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I just had a question regarding the attached part of my /var/log/auth.log file. (Raspberry Pi 2B, running Raspbian Jessy, fully updated / upgraded)

First of all I got rid of the root user all together, but i seem to see a bunch of log-ins for that user (displaying root and/or uid=0), which seem to be locally, as there is no IP-address.

The second question is, why is there an entry for a session of user smmsp every couple minutes.

auth.log

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    That's cron logs. Check your crontab. – Mat Sep 20 '16 at 14:32
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    It is generally preferred to display (possibly redacted) output as code block instead of using screen shots. – countermode Sep 20 '16 at 14:43
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The first two and the last one are CRONs, which is needed for some automated tasks (depend on what is running on your machine sudo crontab -e?

The third is probably you running the tail -f /var/log/auth.log through sudo.

There is nothing to be concerned about. You can't get rid of root user, otherwise you would not be able to do any administrative tasks.

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