When installing a new system, depending on selected packages, some uids for some packages aren't always the same.
eg: 'sshd' may be UID 102, sometimes another value. On the other hand, 'www-data' is always '33'
How can I figure out all packages with reserved UIDs (ie www-data) and all the packages that generate a pseudo-random administration UID (<1000, ie: sshd)? This goes for GIDs too.
Is there a list of all those packages? Or is there an aptitude command that let's me find out all those packages, even the ones not installed?