enable print fname
This command opens the output file  fname that will contain the  instructions  in GrADS metacode format to create a hardcopy of the graphical display. Any existing contents of fname  will be lost.
The output file   fname is referred to as a GrADS metafile. 
Creating a GrADS metafile for vector-graphic hardcopy involves four steps:
1. Open the metafile with the enable print  command
2. Create the graphical display that you want to print
3. Issue the print  command. For multiple images in your metafile, use clear and then print  again.
4. Close the metafile with the disable print  command
After you have created a GrADS metafile, you can
1. convert it to postscript using the external utility gxps 
  2. 
convert it to encapsulated postscript using gxeps or you can 
3. 
display it using the external utilities gxtran or gv32.exe (for MS Windows)