On Mon, May 19, 2008 at 05:33:01AM -0700, Emmanuel De Paepe wrote:
> I was just wondering, is there a way you can lock a desktop from command 
> line, like init, shutdown, reboot etc... are used?

If you're using the default xscreensaver, then xscreensaver-command(1)
is your friend:

   % xscreensaver-command -activate

may do what you want.

The man page has the details.

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