On 2005-06-16, michael wrote:
> Folks
>
> For some reason out of my control I need to pass the name of an env var
> to a bash script and then, within said script, determine the value of
> that env var.
>
> For example if my script is 'myScript' and assume I've done
>
> $ export INPUTFILE=/tmp/whateverandaday
>
> then how inside myScript do I get the value of INPUTFILE when all I can
> pass to the script is the name of the env var, eg
>
> $ ./myScript INPUTFILE
>
> (and no I cannot pass $INPUTFILE directly for another reason [a later
> part of the script calls a program which needs the env var name not its
> value])
>
> I've tried various combos inside the script like
> echo ${$1}
> but they don't work (the nearest I can get is
> set | grep $1
> but that's ugly IMHP)
In bash you can do:
var=$1
INFILE=${!var}
To make it portable, so that your script can be run in any
Bourne-type shell:
eval "INFILE=\${$1}"
--
Chris F.A. Johnson <http://cfaj.freeshell.org>
==================================================================
Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress
<http://www.torfree.net/~chris/books/cfaj/ssr.html>
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