NSS module providing passwd, shadow, group, services and protocols database.
 This module scans directories /etc/nss.d/passwd.d, /etc/nss.d/shadow.d, /etc/nss.d/group.d, /etc/nss.d/services.d 
 and /etc/nss.d/protocols.d for files containing passwd, shadow, group, service and protocol entries respectively.