tool to edit master.cf

[Robert Moskowitz]

I am not finding a tool to edit master.cf similar to 'postconf -e' for 
main.cf.

It seems in my reading that in postfix 2.9, postconf can display 
master.cf, but not edit it?  And, of course, so far I am working with 
postfix 2.6.6.

Just looking for a nice way to build up a script of changes I am making 
to master.cf (like uncomment submission and add dovecot support).

Yes, I suspect I can pull out my SED manual and use it. <Shudder>