#!/bin/sh
#
# Show network status continuously
# usage: nsc [port]
#

cmd="while :; do netstat -n -p tcp"
[ $# -ne 0 ] && cmd="${cmd} | nawk '
/^Proto/ { hdr = \$0 }
\$4 ~ /\\.$1\$/ && \$4 !~ /^127\\.0\\.0\\.1/ { line[n++] = \$0 }
END { if (n) {print hdr; for (i = 0; i < n; i++) print line[i]} }'"
cmd="${cmd}; sleep 5; done"
eval "$cmd"
.