Blank Lines
1 Delete all the leading blank lines at the top of a file. 2000.10.04
2 Delete all the trailing blank lines at the end of a file. 2000.10.05
3 Squeeze consecutive blank lines to one. 2000.10.15
4 Replace blank lines with dashed ones,
but consecutive blank one are replaced with only one dashed line.
2004.09.16
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