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  1. or download this
    one=1
two=2
three=3
xyz=20
  2. or download this
    one=1
two=2
three=3
xyz=21
  3. or download this
    perl -p -i.bak -e 's/$1/$a/ if ((/xyz\s*=\s*([0-9]*)\s*/)&&($a=$1+1))'
+ test.data