Script to check a directory and file

if [ -d /home/r12oravis/test ]
then
echo "Directory /home/r12oravis/test is available"
cd //home/r12oravis/test
if [ -f aaa.prg ]
then
  echo "File exists"
  if [ -r aaa.prg ]
  then
     echo "File readable"
     if [ -s aaa.prg ]
     then
        echo "File is not empty"
     else
        echo "File is empty"
     fi
  else
     echo "File is not readable"
  fi
else
  echo "File doesn't exists"
fi
else
echo "Directory doesn't exists"
fi