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i cut the ip add ect: 10.0.0.0/4 into octet then when i change the octet to binary, it only appear like 1010 not 00001010, how can i make the output with octet format like 00001010. I already try 

#!/bin/bash
y=00000000 
o="$(echo "obase=2; 10" | bc)"
echo "ibase=2;obase=2; $y+$o" | bc -l

But the output still 1010

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1 Answer 1

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You could zero-pad your output with printf:

$ printf '%08d\n' $(echo "obase=2; 10" | bc)
00001010
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  • so how to take that value to a variable :/ ? Commented Aug 23, 2019 at 4:44
  • With a command substitution just like in your question: o=$(printf '%08d' $(echo "obase=2; 10" | bc)) Commented Aug 23, 2019 at 4:49

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