Linux shell while

• sh

  count=1
  while [ $count -le 5 ];
  do
      echo 1234567890abcdefghqwertyuiopdasdk > /dev/ttyS1 &
      echo 1234567890abcdefghqwertyuiopdasdk > /dev/ttyS3 &
      echo 1234567890abcdefghqwertyuiopdasdk > /dev/ttyS5 &
      echo 1234567890abcdefghqwertyuiopdasdk > /dev/ttyS7 &
      echo 1234567890abcdefghqwertyuiopdasdk > /dev/ttyS9 &
      echo 1234567890abcdefghqwertyuiopdasdk > /dev/ttyS11 &
      echo 1234567890abcdefghqwertyuiopdasdk > /dev/ttyS13 &
      echo 1234567890abcdefghqwertyuiopdasdk > /dev/ttyS15 &
      sleep 1
  
      let count+=1
      echo $count
  done