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Removing consecutive newlines with ed

Input file: 1 line1\ 2 line2\ 3 line3\ 4 \ 5 line4\ 6 \ 7 \ 8 line5\ Desired output: 1 line1 2 line2 3 line3 4 5 line4 6 7 line5 Is it possible with POSIX ed? Removing the trailing backslashes ...