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Código:

# Global variables
film=/opt/etc/film/film.txt
export film

confirm()
{
  echo -en "$@"
  read ans
  ans=`echo $ans | tr '[a-z]' '[A-Z]'`
  if [ "$ans" == "Y" ]; then
    return 0
  else
    return 1
  fi
}

num_lines()
{
  grep -i "$@" $film|wc -l| awk '{ print $1 }'
}

find_lines()
{
  # Busca lineas de entrada $1
  res=-1
  if [ ! -z "$1" ]; then
    grep -i "$@" $film
    res=$?
  fi
  return $res
}

list_items()
{
  # Lista los resultados encontrados
  if [ "$#" -eq "0" ]; then
    echo -en "Buscar usuario: (en blanco muesta toda la lista): "
    read search
    if [ -z "$search" ]; then
      search="."
    fi
    echo
  else
    search="$@"
  fi
  find_lines "${search}" | while read i
  do
    echo "$i" | tr ':' '\t'
  done
  echo -en "Encontrados: "
  num_lines "$search"
}

add_item()
{
  echo
  echo
  echo
  echo "          NUEVA PELI"
  echo " COMPLETA TODOS LOS DATOS"
  echo "  - AÑO MES DIA DIRECTOR TIPO - "
  echo
  echo -en "Nombre: "
  read name
  find_lines "^${name}:"
  if [ `num_lines "^${name}:"` -ne "0" ]; then
    echo "Pelicula, $name ya existe en el fichero."
    return
  fi
  echo -en "Año: "
  read "ano"
  echo -en "Director: "
  read filmaker
  echo -en "Genero:"
  read genre
  echo -en "Calificacion:"
  read calification

  # Confirmacion
  echo "${name} AnoPelicula=${ano}
        ${calification}, ${filmaker}, ${genre}" >> $film
  echo
  echo
  echo -en "--> ALTA FILM"
  echo
  echo
}

locate_single_item()
{
  echo -en "Peli a buscar: "
  read search
  n=`num_lines "$search"`
  if [ -z "$n" ]; then
    n=0
  fi
  while [ "${n}" -ne "1" ]; do
    #list_items "$search"
    echo -en "${n} peli encontrada. Selecciona una "
    case "$n" in
      "0") echo "menos" ;;
      "*") echo "mas" ;;
    esac
    echo "especifica un patron de busqueda (q para volver al menu anterior): "
    read search
    if [ "$search" == "q" ]; then
      return 0
    fi
    n=`num_lines "$search"`
  done
  return `grep -in $search $film |cut -d":" -f1`
}

#remove_item()
#{
#  locate_single_item
#  search=`head -2 $film`
#  if [ -z "${search}" ]; then
#       return
#  fi
#  list_items "$search"
#  confirm "Borrar?"
#  if [ "$?" -eq "0" ]; then
#    grep -v "$search" $film > ${film}.tmp ; mv ${film}.tmp ${film}
#  else
#    echo "NO BORRADO"
#  fi
#}

edit_item()
{
  locate_single_item
  search=`head -$? $film | tail -1|tr ' ' '.'`
  if [ -z "${search}" ]; then
        return
  fi
  list_items "$search"
  thisline=`grep -i "$search" $film`
  oldname=`echo $thisline|cut -d"" -f1`
  oldano=`echo $thisline|cut -d"," -f2`
  oldfilmaker=`echo $thisline|cut -d"," -f3`
  oldcalification=`echo $thisline|cut -d"," -f4`
  oldgenre=`echo $thisline|cut -d"," -f5`

  echo "BUSCAR : $search"
  grep -v "$search" $film > ${film}.tmp ; mv ${film}.tmp ${film}
  echo -en "Pelicula [ $oldname ] "
  read name
  if [ -z "$name" ]; then
    name=$oldname
  fi
  find_lines "^${name}:"
  if [ `num_lines "^${name}:"` -ne "0" ]; then
    echo "La pelicula, $name esta en el fichero."
    return
  fi
  echo -en "ano [ $oldano ] "
  read ano
  if [ -z "$ano" ]; then
    ano=$oldano
  fi
  echo -en "Pelicula [ $oldfilmaker ] "
  read filmaker
  if [ -z "$filmaker" ]; then
    filmaker=$oldfilmaker
  fi
  echo "${name}:${ano}:${filmaker}" >> $film
}