[SOLVED] Control characters in Shell mode (left, right, up and down arrow keys)

jags1984 · 04-02-2013, 06:49 AM

Thanks

Code:

read -re -p "some_text" ch

This i tried but when the user edits the whole word that he enetered and comes to the first character and presses left arrow key it starts moving to the left most part and over writes the screen display.

Kenhelm · 04-02-2013, 09:39 PM

I can't reproduce your problem; adding '-p "some_text"' cured the overwriting on my system.
I tested it on Mageia2 with Bash 4.2.37 on these terminals :-
konsole
mrxvt
xterm
virtual console (obtained with Ctrl+Alt+function key)

This is the script used for the test

Code:

#!/bin/bash
tput cup 2 20
read -re -p "1.Name :" ch
echo "$ch"

jags1984 · 04-02-2013, 11:34 PM

Code:

#!/bin/bash
clear
tput cup 2 20
read -re -p "1.Name :" ch
echo "$ch"

Type some text on the screen say "Apple" now move the left arrow key to character 'A' and start typing some other word say "Ball" now again u press the left arrow key on Character 'B' and satrting editing it the cursor will move to the leftmost postion.Keep u r left arrow key pressing while modifying.

My screen looks something like this

cballAppleame :cccccballApple

Kenhelm · 04-03-2013, 09:28 PM

I still can't reproduce your problem though I've found two other ways of getting the code to fail on my system.
1. If a letter key is rapidly alternated about a dozen times with the left arrow key.
2. If a long string is typed in which wraps onto the line below and then the backspace key is used to delete it.

Both problems disappear if read is positioned at column 0. It seems read -e does not work very well when used in the middle of a line.

Perhaps you should try changing your three line display into a six line display:-
1.Name :
Some name
2.Address :
Some address
3.Phone :
Some number

It still won't be a foolproof way of entering text because if someone types in a very long name it will wrap onto the line below and overwrite the '2.Address :' prompt.
Using something like Xdialog, Zenity or Kdialog could give better results.
Xdialog has a --3inputsbox option for entering three fields of texts.
http://xdialog.free.fr/doc/box.html

jags1984 · 04-03-2013, 11:19 PM

Thanks for answering my questions.

Looks like i have redesign everything now.

Thankyou