You might like the little script I use to automatically go from an input file to a rendered file. Here it is (BTW, as you will see below, Povscript will be called "molscript" after compiling. I rename it povscript.)

     #!/bin/bash   
     #Use dorend [molscript file] [width height] [output name]
     # example dorend coils.ms 600 800 coils-zoomed.png
     #
     if [ $1 ]; then input=$1
      else echo "Please pick a Molscript input file.  These \".ms\" and \".povs\" files are available:"
      echo ; ls *.ms *.povs; echo ; echo -n "Which one?  " ;read input
     fi
     root=`echo $input | awk -F . '{print ($1)}'`
     ext=`echo $input | awk -F . 'NF > 1 {print ($NF)}
                                 NF==1 {print ("ms")}'`
     if [ $3 ]; then s2=$3; s1=$2
       else s1=600; s2=600
     fi
     if [ $4 ]; then outfile=$4
      else outfile=$root.png
     fi
     
     #This next line refers to Povscript+, which is called Molscript
     molscript -r -size $s1 $s2   < $root.$ext > $root.rd 
     render  < $root.rd >$outfile
     rm -f $root.rd
     display  $outfile &