#!/usr/bin/bash IPFILE="/etc/ips" IPS=$(cut -d\: -f1 ${IPFILE}) is_ip_aliased() { local ip=$1 if /usr/sbin/ip a |grep -q "${ip}/"; then echo "ipaliases status - OK" else echo "ipaliases status - NOT OK" fi } ipaliase_check() { while read ip; do is_ip_aliased ${ip} done <<< "${IPS}" } if ipaliase_check | grep -q NOT; then echo "ipaliases status - NOT OK" exit 2 else echo "ipaliases status - OK" exit 0 fi