#!/bin/sh

# Kontrola vstupneho suboru
read x
if [ -z "$x" ] || [ "${x:0:5}" != "From:" ]
then
        echo "Na prvnim radku musi byt From:adresa"
        exit 1
fi

# Pekne odfiltrovnie 'From:' od Pavla Z. + odfiltrovanie vsetkych whitespace z emailu: pouzitite :l ako label, na zaver 'branch' = skok nazad na l
adresa=$(echo "$x" | sed 's/From\:/''/;:l;s/"\s"/''/;tl')
echo $adresa

read y
if [ -z "$y" ] || [ "${y:0:8}" != "Subject:" ]
then
        echo "Na druhem radku musi byt Subject:prikaz"
        exit 1
fi

prikaz=$(echo "$y" | sed 's/Subject:/''/')

read z
if [ -n "$z" ]
then
        echo "Spatny format vstupu"
        exit 1
fi

# Napad spracovania stdin od Lady K. - riesi problem ak vstup nie je ukonceny \n (dodatocne priradenie >> ./input)
while read line
do
    echo "$line" >> ./input
done
echo  "$line" >> ./input

# Vykonanie prikazu
$y < ./input > ./output

# Odoslanie spatneho emailu
val=$?
mail -s $val $x <./output

---

Xtra men:

Jan K., Pavel Z., Lada K., Tereza K.