How to replace dots "." with dashes "-" ?

"Giovanni Bronzini" <[email protected]> Thu, 22 Aug 2002 13:39:37 +0200

Newsgroups	gmane.comp.gnu.textutils.bugs
Message-ID	<006b01c249d0$988d56a0$8800000a@gigio>

I tried
echo pippo.it | tr [.] [-] 
but I obtained 
pippo\it

?

Thanks

Giovanni

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