Adobe Photoshop CS4 Keys for selecting and moving objects keyboard shortcuts keys

Shortcut                                                           Command
	This is not a complete list of keyboard shortcuts. This table lists only those shortcuts that are not displayed in menu cmnds or tool tips.
Any marquee tool (except single column and single row) + spacebar-drag	Reposition marquee while selecting**
Any selection tool + Shft-drag	Add to a selection
Any selection tool + Optn-drag	Subtract from a selection
Any selection tool (except Quick Selection tool) + Shft-Optn-drag	Intersect a selection
Shft-drag	Constrain marquee to square or circle (if no other selections are active)**
Optn-drag	Draw marquee from center (if no other selections are active)**
Shft + Optn-drag	Constrain shape and draw marquee from center**
Cmnd (except when Hand, Slice, Path, Shape, or any Pen tool is selected)	Switch to Move tool
Optn-drag	Switch from Magnetic Lasso tool to Lasso tool
Optn-click	Switch from Magnetic Lasso tool to polygonal Lasso tool
Return/Esc or Cmnd + . (period)	Apply/cancel an operation of the Magnetic Lasso
Move tool + Optn-drag selection**	Move copy of selection
Move tool + Right Arrow, Left Arrow, Up Arrow, or Down Arrow**	Move selection area 1 pixel
Move tool + Right Arrow, Left Arrow, Up Arrow, or Down Arrow* **	Move selection 1 pixel
Cmnd + Right Arrow, Left Arrow, Up Arrow, or Down Arrow*	Move layer 1 pixel when nothing selected on layer
Magnetic Lasso tool + [ or ]	Increase/decrease detection width
Crop tool + Return or Esc	Accept cropping or exit cropping
/ (forward slash)	Toggle crop shield off and on
Ruler tool + Optn-drag end point	Make protractor
Shft-drag guide	Snap guide to ruler ticks (except when View > Snap is unchecked)
Optn-drag guide	Convert between horizontal and vertical guide
	*Hold down Shift to move 10 pixels
	**Applies to shape tools