posixAccount Online resources: https://wiki.debian.org/LDAP/PAM https://wiki.debian.org/LDAP/NSS https://arthurdejong.org/nss-pam-ldapd/ https://www.tldp.org/HOWTO/archived/LDAP-Implementation-HOWTO/pamnss.html Security https://www.debian.org/doc/manuals/debian-reference/ch04.it.html https://www.cyberciti.biz/faq/understanding-etcshadow-file/ https://www.tldp.org/LDP/lame/LAME/linux-admin-made-easy/shadow-file-formats.html