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The Termcap Library

3.19 Half-Line Motion

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.