ECHO "Text", sleep 2s, erase "Text", then "ECHO "Text 2", etc

I have a shell script that simply outputs events on a calendar like:

Event 1
Monday 10:00PM - 11:00PM

Event 2
Monday 11:00PM - 11:30PM

I would like 开发者_开发问答the output to display one event at a time, then wait 2 seconds and replace the first event with the second - then loop back to the 1st. Is this possible?

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Do you mean something like that?

while true;
  do echo -en "\rText 1"
  sleep 2
  echo -en "\rText 2"
  sleep 2
done

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Replacing means going back and overwriting it. Not all terminals support this. But you may experiment with tput. Look for tput cup to position the cursor.