DD2-monitor/exemple.sh

#!/bin/bash

DATAFILE=/tmp/fake-datafile

#-----  collect the datas
> ${DATAFILE}
for s in $(seq 1 1000)
do
    v=$(./fake-values -s -t 1 2> /dev/null)
    echo $s $v >> ${DATAFILE}
done

#-----  do dome useless computations
awk	'
	NR==1	{ debut = $2 }
		{
		# print $2-debut, $3
		v = int($3/25);
		bucket[v]++;
		}
	END	{
		for (v=0; v<40; v++) {
			for (foo=0; foo<bucket[v]; foo++) {
				printf "-";
				}
			print "*"
			}
		}
	'                                   \
< ${DATAFILE}