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Top Forums Shell Programming and Scripting Control cursor position also at bottom of window Post 303043705 by Ralph on Tuesday 4th of February 2020 02:18:38 PM
Old 02-04-2020
Quote:
Originally Posted by wisecracker
I did quote early on in this thread that some terminals do not respond correctly to some terminal escape codes. Some of those escape codes will not work at all.

So in the first part the outside parentheses create an array in advanced shells like bash so therefore longhand:
Code:
Last login: Tue Feb  4 16:17:10 on ttys000
AMIGA:amiga~> term_size=($( stty size ))
AMIGA:amiga~> 
AMIGA:amiga~> printf "%b\n" "${term_size[0]}"
24
AMIGA:amiga~> 
AMIGA:amiga~> printf "%b\n" "${term_size[1]}"
80
AMIGA:amiga~> _

As for the second 'printf' line, changing the values 24 and 80 to say 30 and 120 will expand the terminal size on certain terminals, (xterm as an exmaple), to that size for the duration of that terminal session. Of course calling it again with 24 and 80 restores it back to the original.
IF and a big if, it doesn't work then many of those terminal commands in the URLs won't work either.

Array... right. I wasn't thinking straight. Was early in the morning then.
Yes, probably quite a few of these escape codes won't work everywhere. Fortunately I don't need to resize the terminal. All I want is to keep the cursor in place until an acceptable answer arrives.
What about those code in man console_codes? Can't those be used to program in a reasonably safe / portable way in Bash?
 

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curs_deleteln(3CURSES)					     Curses Library Functions					    curs_deleteln(3CURSES)

NAME
curs_deleteln, deleteln, wdeleteln, insdelln, winsdelln, insertln, winsertln - delete and insert lines in a curses window SYNOPSIS
cc [ flag ... ] file ... -lcurses [ library ... ] #include <curses.h> int deleteln(void); int wdeleteln(WINDOW *win); int insdelln(int n); int winsdelln(WINDOW *win, int n); int insertln(void); int winsertln(WINDOW *win); DESCRIPTION
With the deleteln() and wdeleteln() routines, the line under the cursor in the window is deleted; all lines below the current line are moved up one line. The bottom line of the window is cleared. The cursor position does not change. This does not imply use of a hardware delete line feature. With the insdelln() and winsdelln() routines, for positive n, insert n lines into the specified window above the current line. The n bot- tom lines are lost. For negative n, delete n lines (starting with the one under the cursor), and move the remaining lines up. The bottom n lines are cleared. The current cursor position remains the same. With the insertln() and insertln() routines, a blank line is inserted above the current line and the bottom line is lost. This does not imply use of a hardware insert line feature. RETURN VALUES
All routines return the integer ERR upon failure and an integer value other than ERR upon successful completion. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
curses(3CURSES), attributes(5) NOTES
The header <curses.h> automatically includes the headers <stdio.h> and <unctrl.h>. Note that all but winsdelln() may be macros. SunOS 5.11 31 Dec 1996 curs_deleteln(3CURSES)
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