LISP/CCL: Passing a quotation mark as argument to 'run-program'

Question

What is the correct way of passing a quotation mark as an argument to Clozure CL's run-program? Take the simple example of calling echo ", which should return ".

However, when I try to run this command by using ccl:run-program as shown below, the following string is returned: "\\" rather than "\"". Any ideas on how to tackle this issue? The final goal is to pass a string surrounded by quotation marks to the program as argument.

 (with-output-to-string (stream)
   (ccl:run-program "echo" (list  "\"") :output stream)
 )

Answer 1

When trying your code, I see the following output:

Clozure Common Lisp Version 1.12 (v1.12) LinuxX8664

For more information about CCL, please see http://ccl.clozure.com.

CCL is free software.  It is distributed under the terms of the Apache
Licence, Version 2.0.
? (with-output-to-string (stream)
   (ccl:run-program "echo" (list  "\"") :output stream)
 )
"\"
"
? 

But some characters are escaped in Common Lisp strings, so in order to be sure about what the string holds, here are different options:

? (coerce * 'list)
(#\" #\Newline)

or,

? (describe **)
"\"
"
Type: (SIMPLE-BASE-STRING 2)
Class: #<BUILT-IN-CLASS SIMPLE-BASE-STRING>
Length: 2
0: #\"
1: #\Newline`

So as far as I can tell, the output is as desired.