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Full Discussion: Copy file and evaluate its internal variables
Top Forums Shell Programming and Scripting Copy file and evaluate its internal variables Post 302763137 by steadyonabix on Tuesday 29th of January 2013 03:22:22 PM
Old 01-29-2013
Copy file and evaluate its internal variables
Hi

I have been trying to figure a way to copy a file, (a template), that has internal variables. Using the values as defined for those variables in another script.

So a file called x -

Code:
#! /bin/bash
D=aa.$X.bb

And file y

Code:
#! /bin/bash

X=6
while read line
do
    eval echo "$line" 
done < x

Output -

Code:
brad@TX5XN:~/wip$ y

D=aa.6.bb

brad@TX5XN:~/wip$

As you can see I lose the line with the #! from file x

If I redirect to a file -

Code:
brad@TX5XN:~/wip$ cat y
#! /bin/bash

X=6
while read line
do
    eval echo "$line"  > z
done < x

I lose all of the lines except the blank line from the end of the file -

Code:
brad@TX5XN:~/wip$ cat z

brad@TX5XN:~/wip$

Is there a simple and elegant way of doing this?

Thanks

Brad
 

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LEARN ABOUT DEBIAN

gnurobots

GNUROBOTS(6)							   Games Manual 						      GNUROBOTS(6)

NAME

       gnurobots - Program a robot to explore a world

SYNOPSIS

       gnurobots [OPTION]... [FILE]

DESCRIPTION

       GNU  Robots is a game/diversion where you construct a program for a little robot, then watch him explore a world.  The world is filled with
       baddies that can hurt you, objects that you can bump into, and food that you can eat.  The goal of the game is to collect as many prizes as
       possible before you are killed by a baddie or you run out of energy.

       Programs for the robot are written in Scheme.

       GNU Robots will run the scheme file given as FILE.

OPTIONS

       -f FILE, --map-file=FILE
	      Specify the map to load.

       -s N, --shields=N
	      Set initial shields to N

       -e N, --energy=N
	      Set initial energy to N

       -V, --version
	      Output version information and exit.

       -h, --help
	      Display a summary of command-line syntax.

COPYRIGHT

	Copyright (C) 2008 Bradley Smith <brad@brad-smith.co.uk>
	Copyright (C) 1998 Jim Hall <jhall1@isd.net>

       This  is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free
       Software Foundation; either version 2, or (at your option) any later version without ANY WARRANTIES.

AUTHOR

       GNU Robots was written by Bradley Smith <brad@brad-smith.co.uk> and Jim Hall <jhall1@isd.net>

       This manual page was written by Bradley Smith <brad@brad-smith.co.uk>, for the Debian GNU/Linux system. The original  game  does  not  come
       with a manual page.

																      GNUROBOTS(6)
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