I'm currently using:


# convert to g3
g3files=()
a=1
for(i in $infiles){
	switch(`{file <$infiles(1)}){
	case *:*g3* *:*fax*
		g3files=($g3files $i)
	case *:*postscript
		gs -dSAFER '-sDEVICE=dfaxlow' '-sOUTPUTFILE='$tmp'.'$#a'.%03d' -dNOPAUSE -dQUIET $i quit.ps
		g3files=($g3files $tmp.$#a.*)
	case *
		lp -dstdout $i > $tmpps
		gs -dSAFER '-sDEVICE=dfaxlow' '-sOUTPUTFILE='$tmp'.'$#a'.%03d' -dNOPAUSE -dQUIET $tmpps quit.ps
		g3files=($g3files $tmp.$#a.*)
	}
	a=($a $a)
}