Garbage collection of installed packages

[Geert Hendrickx]

I use this script to find packages which are NOT dependencies of other
packages: 

#/bin/sh
cd /var/db/pkg
for i in * ; do [ -e ${i}/+REQUIRED_BY ] || echo ${i} ; done

This way you also see the packages which you installed expicitly (most
of them are not depended on by other packages either), but I suppose
you know/recognize those.  

GH