vim – delete all blank lines

To delete all blank lines in vim:

:g/^$/d

•  “:” -> enter command-line mode
• “g” -> do the action globally (apply it to all lines to which the subsequent match applies)
• “/^$/” -> regex to mean “a line is a match if it contains nothing from start to finish”
• “d” -> the action to do for matches is “delete”

Note: to see the lines which would be deleted without actually deleting them, just remove the action (“d”):

:g/^$/

Of course, you can undo any mistakes with: ESC then u

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