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Re: creating text files with make?

From: Stephan Beal
Subject: Re: creating text files with make?
Date: Mon, 26 Apr 2010 11:33:30 +0200

On Mon, Apr 26, 2010 at 10:55 AM, Martin Mensch <address@hidden> wrote:
Til now I know how to include this config file (with include) and how to create and write to an output file (echo >> filename)
But how do I
- take in the contents of a file named by the config file
- go through this file, change placeholders controled by the config file
- copy parts several times controled by the config file
- leave out parts controled by the config file

You're looking for a tool like 'sed' or 'perl'. Those can of course be used from within makefiles. That said, to do all of the above you'll have to do a bit of research/learning about those tools. As a quick example, to change a config entry in a conventional config file you could do:

perl -i -pe 's|^(\s*KeyName\s*=(.*)|$1 New Value|' configfile

You can create loops which pull individual keys out and replace their values or, if you know the list of keys/values in adance, you can change several of them at once with a single perl call.

- and put the result into an echo command?

you may also want to look into using "cat" instead of "echo". 'cat' reads from a file or stdin and simply outputs it to stdout (like echo, except that echo sends its own arguments to stdout).

----- stephan beal

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