Invoking a nonexistent application in F13 causes a pause

If I invoke a nonexistent application in gnome-terminal on a system
running F13 this happens:
        $ sdf
        Command not found. 
        <about 1/3 second pause>
        $
If yum is running this happens:
        $ sdf
        Command not found. 
         * Waiting for package manager lock... 
        <pause till yum finishes>
        $

What's happening?  Will some application put out a message offering to
download the app?

Thanks - jon


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