I have a log file that was created by nobody:nogroup, which is activity being logged to, I wanted to emulate adding a message to that log file. My first thought was to:

$ sudo su nobody
This account is currently not available.

You have a way simpler solution, just run: su -s /bin/bash nobody (replace /bin/bash with the shell of your choice).

The This account is currently not available. error is due to the fact that nobody user default shell is /usr/sbin/nologin, su -s force the system to use another shell.

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An email thread:

.. points out that sudo -u nobody [cmd ...] can be used:

(Combined with the trick of How to append to a file as sudo)

echo "Hello World" | sudo -u nobody tee -a /tmp/logfile.log
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