Logout GNOME from command line

$: gnome-session-quit

Reference(s):
http://askubuntu.com/questions/15795/how-can-you-log-out-via-the-terminal

Delete files in a directory that is older than specified

Delete all files in C:\temp which was older than 04/14/2013.

c:\temp> forfiles /D -04/13/2013 -c "cmd /c rmdir /s /q @file"