https://man.netbsd.org/macppc/systat.1
systat(1) - NetBSD Manual Pages
manual pagessystatnetbsd
https://www.retro11.de/ouxr/43bsd/usr/src/ucb/systat/mbufs.c.html
4.3BSD - /usr/src/ucb/systat/mbufs.c
usrsrcucbsystat
https://iatrikostypos.com/diatrofi-gia-na-threpsete-ta-matia-sas/pinakas-systat/
pinakas systat - Iatrikostypos.com
systat