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With awk:

awk '{ORS=" ";}; !NF{ORS="\n"};1' file

The ORS variable specifies the output record separator. If the line number is zero (the line is empty) then the record separator should be a newline, else a space. The 1 at the end just means a positive condition, so awk prints the whole line.

With awk:

awk '{ORS=" ";}; !NF{ORS="\n"};1' file

The ORS variable specifies the output record separator. If the number of fields is zero (the line is empty) then the record separator should be a newline, else a space. The 1 at the end just means a positive condition, so awk prints the whole line.

With awk:

awk '{ORS=" ";}; !$0{ORS="\n"};1' file

The ORS variable specifies the output record separator. If the line if empty ($0 is not set) then the record separator should be a newline, else a space. The 1 at the end just means a positive condition, so awk prints the whole line.

With awk:

awk '{ORS=" ";}; !NF{ORS="\n"};1' file

The ORS variable specifies the output record separator. If the line number is zero (the line is empty) then the record separator should be a newline, else a space. The 1 at the end just means a positive condition, so awk prints the whole line.

With awk:

awk '{ORS=" ";} !$0{ORS="\n"}1' file

The ORS variable specifies the output record separator. If the line if empty ($0 is not set) then the record separator should be a newline, else a space. The 1 at the end just means a positive condition, so awk prints the whole line.

With awk:

awk '{ORS=" ";}; !$0{ORS="\n"};1' file

The ORS variable specifies the output record separator. If the line if empty ($0 is not set) then the record separator should be a newline, else a space. The 1 at the end just means a positive condition, so awk prints the whole line.