there is a “find” command on several places of command interface on MIkrotik, but how it works? If I write command like "interface find ‘name-of-ppp-interface’, or any other find in queues, dynamic routes or ppp active sessions, it does not works, there is no output…
example to find
/interface wireless set [find] disabled
to disable all wireless interfaces… 
this is only find i know of.
Find means ‘find’,
e.g. ‘ip route> set [find comment=ni] disabled=yes’, will disable all static routing entries with comment=ni.
As well find will be useful in scripting, information about find and scripting in RouterOS,
http://www.mikrotik.com/docs/ros/2.9/system/scripting