nstat --version (return code: 0)
nstat utility, iproute2-ss151103
nstat --help (return code: 255)
Usage: nstat [OPTION] [ PATTERN [ PATTERN ] ]
-h, --help this message
-a, --ignore ignore history
-d, --scan=SECS sample every statistics every SECS
-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