[Proj] cs2cs usage

[marco.pasetti at alice.it]

Hi all,
 
I read cs2cs manual page, but I still have big doubts about it! quickly:
 
0. Preamble: I built PROJ.4 4.6 on windows using MinGW
 
1. Question 1: when I launch cs2cs from command line it executes the requested operation and then waits for others inputs... how can I quit, without the need of killing the process in task manager?
 
2. Question 2: I need to trasform single points from WGS84 (EPSG ID = 4326) to Gauss-Boaga Roma40 West (EPSG ID = 3003)
while ID=4326 determinates an univocal datum, to correctly define Gauss-Boaga Roma40 West I need to specify also +towgs84 parameters, retrieved by GRASS (creating a new location in GRASS using 3003 EPSG code, it asks for furthers options, suggesting the correct parameters to set):
the complete datum definition for Gauss-Boaga Roma40 West is as follows (from GRASS):
 
EPSG ID = 3003
Option 2
Used in Italy (Peninsular Part)
towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68
Accuracy 3-4m
 
how can I use cs2cs respecting the previous parameters?
I tried with cs2cs +init=epsg:4326 +to +init=epsg:3003
but I don't know how to set towgs84 parameters (and even if they are needed)
 
Thanks fo help
 
Marco
 
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