Problem with UserParameter

[nick147]

Zabbix server and client 1.1

I create UserParameter:

UserParameter=test,lynx -dump http://localhost/monitoring.php?read_mark|grep OK|wc -l

when server connect to client I get:

sh: line 1: 5412 Done lynx -dump http://localhost/monitoring.php?read_mark
5414 | grep OK
5415 Broken pipe | wc -l

If I use telnet I get:
ZBX_ERROR

what is wrong?
Thnx