04-24-2011
Thanks a lot mirni for such a nice explanation. If I have understood clearly then first it checks if $1 is there or not, in a way to check when it reaches end of file. But, I am not clear what is the purpose of assigning third column to $1?
and also its not clear to me which part of the code actually checks when the value of $1 changes?
I'll really thankful if you or vgersh can explain this.
Thanks! again.
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LEARN ABOUT NETBSD
curses_clear
CURSES_CLEAR(3) BSD Library Functions Manual CURSES_CLEAR(3)
NAME
curses_clear, clear, wclear, clearok, clrtobot, clrtoeol, erase, werase, wclrtobot, wclrtoeol -- curses clear window routines
LIBRARY
Curses Library (libcurses, -lcurses)
SYNOPSIS
#include <curses.h>
int
clear(void);
int
clearok(WINDOW *win, bool flag);
int
clrtobot(void);
int
clrtoeol(void);
int
erase(void);
int
wclear(WINDOW *win);
int
werase(WINDOW *win);
int
wclrtobot(WINDOW *win);
int
wclrtoeol(WINDOW *win);
DESCRIPTION
These functions clear all or part of stdscr or of the specified window.
The clear() and erase() functions erase all characters on stdscr. wclear() and werase() perform the same function as clear() and erase(),
respectively, excepting that the specified window is cleared.
By setting flag to TRUE, the clearok() function is used to force the next call to wrefresh() to clear and completely redraw the window given
in win.
The function clrtobot() will clear stdscr from the current row to the bottom of the screen. clrtoeol() will clear stdscr from the current
column position to the end of the line. wclrtobot() and wclrtoeol() are the same as clrtobot() and clrtoeol(), respectively, excepting the
window specified is operated on instead of stdscr.
RETURN VALUES
Functions returning pointers will return NULL if an error is detected. The functions that return an int will return one of the following
values:
OK The function completed successfully.
ERR An error occurred in the function.
SEE ALSO
curses_refresh(3)
STANDARDS
The NetBSD Curses library complies with the X/Open Curses specification, part of the Single Unix Specification.
HISTORY
The Curses package appeared in 4.0BSD.
BSD
August 12, 2002 BSD