This task checks the consistency and integrity of user accounts and groups as defined in the passwd and group files. It checks the local, and NIS or NIS+ password files. NIS+ password file problems are reported but not corrected. This task checks for the following violations:
Duplicate names or IDs
Entries in incorrect format
Accounts without a password
Invalid login directories
The nobody account
Null group password
A plus sign (+) in the /etc/passwd file on an NIS (or NIS+) server