Script that prompts to mark AppImage executable, and subsequently launch it

make-appimage-executable.sh

#!/bin/bash
# Put this script somewhere, and mark it as the default program to open AppImage files.
# Now if you click an AppImage that's not marked as executable,
# it will prompt whether you want to make it so, and launch it.
zenity --question \
  --title 'AppImage is not executable' \
  --text 'This AppImage is not marked as executable. Do you want to mark it as executable and launch the program?' \
  --width=512
if [[ $? = 0 ]]
then
  chmod u+x $1
  "$@"
fi

Note: This is a user-convenience script. It won't cover all scenarios:

• Won't work if you don't have zenity installed
• Won't work if the AppImage is not owned by the current user
• You must mark this script as executable and set it to be the default program to open AppImages.