Here is an example of how to search your Event Logs using PowerShell.
get-eventlog "Security" | where {$_.Message -like "*search term*"} | export-csv c:\temp\test.csv
This would be useful in the following situations:
-Searching the Security event log for computer logins by IP. This is useful if you want to search for the IP of a computer to find the last user who used it.
-Searching the Security event log for file movement operations if you have audit switched on.
Remember you can change the “Security” word to one of the other windows event logs to search a different log.
thecomputerperson 