Pete's Linux Advent Calendar 2008

The 18th day

Realtime Graph of ping times

#!/bin/bash

# this function continously prints on stdout the time it takes for the given
# host to answer a ping witha  one second interval
sensit() {
    local victim="$1"
    while true; do
	ping -c 1 $victim| awk '/icmp_seq/{print substr($8,6)}'
	sleep 1
    done
}

# this function prints on stdout the gnuplot commands and
# reads from stdin the data
rotate() {
    local victim="$1" xrange="$2" yrange="$3"
    echo "set title \"${victim}\""
    echo "set ylabel \"time/ms\""
    while read line
    do
	echo "plot $xrange $yrange \"-\" with lines"
	lines=`( echo "$lines" ; echo "$line" ) | tail -9`
	( echo "$lines"; echo e )
    done
}
sensit "$1" | rotate "$1" "[0:10]" "[0:100]" | gnuplot -noraise -selectionTimeout -1

Pete's Linux Advent Calendar 2008

Comments? send mail to pkruse@arcor.de