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Half-Line Motion
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Some terminals have commands for moving the cursor vertically by
half-lines, useful for outputting subscripts and superscripts. Mostly
it is hardcopy terminals that have such features.
`hu'
String of commands to move the cursor up half a line. If the
terminal is a display, it is your responsibility to avoid moving
up past the top line; however, most likely the terminal that
supports this is a hardcopy terminal and there is nothing to be
concerned about.
`hd'
String of commands to move the cursor down half a line. If the
terminal is a display, it is your responsibility to avoid moving
down past the bottom line, etc.