Usage: ifstat [OPTION] [ PATTERN [ PATTERN ] ]
   -h, --help           this message
   -a, --ignore         ignore history
   -d, --scan=SECS      sample every statistics every SECS
   -e, --errors         show errors
   -j, --json           format output in JSON
   -n, --nooutput       do history only
   -p, --pretty         pretty print
   -r, --reset          reset history
   -s, --noupdate       don't update history
   -t, --interval=SECS  report average over the last SECS
   -V, --version        output version information
   -z, --zeros          show entries with zero activity
   -x, --extended=TYPE  show extended stats of TYPE