$ rpm -q apt
apt-0.5.15lorg2-alt75.x86_64


$ apt-cache search postgres | wc -l
372
$ apt-cache search postgres --names-only | wc -l
219
$ apt-cache search postgres | awk '{print $1}' | grep -i postgres | wc -l
177
$ aptitude  search '!~v~npostgres' | wc -l
177