display system statistics with systat on bsd systems

systat utility displays system statistics on bsd systems (freebsd, dragonfly, etc.).
system statistics includes swap, network interface, disk I/O , virtual memory (vmstat), network utilitzation (mbuf), TCP/IP statistics, network connections (netstat), icmp.

here is some systat options:
pigs,icmp,ip,tcp,ifstat,iostat,swap,mbufs,vmstat,netstat.
following is sample output for "systat -iostat" command: