This directory contains files related to the Cory hashed password file code.
The password file isn't really hashed, it's done with binary search, but
if you have a big password file it will still make a big difference.

The interface is through the getpwnam and getpwuid subroutines, so it's
completely compatible with standard v7 at the source program level.

To update the password file (e.g. to add an account) you should run
/etc/vipw which locks the file and remakes the tables.  The source
to vipw is expw.c, there should be links to /etc/expw and /etc/vipw.