Hello, On this page:https://www.freebsd.org/doc/en/books/handbook/ports-finding-applications.html the code "# whereis lsof" does not work as shown. Because this page:4.5. Using the Ports Collection has not met yet. So this code "# cd /usr/ports/sysutils/lsof # make install" has not run yet. Please obey chronology. Regards.