string - How can join consecutive non-empty lines using sed/awk? -


how can join consecutive non-empty lines single lines using sed or awk? example given of trying do.

input:

aaa ff gg bbb eee eee ss gg dd  aaa ff gg bbb eee eee ss gg dd  aaa ff gg bbb eee eee ss gg dd

converts 

aaa ff gg bbb eee eee ss gg dd  aaa ff gg bbb eee eee ss gg dd  aaa ff gg bbb eee eee ss gg dd

if perl okay:

$ perl -00 -pe 's/\n(?!$)/ /g' ip.txt aaa ff gg bbb eee eee ss gg dd  aaa ff gg bbb eee eee ss gg dd  aaa ff gg bbb eee eee ss gg dd

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