Shell Programming and Scripting

Hello,
I am needing to create a variable and assign it a value based on the value of a previosly defined variable... I am using KSH..

Example:
VAR1=COMPUTER1
I need another variable like ${VAR1}_FLAG="Y", so it would actually be COMPUTER1_FLAG="Y".

I will be looping through many values in a while loop and I need to keep track if I have already processed a value already. So my data may look like this:

COMPUTER1
COMPUTER2
COMPUTER3
COMPUTER1
COMPUTER3

Initially the value of my second variable I am attempting to create would be N, if it ever gets turned to Y because it hit a specific condition then I need to know that later on after I have looped through the values. I will go through the values again in another while loop to see which ones are Y now so then I would need to do this:
If [ ${VAR1}_FLAG = "Y" ]
then
... do stuff
fi



Hope I have explained enough detail... Thanks for any help.

Is there a reason you do not want to use arrays? Coding what you want will be a lot more inefficient. It's possible:

Code:

var=COMPUTER

for i in 1 2 3 4 5 6 7 8 9 
do
     print "$var"$i"=N"
done > t.sh
chmod +x t.sh
. t.sh

At this point COMPUTER1 is N.... COMPUTER9 is N

You can do something like that :

Code:

VAR1=COMPUTER1

flag_name=${VAR1}_FLAG
eval ${flag_name}=N
eval flag_value=\$$flag_name

# With Bash

flag_name=${VAR1}_FLAG
eval ${flag_name}='Y'
flag_value=${!flag_name}

Execution output with trace option:

Code:

+ VAR1=COMPUTER1
+ flag_name=COMPUTER1_FLAG
+ eval COMPUTER1_FLAG=N
++ COMPUTER1_FLAG=N
+ eval 'flag_value=$COMPUTER1_FLAG'
++ flag_value=N
+ flag_name=COMPUTER1_FLAG
+ eval COMPUTER1_FLAG=Y
++ COMPUTER1_FLAG=Y
+ flag_value=Y

Jean-Pierre.