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Full Discussion: Control cursor position also at bottom of window
Top Forums Shell Programming and Scripting Control cursor position also at bottom of window Post 303043711 by Ralph on Tuesday 4th of February 2020 08:41:57 PM
Old 02-04-2020
Quote:
Originally Posted by wisecracker
Hi Ralph..
Is this what you are trying to do?
Code:
#!/bin/bash
# Linux Mint 19, default bash terminal.
clear
echo ""
echo ""
printf "%b" "This is a test line.\033[s\n"
sleep 2
echo ""
echo ""
printf "%b" "\033[u\033[1A\n"
 echo "We are here.         "

This is what I do - the output of my script:
Code:
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
Do you wish to continue? [Y|n] z

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:
Code:
#!/bin/bash

function askYesOrNo {
        printf "\e[1;31;47m$1 [Y|n]\e[0m "      # print $1 in color
        printf "\e[s"                           # save cursor x-pos

        while true ; do
                read answer
                if [ -z "$answer" ] ; then
                        return 0
                elif [ "$(tr -d "NnYy" <<< $answer)" != "$answer" ] ; then
                        break
                fi

                # How many lines in this window?
                LINES=$(tput lines)

                # find cursor y-position ( line number )
                printf "\e[6n" ; read -sd R POS
                CURPOS=${POS#*[}; CUR_Y=${CURPOS%;*}

                if [ "$CUR_Y" -eq "$LINES" ] ; then
#                       printf "\e[u\e[1A\e[K" 
                        printf "\e[u\eM\e[K"
                else
                        printf "\e[u\e[K"
                fi
        done
        if [ "${answer^}" == "Y" ]; then
                return 0
        fi
        return 1
}

for (( i = 100, max = 110; i <= max; i++ )) ; do
        printf " %d\n" $i
        if [ $i -eq $max ] ; then
                if askYesOrNo "Do you wish to continue?" ; then
                        (( max += 10 ))
                fi
        fi
done

Could be condensed a bit but this is easier to read.
It works here. Does it work on your system?
 

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LEARN ABOUT PHP

libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

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