Match user+hash file with pass+hash file

match.sh

#!/bin/bash

grep . users.txt | while read user; do
  echo "$(echo $user | grep -o '^\S*' | grep -v '^$') $(cat pass.txt | grep "$(echo $user | grep -o '\s\S*' | grep -o '\S.*')" | grep -o '^\S*' | grep -v '^$' || echo -e "\033[2K\033[1A")"
done

pass.txt

password1 a1a1a1a1
password4 d2d2d2d2
password2 b1b1b1b1
password3 c1c1c1c1
password5 a1b1c1d2

users.txt

timwatkins a1a1a1a1
taherazab b1b1b1b1
greg d1d1d1d1
mattdamon c1c1c1c1