Ubuntu – what is the command+k ( in mac ) equivalent in ubuntu

espeak should be installed by default as text-to-speech engine on Linux.

You should be able to get it to speak from command-line by doing something like this:

echo "Text to speak"|espeak

You can also start espeak by just entering espeak itself, and then enter each line of text you want spoken followed by enter.

Other TTS engines for Linux you could look at:

• http://www.cstr.ed.ac.uk/projects/festival/
• http://epos.ure.cas.cz/

Espeak is available at (but should be installed by default!):

• http://espeak.sourceforge.net/

Not sure if you have such a command, but I believe you can set up Mac OS X terminal to close when you type exit.

This will close the window but not the terminal app. Please have a look at this question about how to also quite the terminal app when typing exit.