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st: replacing values of a variable

From   James Bernard <>
Subject   st: replacing values of a variable
Date   Sat, 9 Mar 2013 18:27:46 +0800

Hi folks,

I am trying to copy values of a string variable into another one if a
condition is met. I keep getting "0 real changes made"

var 1                   var2
---------               ---------
jan-2000            jan-2000
march-2000       same year
june-1999          june-1999

replace var2=var1 if var2=="same year"

what is wrong with this code?

Thanks in advance

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