Cleaning up the users and locking down the shells in /etc/passwd

[Matt Alexander]

Hi!

Would it be possible to remove the vast majority of users from /etc/passwd
and instead rely on the application being installed to create the specific
user if needed?  Most of the users appear to be historical remnants that
have been carried over from release to release.

In addition, for users in the passwd file that must be there, could you
please set their shell to /usr/sbin/nologin?

Thanks for considering this!
~Matt
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