Sistemi Operativi - 09/09/2009 - Es. 5

#!/bin/bash
# Uso: istogramma.sh dati.txt

sort -k 1,1 $1 > output.tmp
max=$(tail -1 output.tmp|awk '{print $1}')

i=1
puntatore=1
rm -f result.txt
while (( $i<=$max ))
do
    linea=$(head -$puntatore output.tmp | tail -1)
    numero=$(echo $linea|awk '{print $1}')
    if (( $numero == $i ))
    then
        stringa=""
        asterischi=$(echo $linea|awk '{print $2}')
        for (( j=0 ; j < asterischi ; j++ ))
        do
            stringa="$stringa*"
        done
        echo "$i $stringa" >> result.txt
        puntatore=$(( $puntatore+1 ))
    else
        echo "$i" >> result.txt
    fi
    i=$(( $i+1 ))
done

rm -f output.tmp