Looking for exactly avrdude command line used by arduino IDE

I want to verify and possibly modify the command line arguments that Arduino uses to run Avrdude. Can someone show me where to find that?

File:Preferences, check the Verbose Output boxes.
Then watch the messages that go by when you Verify and/or Upload a sketch.

Exactly what I needed, thank you.

in V2 look at hardware/arduino/avr/platform.txt to modify the command
Best regards
Jantje

V2? How relate to 1.0.5 or 1.5.5?

My bad Arduino IDE 1.5.X
V2 is the version of my plugin supporting Arduino IDE 1.5.X
The upload command is

tools.avrdude.upload.pattern

Jantje