https://emptyhammock.com/blog/lsof-process-group-selection-troubles-on-os-x-too.html
lsof process group selection troubles on OS X too?
os xlsofprocessgroupselection
https://emptyhammock.com/blog/freebsd-lsof-process-group-duplication.html
FreeBSD lsof process group duplication????
freebsdlsofprocessgroupduplication