For the normal 90 deg rotation needed for landscape Intergraph pages:
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gs   -sDEVICE=pdfwrite   -sOutputFile="output_file.pdf"   -dNOPAUSE   -dEPSCrop      -c "<</Orientation 3>>  setpagedevice"   -f "input_file.ps"   -c quit


Remove the   -dEPSCrop   if you want the full ps page size
to appear in the pdf output file.





Specific Examples of files from Intergraph:
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gs  -sDEVICE=pdfwrite  -sOutputFile="geophone_box_electronics.pdf"  -dNOPAUSE  -dEPSCrop  -c "<</Orientation 3>>  setpagedevice"  -f "geophone_box_1.ps"  -c quit


gs  -sDEVICE=pdfwrite  -sOutputFile="3_axis_box_electronics.pdf"  -dNOPAUSE  -c "<</Orientation 3>>  setpagedevice"  -f "3_axis_box_electronics.ps"  -c quit



Specific Examples of file from Top Drawer:
------------------------------------------

gs  -sDEVICE=pdfwrite  -sOutputFile="filtered_nn1.pdf"  -dNOPAUSE  -c "<</Orientation 1>>  setpagedevice"  -f "filtered.ps"  -c quit