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Writing LDAP search filter

LDAP search filter is useful in Apache LDAP authentication and Ironport.

Under Ironport, I use the below filter to search for valid user with his aliase :

(|(uid={u})(cn={u}))

I use the below to search if an user/alias is in a specific posix group :

(&(cn={g})(memberUid={u}))

Under OpenLDAP, to search a user :

ldapsearch -x -b […]

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