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very handy if you are in irc and absolutely don't know what these guys are talking about. this is a netbsd command, if you are lucky it exists in your distro's package database.
very handy if you copy or download a/some file(s) and want to know how big it is at the moment
you could save the code between if and fi to a shell script named smiley.sh with the first argument as and then do a smiley.sh to see if the command succeeded. a bit needless but who cares ;)
for me the above command didn't work for more than one argument but this one does