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Vi ---> Removing blank lines

Blank lines can be removed from a file with any of the following: 


    :v/./d
or 


    :g/^$/d
or 


    :%!cat -s
If you want to get rid of duplicate blank lines, but leave the first blank line intact, try: 


    :%!sed /./,/^$/!d
Be aware that you may need to get rid of trailing whitespace first. This can be accomplished with 


    :%s/[ ^I]*$/

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