GAH! Bash script insanity

[Bob George]

Joshua Pollak wrote:
> [...]
> Well, this is a fairly rational idea. However, the one issue is
that
> each line is prepended by a platform modifier:
>
> win32:PARAMETER=myParam
> unix:PARAMETER=myParam

Are you trying to extract the value of a single PARAMETER, or
simply set all of them?

> I guess on Unix I could do something like:
>
> sed -e /#.*// user.cfg | sed -e /win32.*// | sed -e /macx.*// |
source

I tried the following:

1. I created a file (test.cfg) containing:

unix:PARM1="Parm1UNIX" # Line1 comment
# win32:PARM1="Parm1WINDOWS" # Line2 comment
unix:PARM2="Parm2UNIX"
win32:PARM2="Parm2WINDOWS"
unix:PARM3="Parm3UNIX" # Line5 comment
win32:PARM3="Parm3WINDOWS" # Line6 comment

2. I created a small shell script containing:

#!/bin/sh
PATH="/bin:/usr/bin:/usr/local/bin"

grep "$1:$2" | awk '
/^[^#].*$/ {
        match( $0, /(win32|unix)\:(.+)="(.+)"/, arr )
        printf "%s", arr[3]
};
'

Note that parameter values within the config file MUST be quoted.
Comments (or anything else) after the quoted portion are silently
dropped.

I suspect awk could actually eliminate the need for grep
altogether, but I've really only started working with it myself.

3. I ran the program as follows:

cat test.cfg | ./test.sh win32 PARM3

which returned:

Parm3WINDOWS

Is that along the lines of what you're after?

- Bob