replace exact number in shell

Question

I have following matrix:

 0.380451   0.381955    0   0.237594

 0.317293   0.362406    0   0.320301

 0.261654   0.38797 0   0.350376

 0  0   0   1

 0  1   0   0

 0  0   0   1

 0  0.001504    0   0.998496

 0.270677   0.35188 0.018045    0.359398

 0.36391    0.305263    0   0.330827

 0.359398   0.291729    0.037594    0.311278

 0.359398   0.276692    0.061654    0.302256

And I want to replace only the zeros not the zeros followed by points to 0.001, how can I do that with sed or gsub?

Answer 1

Match whitespace in your replacement.

echo 0  0.001504    0   0.998496  | sed 's/0[\t ]/Z /g'

replace exact number in shell

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