junkdrawer/aws-ec2-get-ip.sh at main · peterwwillis/junkdrawer · GitHub

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#!/usr/bin/env bash
# aws-ec2-get-ip.sh - Get the IPs of running AWS EC2 instances

set -e -o pipefail
[ -n "${DEBUG:-}" ] && set -x

declare -a DI_ARGS_FILTERS=("Name=instance-state-name,Values=running")

function _debug () {
    if [ -n "${DEBUG:-}" ] ; then echo "$0: DEBUG: $@" 1>&2 ; fi
}
function _usage () {
    echo "Usage: $0 OPTIONS"
    echo ""
    echo "Only returns IPs for running instances."
    echo ""
    echo "Options:"
    echo "  -t NAME=VALUE                   Filter by tag NAME and VALUE"
    echo "  -p                              Output private IP address (default)"
    echo "  -P                              Output public IP addresses"
    exit 1
}

JQ_FILTER=".Reservations[].Instances[].PrivateIpAddress"

set_tag=0
while getopts "t:pPh" args ; do
    case $args in
        t)
            IFS='=' read -a strs <<< "$OPTARG"
            _debug "getopts: tag name ${strs[0]} value ${strs[1]}"
            set_tag=1
            DI_ARGS_FILTERS+=("Name=tag:${strs[0]},Values=${strs[1]}")
            ;;
        p)
            JQ_FILTER=".Reservations[].Instances[].PrivateIpAddress"
            ;;
        P)
            JQ_FILTER=".Reservations[].Instances[].PublicIpAddress"
            ;;
        h)
            _usage
            ;;
        \?)
            _debug "unknown $arg - $OPTARG" ;;
        *)
            _debug "something else $arg - $OPTARG" ;;
    esac
done

#aws ec2 describe-instances --query 'Reservations[*].Instances[*].PublicIpAddress[]' --output json "$@" | jq -r .[]

#if [ $set_tag -eq 0 ] ; then
#    _usage
#fi

aws --output=json ec2 describe-instances --filters "${DI_ARGS_FILTERS[@]}" \
    | jq -r "$JQ_FILTER"