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How is the important number generated? If it is in a shell script, you can use typeset -Z15 variable to automatically pad it, if that helps.

Can you tell us more about the overall process? There...

Hello,

You haven't showed us the input file in first post of this thread, I have answered according to your question. Nevertheless you can try following. If following doesn't help you then...

With AWK you'll need something like this:

awk '{gsub("hello", "bye")}1' test.dat > test.dat_tmp &&
mv test.dat_tmp test.dator this (not recommended):

{ rm test.dat &&
awk...