# `EDITOR`
 for EDITOR in 'vim' 'nvim' 'vi' 'nano'
 do
   ! [ "$(command -v "$EDITOR")" ] || break
 done
 export EDITOR
 
 # `TERMINAL`
 for TERMINAL in 'xfce4-terminal' 'gnome-terminal' 'x-terminal-emulator'
 do
   ! [ "$(command -v "$TERMINAL")" ] || break
 done
 export TERMINAL
 
 # `BROWSER`
 for BROWSER in 'firefox' 'chromium-browser' 'x-www-browser'
 do
   ! [ "$(command -v "$BROWSER")" ] || break
 done
 export BROWSER