[root@localhost ~]# mariadb-secure-installation --defaults-group-suffix=.lz

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB

      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

...

Enter current password for root (enter for none): 

/usr/bin/mariadb: unknown variable 'defaults-group-suffix=.lz'

OK, successfully used password, moving on...

[root@localhost ~]# head -50 /usr/bin/mariadb-secure-installation

#!/bin/sh

...

config=".my.cnf.$$"

command=".mysql.$$"

output=".my.output.$$"

trap "interrupt" 1 2 3 6 15

rootpass=""

echo_n=

echo_c=

basedir=

defaults_file=

defaults_extra_file=

no_defaults=