Generating some hashes of truncated macs

Creating some hashes

#!/usr/bin/env bash

hexchars="0123456789ABCDEF"
macs=()
for run in {1..10}
do
  macs+=($( for i in {1..6} ;do echo -n ${hexchars:$(( $RANDOM % 16 )):1} ; done | sed -e 's/\(..\)/-\1/g' ))
done

seeds=("20171101" "20171102" "20171103")

for run in {1..20}
do
  selectedSeed=${seeds[$RANDOM % ${#seeds[@]} ]}
  selectedMac=${macs[$RANDOM % ${#macs[@]} ]}
  
  echo -n "Mac adress: 00-60-2F${selectedMac}"
  echo -n ", Seed: ${selectedSeed}, Hash:"
  echo "${selectedSeed}00-60-2F${selectedMac:0:6}" | shasum -a 256
done