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z -- do special extended things
default range syntax
lines must be given line,line z <option> <stuff>
The z command command is used for doing special extended
things. Currently, the only option available is b, to draw
a box into the buffer. It works as follows:
lin,lin zb<left>[,<right>][<char>]
The two <lin>s specify where in the buffer to put the box,
<left> and <right> tell which column to which column, and
the <char> is the character to use to draw the box. As an
draws a box, OVER the text that is there. Try it on some
BLANK lines.