I want to reuse the parameter I give to a shell command as an argument, e.g.
>sed 's/old/new/g'  inputfile  >  $?.outputsuffix
so that the result of sed is streamed to a file called "inputfile.outputsuffix". 
I want a feature which works interactively at the Bash command line, not inside a script. Is such a thing available?
 
    