$ mysql_config_editor set --user=<user> --password --host=<host>
Enter password:

$ ls -la .mylogin.cnf
-rw-------. 1 urmt urmt  136 Dec 19 11:01 .mylogin.cnf
$ mysql_config_editor print --all
[client]
user = <user>
password = *****
host = <host>

$ mysql <dbname>
ERROR 1045 (28000): Access denied for user '<user>'@'<host>' (using password: NO)

$ mysql -p <dbname>
Enter password:
Reading table information...
...
mysql>

$ export MYSQL_TEST_LOGIN_FILE=$HOME/mylogin.cnf

$ mysql_config_editor set --login-path=mytest --host=127.0.0.1 --port=5622 --user=mytest --password
Enter password:

$ ls -l $MYSQL_TEST_LOGIN_FILE
-rw------- 1 mysql mysql 288 Feb 27 14:25 mylogin.cnf

$ mysql --no-defaults --login-path=mytest test