Generate a list of fractions and their decimal equivalents. Defaults to 1/64 increments.

inches.sh

#!/bin/bash

scale=3

if [ $# -lt 1 ]; then
  fract=64
else
  fract=$1
fi

for i in `seq 1 $[fract-1]`; do

  temp=$i
  div=$fract

  while [ $[temp%2] -eq 0 ]; do
    temp=$[temp/2]
    div=$[div/2]
  done

  echo -en "${temp}/${div}\t"
  echo -e "scale=${scale}\n${i}/${fract}" | bc

done

I was doing some work in CAD in "freedom units" and found this useful. It generates a list that looks like this:
1/64 .015
1/32 .031
3/64 .046
1/16 .062
5/64 .078
3/32 .093
7/64 .109
1/8 .125
...
61/64 .953
31/32 .968
63/64 .984

If you give it a parameter it will use that divisor instead of 64. The scale is set to 3 decimals at the top of the script.