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Split mkv video

mkvtoolnix: https://mkvtoolnix.download/downloads.html#ubuntu

  1. PGP key
sudo wget -O /usr/share/keyrings/gpg-pub-moritzbunkus.gpg https://mkvtoolnix.download/gpg-pub-moritzbunkus.gpg
  1. Add apt repo
❯ cat /etc/apt/sources.list.d/mkvtoolnix.list
deb [arch=amd64 signed-by=/usr/share/keyrings/gpg-pub-moritzbunkus.gpg] https://mkvtoolnix.download/ubuntu/ impish main
  1. Install
sudo apt update
sudo apt install mkvtoolnix mkvtoolnix-gui
  1. Use
mkvmerge --split parts:00:02:13-00:03:00 input.mkv -o output.mkv

Analyze disk usage

ncdu -1xo- / | gzip > /tmp/ncdu_export.gz
# ...some time later:
zcat /tmp/ncdu_export.gz | ncdu -f-

Convert a text file to an image

convert -size 1920x1080 xc:black -font /home/mohammedi/.fonts/SourceCodePro-Medium.otf -pointsize 30 -fill white -annotate +15+20 "@ascii.txt" image.png

Default security policy in /etc/ImageMagick-6/policy.xml prevents writing a text file to image, you have to disable this behavior by commenting this line:

<policy domain="path" rights="none" pattern="@*"/>

Convert an HTML to an image

sudo apt-get install texlive-latex-base texlive-fonts-recommended texlive-fonts-extra texlive-latex-extra

pandoc tasks.html -o tasks.pdf

convert tasks.pdf tasks.png

Set a background (doesn't work for ubuntu/gnome)

sudo apt install feh
feh --bg-scale image.png

gsettings set org.gnome.desktop.background picture-uri "file:////tmp/tasks.png"

I3

Rofi

sudo apt install rofi

polybar

sudo apt install polybar
sudo apt install mpd
sudo apt install bspwm
sudo apt install xbacklight

Natural scrolling

https://askubuntu.com/questions/1122513/how-to-add-natural-inverted-mouse-scrolling-in-i3-window-manager

Add Option "NaturalScrolling" "True" to /usr/share/X11/xorg.conf.d/40-libinput.conf

For mouse look for "pointer catch all", for touchpad look for "touchpad catch all"

Autolock

answer: https://faq.i3wm.org/question/83/how-to-run-i3lock-after-computer-inactivity.1.html

sudo apt install xautolock

cat ~/bin/fuzzy_lock.sh:

#!/bin/sh -e

# Take a screenshot
scrot /tmp/screen_locked.png

# Pixellate it 10x
mogrify -scale 10% -scale 1000% /tmp/screen_locked.png

# Lock screen displaying this image.
i3lock -i /tmp/screen_locked.png

# Turn the screen off after a delay.
# What about if I unlock the screen before this 60 seconds completes ?
# sleep 60; pgrep i3lock && xset dpms force off

KDE on Ubuntu

https://askubuntu.com/questions/135267/whats-the-difference-between-kde-packages

SDDM insted of GDM

sudo apt install sddm
  • Get rid of the virtual keyboard that takes most of the screen when typing password
sudo cat /etc/sddm.conf
[General]
InputMethod=

Keyboard shortcuts

  • The PATH is not yet loaded, so we can't for example assume the scripts in ~/bin are accessible by their names, we have to use the full path, ~ is also acceptable and will be, as expected, replaced by $HOME
  • I couldn't set a keyboard shortcut to a command with parameter like "command arg"
  • If we setup a keyboard shortcut to a bash script that has no #!/bin/bash this error will pop up when we click that shortcut "execvp: Exec format error"

Snapd applications are not present in the menu

Which also makes applications that uses "xdg-open" (maybe alo kio-client) to fail to open their links from the browser like when trying to log in to a Slack workspace

sudo ln -s /var/lib/snapd/desktop/applications/* /usr/share/applications/

Watch Don't starve folder and commit changes

#!/bin/bash
# run inotify command
echo "Start watching for close_write,create,delete and move events with inotify ..."
# we use close_write instead of modify because modify could be emited many times, it depends on how much write() was called
# whereas the close_write is only emited once when the file being edited (opened in write mode) is closed
# see: https://stackoverflow.com/a/32424150/7573221
inotifywait -r -q -m -e close_write -e delete -e move --exclude='.git/*' --format="echo 'Committing: %e on %w%f' && git add . && git commit -m'auto commit: %e on %w%f' && sleep 1 && git push" . | zsh
echo "Stopped watching ..."

[program:auto-push-dont-starve]
environment=USER=mohammedi,HOME=/home/mohammedi
user=mohammedi
autostart=True
directory=/home/mohammedi/.steam/steam/userdata/1072787539/219740
command=zsh -c "sudo -u mohammedi /home/mohammedi/.steam/steam/userdata/1072787539/219740/watch.sh"
stderr_logfile=/var/log/auto-push-dont-starve/error.log
stdout_logfile=/var/log/auto-push-dont-starve/out.log