Ending a sentence with an abbreviation and periods... ??

If you end a sentence with an abbreviation, then does the period that follows that abbreviation play a double role as the period to end that sentence?

For example:

"I was asked to go to the store and purchase party supplies, such as plates, cups, napkins, etc."

vs.

"I was asked to go to the store and purchase party supplies, such as plates, cups, napkins, etc.."


I recall only using and reading the former, but I'm wondering if they're both technically correct, or perhaps somehow or other the latter is correct.


Thanks in advance!