Generate fish completions using command's --help
# fisher
fisher slavaGanzin/fish-gencomplete
# fundle:
sed -i "1ifundle plugin 'slavaGanzin/fish-gencomplete'" -i ~/.config/fish/config.fish
gencomplete systemctl
gencomplete ss
gencomplete jupyter --help
gencomplete yourBinary --your-show-help-argument
#Debian/Ubuntu
sudo apt-get install help2man
#Arch
sudo pacman -S help2man