Check if Linux user exists then test ssh login

usercheck.sh

#!/bin/sh

while read u; do
  echo "checking for username: "$u
  getent passwd $u > /dev/null
  if [ $? -eq 0 ]; then
    id $u
    status=$(ssh -o BatchMode=yes -o ConnectTimeout=5 $u@127.0.0.1 -p 22 echo ok 2>&1)
    echo $status
  fi
done <usernames.txt