for example, this terminal command: ping www.google.com so my question is how can I create a launcher in my desktop can do this command, so there is no longer needs to open terminal every time and write this it.
Well you could create a new document on your Desktop, name it something.desktop like ping1.desktop
Then put this in, Name= & Icon= lines can be whatever you want (usually best to full path Icon=) or you can leave Icon= blank
[Desktop Entry]
Version=1.0
Type=Application
Terminal=true
Exec=ping www.google.com
Name=whatever you want
Icon=
After creating right click on the launcher > Properties > Permissions > & check the Execute: box
(- you could also extend it's use to other pings if you use in unity's launcher via added quicklist entries in the .desktop
