what does ${VARIABLE:-0} stand for? Post: 302381832

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LEARN ABOUT SUNOS

clear

clear(3XCURSES) 					  X/Open Curses Library Functions					   clear(3XCURSES)

NAME

       clear, erase, wclear, werase - clear a window

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib 
       -R /usr/xpg4/lib -lcurses [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int clear(void);

       int erase(void);

       int wclear(WINDOW *win);

       int werase(WINDOW *win);

DESCRIPTION

       The  clear()  and  erase()  functions clear stdscr,  destroying its previous contents. The wclear() and werase() functions perform the same
       action,	but clear the window specified by win instead of stdscr.

       The clear() and wclear() functions also call the clearok() function. This function clears and redraws the entire screen on the next call to
       refresh(3XCURSES) or wrefresh(3XCURSES) for the window.

       The current background character (and attributes) is used to clear the screen.

PARAMETERS

       win	       Is a pointer to the window that is to be cleared.

ERRORS

       OK	       Successful completion.

       ERR	       An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       bkgdset(3XCURSES),  clearok(3XCURSES),  clrtobot(3XCURSES), clrtoeol(3XCURSES), doupdate(3XCURSES), libcurses(3XCURSES), refresh(3XCURSES),
       wrefresh(3XCURSES), attributes(5), standards(5)

SunOS 5.10							    5 Jun 2002							   clear(3XCURSES)