Layer adjuster

Command (except when either the screen navigation or Shape tools are selected)

Ctrl (except when either the screen navigation or Shape tools are selected)

Selection adjuster

Command (when Selection tools are selected)

Ctrl (when Selection tools are selected)

Shape selection tool

Command (when Shape tools are selected)

Ctrl (when Shape tools are selected)

Duplicate

Option + drag

Alt + drag

Delete layer

Command + Shift + D

Ctrl + Shift + D

Move layer by one screen pixel

Hide/Display marquee

Command + Shift + H

Ctrl + Shift + H

Attribute dialog box for current layer

Adjust opacity in 10% increments

1 to 0 keys

1 to 0 keys

Select all layers

Command + Shift + Option + A

none

Deselect layers

Command + Shift + Option + D

none

Select/Deselect mode

Command + Shift

Ctrl + Shift

Reposition

Click inside active selection, and drag

Click inside active selection, and drag

Duplicate

Option + drag

Alt + drag

Move selection by one screen pixel

Arrow keys, on canvas

Arrow keys, on canvas

Delete current selection

Select/Deselect mode

Distort

Option + corner handles

Alt + corner handles

Perspective distort

Command + Option + corner handles

Ctrl + Alt + corner handles

Resize

Corner handles

Corner handles

Resize/Preserve aspect

Shift + corner handles

Shift + corner handles

Resize/One dimension

Side handles

Side handles

Rotate

Command + corner handles

Ctrl + corner handles

Skew

Command + side handles

Ctrl + side handles