Opening other files on Linux
You need to have a graphical window utility installed.
Linux does not offer a default “open” command
• Some window managers have a utility for this
• Gnome: gnome-open
• Kde: kde-open
• Xfce: exo-open
Call the correct program directly
• “firefoxindex.html”
• “opera index.html”
• You have to know what is installed on your system