log_file=/home/pascal/Documents/Backup-Smartphone/log
date=$(date "+%Y-%m-%d à %Hh%M")
envoie_sms () {
   msg="Backup Smartphone vers Desktop"$'\n'$*
   curl -G -d user=user -d pass=password --data-urlencode msg="$msg" 'https://smsapi.free-mobile.fr/sendmsg'
}

echo > $log_file
tail -fn0 $log_file | \
while read line ; do
   if [[ $line = *received* ]] ; then
      envoie_sms "Sauvegarde terminée le $date"
   fi
done