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Scsh, pronounced "skishhhh" (rhymes with "fish"), is a Scheme shell. That is, it is a Unix shell which uses Scheme as its scripting language.

Here's an example script, from the scsh FAQ:

(define (executables dir)
  (with-cwd dir
     (filter file-executable? (directory-files dir #t))))
(define (writeln x) (display x) (newline))

(for-each writeln
   (append-map executables ((infix-splitter ":") (getenv "PATH"))))

Its Python equivalent, from above-mentioned FAQ:

import os, string, stat
for d in string.split(os.environ['PATH'], ':'):
   for f in os.listdir(d):
      mode = os.lstat(d + '/' + f)[stat.ST_MODE]
      if not stat.S_ISDIR(mode):
         print f

I haven't done any Scheme, actually. I've been scripting with CLISP. Here's a snippet from a backup script I wrote:

(defun backup ()
  (scp *src* (timestamp *dst* *file*)))

(backup)

Over time, should I write more such scripts, I might conceivably end up with a little language specific to system administration. Or I might just switch over to scsh. ;-)