More about initscr and lines and columns
After determining a terminal's screen dimensions,
initscr sets the variables LINES and COLS.
These variables are set from the terminfo variables
lines and columns.
These, in turn, are set from the values in the terminfo database,
unless these values are overridden by the values of
the environment $LINES and $COLUMNS.
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UnixWare 7 Release 7.1.4 - 27 April 2004