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    Hi Ahmad, do you mean you would like to remove capital and lowercase letters and keep digits? Commented Sep 20, 2018 at 22:25
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    This reads like homework for school? You should at least have a try, maybe man sed for starters Commented Sep 20, 2018 at 22:31
  • Hi I want to keep the lines with digits , only lower, oly capital and digit with lower or capital both Commented Sep 20, 2018 at 22:33
  • Hi Goro plz help as my example output above Commented Sep 20, 2018 at 22:35
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    Please try harder to explain more clearly what you want.  I don’t understand your problem statement, and I can’t figure it out from the example.   Please do not respond in comments; edit your question to make it clearer and more complete. Commented Sep 20, 2018 at 22:45