How do I change the launcher commands? [duplicate]

Question

This question already has an answer here:

• How do I change the command that a launcher item launches? [duplicate] 2 answers

I'd like to change the behaviour of the launcher, so that if I click on the firefox icon, it runs the command

$ optirun firefox

Does anyone know how to change it?

Thank you

Answer 1

If you change it in the dash, you'll automatically change it in the launcher. So start "main menu" (that's alacarte) from the dash, navigate to Internet and then Firefox. There you can set a new Run-entry (replace firefox %u with optirun firefox %u - whatever optirun is). You could also edit the launcher manually with sudo vim /usr/share/applications/firefox.desktop and change the Exec line.

Answer 2

--First copy the firefox.desktop to home by,

cp /usr/share/applications/firefox.desktop ~/.local/share/applications

if not present then create a new one in the above last location.

--Then open it for editing

gedit ~/.local/share/applications/firefox.desktop

--Third , add the following code.

X-Ayatana-Desktop-Shortcuts=Optirun;NewWindow;
[Optirun Shortcut Group]
Name=Optirun Firefox
Exec=optirun firefox
TargetEnvironment=Unity

[NewWindow Shortcut Group]
Name=Open a New Window
Exec=firefox -new-window about:blank
TargetEnvironment=Unity

Now save the File, browse through ~/.local/share/applications. From there drag the firefox.desktop to the launcher.

Source: https://askubuntu.com/a/42853/63025