linux - how to replce empty lines with text using sed -

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How can the blank rows change with text using SAL? I tried some tricks of the previous post but it does not work, can some body help me with this?

Example file content - 

  Linux is an OS. Linux's opensource has different flavors like Firdado, Census etc. in Linux.

I want to change these blank lines with text like Hello.

Just match the start-line, if you just want the empty lines, then just the interval < / P> 

  sed -e's / ^ $ / hello / g '

If you also want to match lines with spaces, 

    > 
  sed -e 's / ^ \ s * $ / hello / g'

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