From: Richard M. Stallman <rms@gnu.org>
Date: Fri, 31 Dec 1993 09:25:12 +0000 (+0000)
Subject: (shell-quote-argument): New function.
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(shell-quote-argument): New function.
---

diff --git a/lisp/subr.el b/lisp/subr.el
index 9d6e4ac3228..fce4a56e79b 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -643,6 +643,18 @@ Wildcards and redirection are handle as usual in the shell."
            (cons 'progn body)
            (list 'store-match-data original)))))
 
+(defun shell-quote-argument (argument)
+  "Quote an argument for passing as argument to an inferior shell."
+  ;; Quote everything except POSIX filename characters.
+  ;; This should be safe enough even for really weird shells.
+  (let ((result "") (start 0) end)
+    (while (string-match "[^---0-9a-zA-Z_./]" argument start)
+      (setq end (match-beginning 0)
+	    result (concat result (substring argument start end)
+			   "\\" (substring argument end (1+ end)))
+	    start (1+ end)))
+    (concat result (substring argument start))))
+
 ;; now in fns.c
 ;(defun nth (n list)
 ;  "Returns the Nth element of LIST.