why I can't get the mysql data?

[vnline]

version: zabbix 1.9.7RC
I have add UserParameter like that:

UserParameter=mysql.ping,mysqladmin -uroot -p`cat /save/mysql_root` ping | grep -c alive
UserParameter=mysql.uptime,mysqladmin -uroot -p`cat /save/mysql_root` status | awk '{print $2}'
UserParameter=mysql.threads,mysqladmin -uroot -p`cat /save/mysql_root` status | awk '{print $4}'
UserParameter=version.mysql,mysqladmin -uroot -p`cat /save/mysql_root` version | awk 'NR==6{print $3}'
UserParameter=mysql.qps,mysqladmin -uroot -p`cat /save/mysql_root` status | cut -f9 -d ":"
UserParameter=mysql.slowqueries,mysqladmin -uroot -p`cat /save/mysql_root` status | cut -f5 -d ":"|cut -f1 -d "O"

zabbix_get can't get anything, but the zabbix_agentd -t key can get the collection data