ghostscript to deal with 3 hole punch margins

duplex.sh

#!/bin/sh
gs \
  -o output_duplex_ch6.pdf \
  -dFirstPage=643 \
  -dLastPage=726 \
  -sDEVICE=pdfwrite \
  -dBATCH \
  -dNOPAUSE \
  -dDEVICEWIDTHPOINTS=612 \
  -dDEVICEHEIGHTPOINTS=792 \
  -dFIXEDMEDIA \
  -c "<< 
      /CurrPageNum 1 def 
      /BeginPage { 
        /CurrPageNum CurrPageNum 1 add def
        CurrPageNum 2 mod 1 eq {
          0.88235 0.88235 scale
          72 36 translate
        } 
        {
          0.88235 0.88235 scale
          0 36 translate  
        } ifelse 
      } bind >> setpagedevice" \
  -f input.pdf

single_side.sh

#!/bin/sh
gs \
  -o output_single.pdf \
  -sDEVICE=pdfwrite \
  -dFIXEDMEDIA \
  -dDEVICEWIDTHPOINTS=612 \
  -dDEVICEHEIGHTPOINTS=792 \
  -c "<< /BeginPage{
         0.88235 0.88235 scale
         72 36 translate
       } >> setpagedevice" \
  -f input.pdf