System Activity Report: a Unix/Linux command to display various system loads (Wikipedia).

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CRON opens and closes sessions continuously

I'm seeing a huge amount of these lines in my auth logs: Dec 31 03:45:01 xxxxxxx CRON[17259]: pam_unix(cron:session): session opened for user root by (uid=0) Dec 31 03:45:01 xxxxxxx CRON[17259]: ...