You can do this in bash for example, that might be the easiest to start with. The quickest way would be to copy the logs via `scp` on your machine and to parse them there.
A different approach would be to create a central syslog server and have all your machines put their logs on that server. Of course your server would need to be up all the time.
A third approach would be to use something like logwatch on the different machines and have them generate an alert in a central place.
Pick yours, depending on the amount you can wait to get the alert and the possibility of having a central log server.
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