MAC OS has many usefull shortcut commands and some of them are listed here:
Here are the modifier key symbols you can see in Mac OS X menus:
Start up hot-keys (press key while booting)
X = Force Mac OS X startup
C = Start up from a bootable CD
N = Attempt to start up from a compatible network server (NetBoot)
T = Start up in FireWire Target Disk mode
Opt-Cmd-Shift-Delete = Seeks a different startup volume
Shift = Start up in Safe Boot mode
Cmd-V = Start up in Verbose mode
Cmd-S = Start up in Single-User mode
Cmd-Opt-Esc = Force Quit menu
Cmd-Opt-D = Show/hide the dock
Ctrl-Eject = Bring up Shutdown/Sleep/Logout Dialog
Ctrl-Cmd-Eject = Restart immediately
Clipboard
Cmd-C = Copy
Cmd-V = Paste
Cmd-X = Cut
Cmd-A = Select All
Finder Navigation
Cmd-N = New Finder window
Cmd-W = Close Window
Opt-Cmd-W = Close all Windows
Cmd-Down = Open File/Folder
Cmd-Up = Navigate to parent
Cmd-Right = Expand folder (in list view)
Cmd-Left = Collapse Folder (in list view)
Opt-Cmd-Right = Expand folder and its subfolders (in list view)
Opt-Cmd-Up = Open parent folder and close current window
Cmd-Shift-H = Jump to your Home folder
Cmd-Shift-A = Jump to your Applications folder
Cmd-Shift U = Jump to your Utilities folder
Cmd-Shift K = Jump to the Network browser
Cmd-Shift G = Goto Folder…
Cmd-1 = View as Icons
Cmd-2 = View as List
Cmd-3 = View as Columns
Cmd-Space = Open Spotlight (OS X 10.4)
Cmd-Delete = Move file/folder to trash
Cmd-Click window title = Display the file path
Above are only some of the may Mac OS X keyboard shortcuts you can do if you want to see a full list visit: http://support.apple.com/kb/ht1343
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