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Thanks All.. But I could get it in one line cmd ...

sed ':a;N;$!ba;s/\n2/~~~~~/g' drc_file.txt | sed ':a;N;$!ba;s/\n/ /g' | sed 's/~~~~~/\n2/g' > test.txt

Thanks for the code. But I have other valid records with NF =9, that should not be joined with this. So when I ran your cmd, lines after the bottom most line in my prev note gets appended with next...

@derekludwig - Yes , it is fixed number of fields & new line at end of line

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Hi - I have req to join broken lines and remove empty lines but should NOT be in one line. It has to be as is line by line. The challenge here is there is no end of line/start of line char.
thanks...