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For the following command:

ps x

What does x achieve? The documentation specifies 'select processes without controlling ttys' but I don't understand what this means.

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up vote 2 down vote accepted

Some applications, such as interactive shells and TUI vim, run on terminals or terminal emulators. They "have a controlling tty". Other applications, such as daemons and graphical applications, do not.

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so when I issue a ps x it's supposed to show all my process(?). Can you expand a little further please? –  Sheldon Apr 10 '12 at 4:01
    
How much further can I expand than "doesn't hide processes that don't have a controlling terminal"? –  Ignacio Vazquez-Abrams Apr 10 '12 at 4:02
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