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In my latest code I have not used substitute function. so there is no chance of X being replaced by ,

Please show us what you tried.



It is very difficult to program any script when you are...

Does you input comes from a file that is dynamically generated (so that its content changes) ?
or is your input taken from a configuration file whose content does not change ? (configured just...

You can create an array. The basic way to create it is:

set -A ARRAYNAME $(some process with linewise output)

Run the following to get a feeling for this. I suggest you read the man page of...

Try echo $INPUT | { IFS=":," read ST1 A ST2 B ST3 C; echo $A $B $C $((A+B+C)); }
1 3 3 7

Since ST1 ST2 and ST3 are unused you just can scan one variable instead of 3
... | read x A x B x C
instead of
... | read x A y B z C

One more way
$ echo $INPUT
XXX:1,XXX:3,XXX:3
$ set --...

First off: you shouldn't use backticks any more, they are deprecated in every modern shell. But that just as an aside, it shouldn't cause your problem.

The last "number" might be no number at all,...

In your code ' position is wrong it should be like
awk '{sub()}' final.txt

try
awk -F, 'NR==FNR{A[$1]=$NF;B[$NF]=$(NF-1);next}{$(NF-1)=A[$3];$(NF-2)=B[$(NF-1)];sub(",XX,",",")}1' OFS="," file2...

Please check my previous post.
I have corrected the code.

awk -F, 'NR==FNR{ #Reading file1

A[$1]=$0;next} #Assign $0 to array A with index $1. Using next it skips the next code.

A[$2] # Check If the A[$2] is present or not....

awk -F',' 'NR==FNR {a[$1]=$2","$3; next} a[$2] {print $1","$2","a[$2]}' text1.txt text2.txt

have you tried with nawk ?