I use this. This makes the "shell" command work in SBCL, and does nothing in CLISP or any other implementation. #+sbcl (defun shell (x) (run-program "

I use this. This makes the "shell" command work in SBCL, and does nothing in CLISP or any other implementation. #+sbcl (defun shell (x) (run-program "/bin/sh" (list "-c" x) :output t)) Tell me if you want it to work in an implementation other than CLISP or SBCL, and if I can install it on my computer, then I'll figure it out.