Learn English – Period after “fax”

The correct form of your example:

It’s all about apples, oranges, bananas, etc.

Jack Lynch’s Guide to Grammar and Style states:

This one is simple enough: never double up periods. If a statement ends with “etc.” the period in the abbreviation does double duty, serving as the full stop to end the sentence. If, however, you need another mark of punctuation after an abbreviation, you can put it after the period. So:

• This was her first trip to the U.S.
  (The period does double-duty, ending both the abbreviation and the sentence.)
• Is this your first trip to the U.S.?
  (The period ends the abbreviation, but the question mark ends the sentence.)
• On her first trip to the U.S., Kristina lost her passport.
  (The period ends the abbreviation, but the sentence keeps going after the comma.)

The only thing to remember: don't double the periods. Everything else is logical enough.

I would write the first word after the period in capital case, as you did in the second sentence you wrote. The general rule of writing a word in capital case after a period is still valid even if you write a single word and then a period.

In those cases, the periods are used to give an emphasis to the single words. The pause when "reading" a period is longer than the pause used for a comma; for this reason I would not say the periods are like commas, in the examples you wrote.