#!/bin/sh
echo 'Dobrodosli!'
brk=false
while ! $brk; do
  read command
  case $command in
     help*)
       echo 'Trenutno su podrzane samo naredbe help i quit.'
       ;;
     quit*)
       echo 'Dovidjenja'
       brk=true
       ;;
     datum*)
       date -u
       ;;
     kreni*)
       echo 'krecem!'
       ;;
  esac
done