#Variables
vDay=$(date +%Y-%m-%d)

cat text.log | grep $vDay

vDay=$(date +%Y-%m-%d)
salida=$(cat text.log | grep $vDay)

if [[ -z "$salida" ]]
then
      echo "$salida is NULL"
else
      echo "$salida is NOT NULL"
fi

grep -q "$(date +'%Y-%m-%d')" text.log && echo Hay datos || echo No hay datos