Thus spake David Brownlee
> 	Add -dBATCH ?

And -dNOPAUSE.  My final version which works fine is;

    gs -q -dBATCH -dNOPAUSE -sDEVICE=ljet4 -sOutputFile=- -r600x600 -

-- 
D'Arcy J.M. Cain <darcy@{druid|vex}.net>   |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.