tcpdump --version (return code: 0)
tcpdump version 4.9.0
libpcap version 1.7.4
OpenSSL 1.0.2g 1 Mar 2016
tcpdump --help (return code: 0)
tcpdump version 4.9.0
libpcap version 1.7.4
OpenSSL 1.0.2g 1 Mar 2016
Usage: tcpdump [-aAbdDefhHIJKlLnNOpqStuUvxX#] [ -B size ] [ -c count ]
[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]
[ -i interface ] [ -j tstamptype ] [ -M secret ] [ --number ]
[ -Q in|out|inout ]
[ -r file ] [ -s snaplen ] [ --time-stamp-precision precision ]
[ --immediate-mode ] [ -T type ] [ --version ] [ -V file ]
[ -w file ] [ -W filecount ] [ -y datalinktype ] [ -z postrotate-command ]
[ -Z user ] [ expression ]