove all local branches not present on remote.
    cleanup = ! git remote prune origin && git branch -r | awk '{print $1}' | egrep -v -f /dev/fd/0 <(git branch -vv | grep origin) | awk '{print $1}' | xargs git branch -d

    # Show the diff of the code right after a pull.
    dull = git diff HEAD@{1} HEAD@{0}

go.sh

#!/bin/sh

# NOTE To run the command, these two are valid options:
# a) Run it with a dot in front, e.g. ". go.sh /tmp".
# b) Create an alias in "~/.bashrc", e.g. "alias go='. go.sh'", and run the alias, e.g. "go /tmp".

if [ -n "$1" ]; then
    cd $1
    ls
fi

stuff.sh

# Analyze startup times
systemd-analyze
systemd-analyze blame
systemd-analyze critical-chain

# Reduce wrong password delay to 0.5 s (not working on elementary OS?)
sudo vim /etc/pam.d/login
auth       optional   pam_faildelay.so  delay=500000

# Sane sudo options
sudo visudo
Defaults	env_reset,timestamp_timeout=30,pwfeedback # Re-ask for password every 30 min and enable password feedback.
Defaults	!tty_tickets # Allow session to be valid for all terminals.
`whoami` ALL=(ALL) NOPASSWD:ALL # Give yourself some trust (place after all other priviledge specifications).

# Enable multitouch
# https://github.com/bulletmark/libinput-gestures

# Disable touchscreen (on Surface Pro)
xinput disable "pointer:NTRG0001:01 1B96:1B05"

# Disable Wi-Fi powersave in Ubuntu
sudo vim /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf

[connection]
wifi.powersave = 2

# Enable fractional scaling in Ubuntu
# For X:
gsettings set org.gnome.mutter experimental-features "['x11-randr-fractional-scaling']"
# For Wayland:
gsettings set org.gnome.mutter experimental-features "['scale-monitor-framebuffer']"

# Generate SSH keys
ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_ed25519