Executing a command on every file in a directory
 

I would like to automate my command-line operations a little...
I have a command that asks for a file at stdin as such:

command (lots of arguments) < file

But I have to do this for every file in the directory. Since wildcards are obviously not allowed:
command (lots of arguments) < *

Is there an easy way to accomplish this?

Maybe something like this:

Yep! That worked!!

Thanks