Logwatch is a useful command to summarize log files. It can be configured to use settings from it's config file and run by cron, but it can also be useful to run ad-hoc from the command line.
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+# logwatch
+
+> Summarizes many different logs for common services (e.g., apache, pam_unix, sshd, etc.) in a single report.
+- Analyze logs for a range of dates at certain level of detail:
+`logwatch --range {{yesterday|today|all|help}} --detail {{low|medium|others}}'`
+- Restrict report to only include information for a selected service:
+`logwatch --range {{all}} --service {{apache|pam_unix|etc}}`
kalebo