When I hit the upload icon while holding shift this is what I see in the text box at the bottom. Binary sketch size: 1018 bytes (of a 32256 byte maximum)
/Volumes/Arduino 1/Arduino.app/Contents/Resources/Java/hardware/tools/avr/bin/avrdude -C/Volumes/Arduino 1/Arduino.app/Contents/Resources/Java/hardware/tools/avr/etc/avrdude.conf -v -v -v -v -patmega328p -cstk500v1 -P/dev/cu.usbmodem0000103D1 -b115200 -D -Uflash:w:/tmp/build2547085465394088275.tmp/Blink.cpp.hex:i
avrdude: Version 5.4-arduino, compiled on Oct 9 2007 at 11:20:31
Copyright (c) 2000-2005 Brian Dean,
http://www.bdmicro.com/ System wide configuration file is "/Volumes/Arduino 1/Arduino.app/Contents/Resources/Java/hardware/tools/avr/etc/avrdude.conf"
User configuration file is "/Users/justintillson/.avrduderc"
User configuration file does not exist or is not a regular file, skipping
Using Port : /dev/cu.usbmodem0000103D1
Using Programmer : stk500v1
Overriding Baud Rate : 115200
avrdude: Send: 0 [30] [20]
avrdude: Send: 0 [30] [20]
avrdude: Send: 0 [30] [20]
avrdude: Recv: . [86]
avrdude: stk500_getsync(): not in sync: resp=0x86
avrdude: Send: Q [51] [20]
avrdude: ser_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding
I The tx and Rx lights flicker for just a few seconds and the pre installed plink program runs again.