How can the administrator remove all entries from the error log?

The errclear command directly manipulates the AIX error log database located at /var/adm/ras/errlog. When called with the argument 0, it removes all entries regardless of age or sequence number, effectively wiping the entire error log. This is the correct and documented method for a complete error log cleanup.

errpt is the error report command used to display and format error log entries; it does not support a -c flag for clearing the log.

errlogger is used to write administrator-defined informational entries into the error log; it has no capability to clear or remove log entries.

errdemon is the background daemon that manages error logging; it does not accept a -c flag and cannot be used to clear log entries.