Hi
I am new to awk, and want some input for the below :-

When trying "sub" function, i want to replace a text from abc.txt with a given input,
Eg :-
Input :
0019,ABC,data1
0019,ABC,data1
0019,ABC,data1
0019,ABC,data1

Here I am trying to replace 0019 with 0301( this is a variable) using awk, sub command.

Say the input is $read_val (0301 for e.g)
when trying the below command
awk '{sub ('/0019/',"/$read_val/") ; print }' abc.txt

O/P :-
0019 is getting replaced with "$read_val" as string.

Is there some way to replace 0019 with the value of $read_val using awk.

Thanks.