For e. g., less has option --squeeze-blank-lines (or -s in short) and it squeezes multiple blank lines into single blank line, buuut, less wouldn't do this being used as filter (i. e., having its output sent not to a tty).Similar option can be found in cat too, it's also called -s usually, and it also makes single blank line instead of several.What about removing empty/blank lines all together? One approach I can think of is using grep, but may be I've overlooked something more simple?
Most elegant pipe to get rid of empty lines you can think of?
text processing