Pings multiple hosts concurrently and prints results in CSV format

mping.sh

#!/bin/bash

# this program is placed into the public domain
# https://gist.github.com/microlinux/77feda4449a8041a19a7

#
# THIS FILE MUST BE IN YOUR SYSTEM PATH
#

# defaults
COUNT=5
INTERVAL=1
WORKERS=25

targets=''

function usage()
{
	echo
    	echo 'ping targets concurrently and display ordered csv results'
	echo
    	echo 'usage: mping.sh [option] ... [target] ...'
	echo
	echo 'options:'
	echo '  -c ping count (5)'
	echo '  -i ping interval (1)'
	echo '  -w max workers (25)'
	echo
	echo 'examples:'
	echo '  mping.sh -c10 -i.5 google.com yahoo.com askjeeves.com bing.com'
    	echo '  cat targets.conf | mping.sh -w50'
	echo
	echo 'output:'
    	echo '  <target>,<sent>,<recvd>,<pctloss>,<min>,<avg>,<max>'
	echo

	exit 0
}

# if the first arg is mpingworker, this is a ping request
if [ $1 = 'mpingworker' ]
then
	output=$(ping -c "$3" -i "$4" -W 1 -q "$2" 2> /dev/null)

	if [ -z "$output" ]
	then
		echo "$2,,,,,"
		exit 0
	fi

	recvd=($(grep -o '[0-9]\+ received' <<< "$output"))
	recvd="${recvd[0]}"

	if [ "$recvd" -eq 0 ]
	then
		echo "$2,$3,0,100,,,"
		exit 0
	fi

	stats=($(grep -o '[0-9.]\+/[0-9.]\+/[0-9.]\+' <<< "$output" | tr '/' ' '))

	# sed 's/....$//' chops off the fractional part of an rtt
	min=$(sed 's/....$//' <<< ${stats[0]})
	avg=$(sed 's/....$//' <<< ${stats[1]})
	max=$(sed 's/....$//' <<< ${stats[2]})

	pctloss=$(grep -o '[0-9]*%' <<< "$output" | cut -d ' ' -f 6 | tr -d '%')

	echo "$2,$3,$recvd,$pctloss,$min,$avg,$max\n"

	exit 0
fi

# if we get here, this is the main process
while getopts 'hc:i:w:' opt
do
	case "$opt" in
		h)
			usage
			exit 0
			;;
		c)
			if [ ! -z "$OPTARG" ]
			then
				COUNT="$OPTARG"
			fi
			;;
		i)
			if [ ! -z "$OPTARG" ]
			then
				INTERVAL="$OPTARG"
			fi
			;;
		w)
			if [ ! -z "$OPTARG" ]
			then
				WORKERS="$OPTARG"
			fi
			;;
	esac
done

# chop opts from arg list
shift $((OPTIND - 1))

if [ $# -eq 0 ]
then
	# if no args left, read targets from stdin
	while read target
	do
		targets="$targets\n$target"
	done
else
	# otherwise use remaining args as targets
    for target in "$@"
    do
        targets="$targets\n$target"
    done
fi

# mass ping targets
results=$(echo -e "$targets" | xargs -n 1 -I ^ -P "$WORKERS" ./mping.sh mpingworker ^ "$COUNT" "$INTERVAL")

# convert targets into an array
targets=($(sed 's/\\n/ /g' <<< "$targets"))

# display results in the order targets were given
for target in "${targets[@]}"
do
	echo -e "$results" | grep "$target" 2> /dev/null
done