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edited May 21, 2014 at 0:03

awk '/^[[:blank:]]*$/ { print; next; }; !seen[$0]++'

All you have to do is check for enan empty (really empty or just blank) line first.

awk '/^[[:blank:]]*$/ { print; next; }; !seen[$0]++'

All you have to do is check for en empty (really empty or just blank) line first.

awk '/^[[:blank:]]*$/ { print; next; }; !seen[$0]++'

All you have to do is check for an empty (really empty or just blank) line first.

answered May 20, 2014 at 23:44

awk '/^[[:blank:]]*$/ { print; next; }; !seen[$0]++'

All you have to do is check for en empty (really empty or just blank) line first.