systemd-first-boot-script/scripts/03-user-password

#!/bin/bash
# Licence : GPL v3
# Author: Laurent HUBERT
#
# Changes the default user's password (id=1000)
#
# Default user should have id 1000:
the_user=$(id -u 1000 -n)
cat <<EOF
+---------------------------------------------+
| Changing $the_user password                 |
+---------------------------------------------+
EOF
status=1
while [ 0 -ne "$status" ]
do
  passwd $the_user
  status=$?
  if [ 0 -ne "$status" ]
  then
    echo "### Error changing $the_user password   ###"
    echo "Please try again"
  else
    echo "> $the_user password : changed  <"
    exit 0
  fi
done

echo "### An error occurred changing $the_user password   ###"
exit $status