pkg_search scans the ports INDEX file to use as a database, fetching it
if necessary.  Example of usage to search for a package:

 # pkg_search cyrus-sasl
 cyrus-sasl-1.5.28_5   RFC 2222 SASL (Simple Authentication and Security Layer)
 cyrus-sasl-2.1.22     RFC 2222 SASL (Simple Authentication and Security Layer)
 cyrus-sasl-ldapdb-2.1.22      SASL LDAPDB auxprop plugin
 cyrus-sasl-saslauthd-2.1.22   SASL authentication server for cyrus-sasl2

 # pkg_search -i cyrus-sasl-2.1.22
 Name : cyrus-sasl-2.1.22-50
 Dir  : /usr/ports/security/cyrus-sasl2
 Desc : RFC 2222 SASL (Simple Authentication and Security Layer)
 URL  : http://cyrusimap.web.cmu.edu/
 Deps :