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:
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?
This is what I do - the output of my script:
When a user enters an answer other than Y, y, N, n or <Enter> - for example 'z' above - then the cursor is supposed to stay where it is until an acceptable answer comes.
That has to work everywhere on the screen.
The problem I had was that the carriage return moved the cursor to the next line, one line below the question. I first fixed it for everywhere except the last line of the window and that's when I posted my original question.
This version works for me now:
Could be condensed a bit but this is easier to read.
It works here. Does it work on your system?
It's still the same as what I posted earlier. A bit longer than it has to be because of all the ifs and comments. I like the way you used parameter expansion in your version, but your version didn't scroll right on my system - an ordinary terminal emulator running Bash 5 on a Debian Linux.
Here my currently final version again:
Only complaint now is that when the question is asked at the very bottom of the window the cursor still jumps to the next line, the window scrolls but the cursor jumps back to the end of the question. That can be avoided by using read -n 1 - as wisecracker suggested - but I like to use the Enter key to confirm.
Does it run the same way on your system?
Last edited by Ralph; 02-05-2020 at 10:24 AM..
Reason: typos
Hi there.
It's easier to explain this with a pseudo code, I hope this makes sense:
var1=hello
echo $var1
some kind of loop
echo loop counter
done
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hello123456789
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_
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