Poor man's smokeping for OS X

smokeping.sh

#!/bin/bash
# https://gist.github.com/joshenders/52cb78bedaea6787faac

# This script uses the BSD variants of commands and is intended to
# be run on an unmodified installation of OSX.

pmset noidle &

now=$(date +%s)
duration=$((86400*3)) # 3days
end=$((now + duration))
gateway=$(traceroute -f3 -m3 -n 8.8.8.8 2>&1 | tail -1 | awk '{ print $2 }')
outfile="$(date +%Y-%m-%d)_survey.csv"

while [[ "${now}" < "${end}" ]]; do
    now=$(date +%s)
    ping=$(ping -t1 -c1 ${gateway} 2>&1)

    if [[ "$?" > 0 ]]; then
        printf "${now},-1\n" | tee -a "${outfile}"
        # 1s ping timeout on failure, so no need to sleep
        continue
    fi

    # Extract (time=14).652 ms from ping output to set $time; lazy but it works
    eval $(egrep -o 'time=[0-9]+' <<< "${ping}")
    printf "${now},${time}\n" | tee -a "${outfile}"

    sleep 1
done

gzip "${outfile}"
kill %1