Merged revisions 178445 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r178445 | tilghman | 2009-02-24 17:25:24 -0600 (Tue, 24 Feb 2009) | 5 lines
  
  Add section about the #exec command in configuration files.
  (closes issue #14540)
   Reported by: jtodd
   Patch by: jtodd, with additional notes by tilghman (license 14) 
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@178446 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/extensions.conf.sample

@@ -106,6 +106,14 @@ clearglobalvars=no
 ; that includes contexts within other contexts. The #include command works
 ; in all asterisk configuration files.
 ;#include "filename.conf"
+;
+; You can execute a program or script that produces config files, and they
+; will be inserted where you insert the #exec command. The #exec command 
+; works on all asterisk configuration files.  However, you will need to
+; activate them within asterisk.conf with the "execincludes" option.  They
+; are otherwise considered a security risk.
+;#exec /opt/bin/build-extra-contexts.sh
+;
 
 ; The "Globals" category contains global variables that can be referenced
 ; in the dialplan with the GLOBAL dialplan function: