COLUMNS
The number of columns in the terminal if set. This is usually automatically configured by querying the kernel.
CURSES_TRACE_MASK
An integer mask that enables specific debugging traces. Enabled only in the debug build of curses.
CURSES_TRACE_FILE
A file where to output debugging information. Enabled only in the debug build of curses.
ESCDELAY
The maximum delay in milliseconds between characters in multi-character keystrokes (such are arrow keys) where the adjacent characters are considered part of the same multi-character sequence. The default is 300 milliseconds.
LINES
The number of lines in the terminal if set. is usually automatically configured by querying the kernel.
TERM
The terminal type of the current terminal.