Natürlich nicht... 
Code:
/var/tmp/flash # digitemp -s /dev/ttyUSB0 -i
DigiTemp v3.5.0 Copyright 1996-2007 by Brian C. Lane
GNU Public License v2.0 - http://www.digitemp.com
Turning off all DS2409 Couplers
Searching the 1-Wire LAN
/var/tmp/flash #
/var/tmp/flash #
/var/tmp/flash # digitemp -a
DigiTemp v3.5.0 Copyright 1996-2007 by Brian C. Lane
GNU Public License v2.0 - http://www.digitemp.com
Error, serial port '' does not exists!