George,
The script below (which I name gschem-print) prints schematic files from the command line. Replace the string GEDA_SCHEME_DIR with the name of your gEDA scheme directory.
#!/bin/bash for name in $* do base="${name%.*}" gschem -o$base.ps -sGEDA_SCHEME_DIR/gschem-print.scm $base.sch lpr -P$PRINTER $base.ps done
-Dan