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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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VTPRINTCAP(5)							File Formats Manual						     VTPRINTCAP(5)

NAME
vtprintcap - database of terminal printer control codes SYNOPSIS
/etc/vtprintcap DESCRIPTION
vtprintcap is a simple flat file database containing a list of the names of various terminals and the codes those terminals use to start and stop an attached printer (media hard copy). This database is used by vtprint(1) and related programs. Each entry is composed of three lines. The first line is a comma-delimited list of names which may be used to reference this entry. The second line the sequence of characters used by the terminal to turn on an attached hard copy device and redirect output to that device. The third line contains the sequence of characters used to turn the device off and restore normal output to the screen. An entry must have all three lines to be considered valid. Currently no comment lines are permitted to exist between these lines: such lines would be interpreted as the printer control codes themselves! The rules for selecting a terminal name are simple: you must follow the same rules as for /etc/termcap(5) names. Terminal names should be entered in /etc/vtprintcap with exactly the same names as are in /etc/termcap. The control code strings in the second and third lines of an entry are governed as follows: ANSI C style escapes for character constants (e.g. for newline) are permitted, constant strings are permitted, and quotes may be used to as delimiters in the string. (This is use- ful if you wish you use a digit immediately following a numeric escape. For example, ESC-5 should be represented as 33"5" to avoid confu- sion in with 335. In general, the rules outlined for ANSI constant escaping are enforced. Additionally, /etc/vtprintcap may contain comment lines, which are indicated by placing a hash mark (#) in the first column of the line. Remember however that entries must not be broken up by comment lines! EXAMPLE
Here is a sample entry common to DEC vt100 and vt102 terminals: # Sample vtprintcap entry for vt100 & vt102 terminals vt100, vt102 33[5i 33[4i This entry would be used whenever the user's TERM environment variable was set to "vt102" or "vt100", using ESC [5i and ESC [4i as the printer control codes to turn a printer on and off, respectively. DISTRIBUTION
vtprintcap is part of the vtprint package, which can be obtained by anonymous ftp at ftp.sdsu.edu in the /pub/vtprint directory. Please read the INDEX and README files before downloading. If you do not have ftp availability, then you can request a uuencoded copy of vtprint be sent to you via e-mail from the author. The author is also willing to make other arrangements as needed, within certain limitations. FILES
/etc/termcap /etc/vtprintcap BUGS
vtprintcap handling code currently could get confused if a printer control code is exactly the same as the name of a terminal, or contained the name of a terminal delimited by commas. As this is very unlikely to every occur, it shouldn't be a problem. SEE ALSO
termcap(5) vtprint(1) vtprint v2.0.2 25 October 1994 VTPRINTCAP(5)
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