This task checks the consistency and integrity of user accounts and groups as they are defined in the passwd and group files. This task 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