File: wait-until-alive

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#!/bin/sh

set -eu

if test $# -lt 1; then
    cat 1>&2 <<EOF
Usage: $0 <dest> [ -I <interface> ]
EOF
    exit 1
fi

# Run ping so that it exits with success the moment it gets a single
# packet pack.
ping="ping -n -c 1 -w 4 $@"

if output=$($ping 2>&1); then
    echo "destination $@ is alive"
    exit 0
else
    echo "$ping"
    echo "$output"
    echo "destination $@ is dead"
    exit 1
fi