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Top Forums Shell Programming and Scripting Clear specific part of the screen Post 302802697 by Corona688 on Saturday 4th of May 2013 12:12:27 PM
Old 05-04-2013
Quote:
Originally Posted by chidori
s there anyway in unix to just clear a single line everytime
You can overwrite the same line every time by printing a carriage return instead of a newline, the cursor will return to the beginning of the line but not travel down to the next line.

Note this does not clear the line per se, you would need to print blank spaces or use an escape sequence.

Code:
printf "Wait for it\r"
sleep 5
printf "Ding!          \r"

Things like setting up a scrolling region inside your terminal will also prevent scrollback but are not compatible with all terminals.
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CURSES_DELETELN(3)					   BSD Library Functions Manual 					CURSES_DELETELN(3)

NAME
curses_deleteln, deleteln, wdeleteln -- curses delete single line routines LIBRARY
Curses Library (libcurses, -lcurses) SYNOPSIS
#include <curses.h> int deleteln(void); int wdeleteln(WINDOW *win); DESCRIPTION
These functions delete a single line from stdscr or from the specified window. The deleteln() function deletes the screen line containing the cursor in the stdscr. The wdeleteln() function is the same as the deleteln() function, excepting that the line is deleted from the window specified by win. All lines following the deleted line are moved up one line toward the cursor. The last line of the window is cleared. The cursor position is unchanged. If a scrolling region has been set with the setscrreg() or wsetscrreg() functions and the current cursor position is inside the scrolling region, then only the lines from the current line to the bottom of the scrolling region are moved up and the bottom line of the scrolling region cleared. The functions deleteln() and wdeleteln(win) are equivalent to winsdelln(stdscr, -1) and winsdelln(win, -1) respectively. 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_insdelln(3), curses_insertln(3), curses_scroll(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
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