The following list shows the “important” administration files that will be brought under the control of NIS so we know which ones we need to be concerned with:
To do this, they are imported into NIS and stored as a series of database files under the NIS data directory, /var/yp. These database files are known as the “NIS maps” and are based on a simple database format known as “dbm,” which stores and indexes its data in files using the following naming convention:
<filename>.pag (this contains the data)
<filename>.dir (this is an index to the .pag file) ...