From: Dave Simmonds (dave.simmonds@FORTEL.COM)
Date: Thu Jul 11 2002 - 11:05:09 EDT
First, the $var= ... lines should not have a $ at the start
You can do this bit:
case $user_input in
1)
var=$var_1;;
2)
var=$var_2;;
3)
var=$var_3;;
*)
var="invalid var";;
esac
in one line:
eval var='$var_'$user_input
except it doesn't check for invalid input.
Dave Simmonds
-----Original Message-----
From: Steve Thornhill [mailto:steve_thornhill@UK.IBM.COM]
Sent: 11 July 2002 15:35
To: aix-l@Princeton.EDU
Subject: Re: Variable resolution in shell scripts
var_1="first var"
var_2="second var"
var_3="third var"
read user_input
# user enters "2"
case $user_input in
1)
$var=$var_1;;
2)
$var=$var_2;;
3)
$var=$var_3;;
*)
$var="invalid var";;
esac
echo "User selected the ${var}iation"
# expected result is: "User selected the second variation"
Steve Thornhill - IBM CLS
Int - 255104
Ext - 023 92 565104
Mob - 07778 289770
Email/Sametime - steve_thornhill@uk.ibm.com
Robert Bardos <Robert.Bardos@ZUGERKB.CH>
Robert Bardos <Robert.Bardos@ZUGERKB.CH>
Sent by: IBM AIX Discussion List <aix-l@Princeton.EDU>
11/07/2002 16:00
Please respond to IBM AIX Discussion List
To: aix-l@Princeton.EDU
cc:
Subject: Variable resolution in shell scripts
An easy one for most of you,
given a piece of code like this:
var_1="first var"
var_2="second var"
var_3="third var"
read user_input
# user enters "2"
echo "User selected the ????iation"
# expected result is: "User selected the second variation"
Is there some kind of recursive variable resolution, ie. like
$var_$user_input, that would resolve into the expected result and if yes,
how would I have to code this?
What book would you recommend for a beginner who wants to write some "more
than trivial" shell scripts? (Or should I leave it at that and learn Pearl
instead?)
TIA
Robert
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