ipgrep.sh

#!/bin/sh
# -*-coding:utf-8-unix-*-

usage() { echo Usage: ipconfig \| `basename $0` [-v] [-m NUM] pattern 1>&2; exit 2; }

while getopts "vm:" o; do
    case $o in
        v) opt_v=! ;;
        m) opt_m=$OPTARG ;;
        *) usage
    esac
done
shift $((OPTIND-1))

[ -z "$1" ] && usage

tr -d '\r' \
    | sed -E 's/^([^ ].+:)$/~~~\1/' \
    | gawk -v opt_m=$opt_m 'BEGIN {IGNORECASE=1; RS="~~~"; ORS=""} '"$opt_v"'/'"$1"'/ {print; m++; if (opt_m == m) exit } END { exit (m == 0) }'