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The pwck command scans the /etc/passwd file, or the named file, and writes to standard output any inconsistencies. The scan checks the number of fields, login name, user ID, group ID, and existence of a login directory and optional program name.
The grpck command scans the /etc/group file, or the named file, and writes to standard output any inconsistencies. The scan checks the number of fields, group name, group ID, and whether all login names appear in the password file. grpck writes to standard output any group entries that do not have login names.
To verify the password information in the /etc/passwd file for consistency, enter: pwck
Commands: adduser(8), groups(1), passwd(1), vipw(8) delim off