This executes script with a given set of env cars, what I was talking about is 
replacing placeholders in config with values from env vars.

What would look in a shell like 

tpl() {
  eval “cat <<EOF

tpl </etc/config.tpl >/etc/config

But safer 😊

From: Laurent Bercot
Sent: 16 October 2016 21:14
Subject: Re[4]: How to write an execline helper in execline?

>Hi, slightly among the lines of this suggestion, is there anything to 
>help templating files with a given set (or subset) of env vars? This 
>would be nice addition for s6 overlay

  I can't think of anything simpler than

s6-envdir dir_containing_all_variable_definitions
   import -u variable1
   import -u variable2
   import -u variable3

  Is that the kind of thing you're looking for?


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