I wrote cl-launch so you can use #!/usr/bin/cl with lots of options and write scripts that are either portable or implementation-specific (and trivially switch from one implementation to the other).

You can use CL for #!-scripts too. SBCL has a `--script` option for running scripts. You'll probably want to create a core with whatever libraries you need for scrips, so that the start-up time will be fast. The core will be big, but it can be shared for all scripts, so that's not much of a problem.

I wrote a short introduction to a more portable Common Lisp scripting system—made by Fare, himself—at https://ebzzry.io/en/script-lisp/

If you do scripting and like Lisp, you definitely should take a look at TXR.

I wrote TXR to basically be the "acceptable {awk, perl, ruby, Python, ...}" for Lisp-minded people. Well, for me, that is; but anyone else too.