jl@db01:~$ mysql --defaults-file=/home/jl/.my.cnf -N -B -e "USE customer_management; SELECT CAST(AES_DECRYPT(password, '1234Test') AS CHAR) AS decrypted_password FROM customer_access WHERE customer_name = 'Kunde30';" | tr -d '\n'
UdBz9XquT0gAwLrLQaCl4w==jl@db01:~$

**no new lines in the output**