Change password in config on the fly

$password = 'P@ssw0rd@123'   # Command line input
# Update password in config file

sed -i 's/requirepass.*/requirepass $password/' /etc/redis.conf

# Start redis server
redis-server /etc/redis.conf

# Remove password in config file
sed -i 's/requirepass.*/requirepass PASSWORD_REMOVED/' /etc/redis.conf