When rdctl factory-reset is launched from the UI, it writes its stdout into
TMP/rdctl-stdout.txt
where on linux TMP is usually /tmp,
on macOS it's given by $TMPDIR
and on Windows by %TEMP%(command shell) or $env:TEMP(powershell).
This is most useful during development. When the UI runs in debug mode, it spawns rdctl factory-reset with the --verbose option.
We can't write the output into the logs directory as factory-reset deletes it.