Yes I am.
In fact, all my actions are done in /opt
cd /opt
systemctl stop mattermost
wget https://releases.mattermost.com/5.8.0/mattermost-team-5.8.0-linux-amd64.tar.gz
tar -x --transform=‘s,[1]+,\0-upgrade,’ -f mattermost*.gz
mv mattermost/plugins/ mattermost/plugins~
chown -hR mattermost:mattermost mattermost-upgrade
cp -an mattermost-upgrade/. mattermost/
rm -rf mattermost-upgrade/
systemctl start mattermost
^/ ↩︎