Characters That Cannot Be Used In A CIFS Program-Type Automount

Issue

A customer wants to setup an automount CIFS mount point of type program.  See "map-type" in the auto.master(5) man page.  To this end, /etc/auto.master contains:

/mnt/executable  /etc/testmap.sh

and /etc/testmap.sh contains:

#!/bin/bash
echo '-fstype=cifs,nocase,rw,file_mode=0660,dir_mode=0775,vers=3.02,user=cifsuser,password=pass\\\&word \'
echo ' /cifsmnt ://cifsserver.example.com/test'

The customer can escape most special characters (like the ampersand in the above example), but there are three that will not escape correctly:  the comma (,), the single-quote (') and the double-quote (").