Controls (varies on the version of the game)

 

http://eo.wikipedia.org/wiki/Dosiero:Game_controller_PlayStation_2.jpg

Running - Square or Circle
Aiming - R1
Firing - R1 + X
Reloading - R1 + Square or R1 + Circle
Knife - L1
Knife attack - L1 + X
Interact - X
Controlling Ashley - R2
Pull up map - Triangle
Inventory - Start button
Options menu - Select button
Skip a cut scene - Select button