missing argument to find -exec

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http://unix.stackexchange.com – I want to remove certain files using find and -exec. But unlikely bash tells me, that I'm "missing" some argument. find . -name *.png -exec rm {} /; what do I miss? same "missing argument" return for my attempt to rename some files: find . -name ic_launcher.png -exec mv {} other_name.png /; Can somebody tell me, what bash does miss, and why this command isn't successful? (HowTos)