topic script issue regarding variables in Operating System - HP-UX

script issue regarding variables

System and Database — Thu, 06 Nov 2003 06:45:33 GMT

Hello,
I'm writing a script and I have a problem with variables assignements. Here is what I want to do :

#!/usr/bin/sh
LISTE_USER1="john gÃ©rard raoul"
LISTE_USER2="vincent gaston"
for USER in ${LISTE_$1}
do
.....

And the script is meant to be called with a variable : for example
# script.sh USER1

The problem is that ${LISTE_$1} doesn't work.
I get a "bad substitution" error message.

Do you have a solution for this ?

Thanks,
T

Re: script issue regarding variables

Ralph Grothe — Thu, 06 Nov 2003 07:00:57 GMT

try

for USER in LISTE_$1; do
echo \$$USER
done

do something useful instead of echo in the loop body with the variable

Re: script issue regarding variables

Ralph Grothe — Thu, 06 Nov 2003 07:08:39 GMT

forgot,
to have the loop variable evaluated in a command you might prepend the "eval" command in your loop body where you reference the variable USER.

Re: script issue regarding variables

Christian Gebhardt — Thu, 06 Nov 2003 07:38:17 GMT

Hi

as Ralph said "eval" is the key

#!/usr/bin/sh
LISTE_USER1="john gG8rard raoul"
LISTE_USER2="vincent gaston"
for USER in `eval echo \\$LISTE_\$1`
do
echo $USER
done

Chris

Re: script issue regarding variables

Mark Grant — Thu, 06 Nov 2003 07:40:39 GMT

Personally I'd use arrays such as

LISTE_USER[1]="john grard raoul"
LISTE_USER[2]="vincent gaston"
for USER in ${LISTE_USER[$1]}
do
echo $USER
done

Obviously this then gets called with arguments of 1, 2 etc

Re: script issue regarding variables

System and Database — Thu, 06 Nov 2003 07:59:15 GMT

Thank you all for your answers ! I didn't know the "eval" command.
Tom