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snoopy
Snoopy Command Logger is a small library that logs all program executions on your Linux/BSD system.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If you're looking for a command auditing solution, it looks like some people have rigged up /etc/profile to send every command to syslog directly, some people use software like snoopy, etc. - those are all bypassable by a user, though. Using the kernel's audit functionality to snoop execve (setup auditd, set up rules like "auditctl -a exit,always -S execve") has plenty of downsides, but would be a real auditing solution.
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