/tool/user-manager/user/find subscriber="admin" ----> return users
/tool/user-manager/user/find subscriber="admin" name="username" --> return any user
/tool/user-manager/user/print --> return subscriber="admin" name="username" ....

How to use /tool/user-manager/user/find command or another way that find user?

From command syntax I assume that you are using API.
Find command is not available fro api, you have to use queries:
http://wiki.mikrotik.com/wiki/API#Queries

Yes I am using Php API. I am gonna try queries.
Thank you very much.

I don't know the exact syntax, but it should be close to this: False=do not send end-of-command zero byte
True=send end-of-command

I Solved my problem with this query;

write("/tool/user-manager/user/print
?=username=$username
");

Hi

i have a problem too

i use the following code and its show !done
but not show any user

mk.Send("/tool/user-manager/user/print")
mk.Send("?=username=" + "username")
mk.Send(".tag=", True)