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Full Discussion: Require input in bash dialog box
Top Forums Shell Programming and Scripting Require input in bash dialog box Post 302994071 by drysdalk on Saturday 18th of March 2017 11:30:04 AM
Old 03-18-2017
EDIT: First version didn't do the input loop, sorry - fixed now.

----------
Hi,

Would something like this do the trick for you ?

Code:
#!/bin/bash
validinput=0

while [ "$validinput" != "1" ]
do
        echo "Please enter an RFC number"
        read rfcnumber

        case $rfcnumber in
                "")
                        echo Either type in your RFC number, or enter N/A if one is unavailable.
                        ;;
                N/A)
                        echo You have indicated an RFC number is not available.
                        validinput=1
                        ;;
                *)
                        if echo "$rfcnumber" | /bin/grep -E "^[0-9]{5,}$" >/dev/null 2>/dev/null
                        then
                                echo Valid RFC number entered.
                                validinput=1
                        else
                                echo "Invalid RFC number entered"
                                echo "Please enter a minimum of five digits only, or N/A if you don't have one"
                        fi
                        ;;
        esac
done

echo "You provided the following valid input:"
echo $rfcnumber

(You could keep using dialog here, I just used the builtin read for my own convenience when writing this).

Here's a sample session, showing it ony accepting input that conists of solely digits, and a minimum of five of them. It will keep prompting the user to enter an RFC until a valid one is provided.

Code:
$ ./script.sh
Please enter an RFC number

Either type in your RFC number, or enter N/A if one is unavailable.
Please enter an RFC number
N/A
You have indicated an RFC number is not available.
You provided the following valid input:
N/A
$ ./script.sh
Please enter an RFC number
123
Invalid RFC number entered
Please enter a minimum of five digits only, or N/A if you don't have one
Please enter an RFC number
ABC
Invalid RFC number entered
Please enter a minimum of five digits only, or N/A if you don't have one
Please enter an RFC number
a12345
Invalid RFC number entered
Please enter a minimum of five digits only, or N/A if you don't have one
Please enter an RFC number
12345a
Invalid RFC number entered
Please enter a minimum of five digits only, or N/A if you don't have one
Please enter an RFC number
1234-567
Invalid RFC number entered
Please enter a minimum of five digits only, or N/A if you don't have one
Please enter an RFC number
123456
Valid RFC number entered.
You provided the following valid input:
123456

Hope this helps. If this isn't quite right let me know and I'll see if I can tweak it.
Last edited by drysdalk; 03-18-2017 at 12:37 PM..
 

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LEARN ABOUT REDHAT

tk_dialog

tk_dialog(n)						       Tk Built-In Commands						      tk_dialog(n)

__________________________________________________________________________________________________________________________________________________

NAME

       tk_dialog - Create modal dialog and wait for response

SYNOPSIS

       tk_dialog window title text bitmap default string string ...
_________________________________________________________________

DESCRIPTION

       This procedure is part of the Tk script library.  Its arguments describe a dialog box:

       window Name of top-level window to use for dialog.  Any existing window by this name is destroyed.

       title  Text to appear in the window manager's title bar for the dialog.

       text   Message to appear in the top portion of the dialog box.

       bitmap If  non-empty,  specifies a bitmap to display in the top portion of the dialog, to the left of the text.	If this is an empty string
	      then no bitmap is displayed in the dialog.

       default
	      If this is an integer greater than or equal to zero, then it gives the index of the button that is to be the default button for  the
	      dialog (0 for the leftmost button, and so on).  If less than zero or an empty string then there won't be any default button.

       string There  will  be  one  button  for each of these arguments.  Each string specifies text to display in a button, in order from left to
	      right.

       After creating a dialog box, tk_dialog waits for the user to select one of the buttons either by clicking on the button with the  mouse	or
       by  typing  return  to invoke the default button (if any).  Then it returns the index of the selected button:  0 for the leftmost button, 1
       for the button next to it, and so on.  If the dialog's window is destroyed before the user selects one of the buttons, then -1 is returned.

       While waiting for the user to respond, tk_dialog sets a local grab.  This prevents the user from interacting with the  application  in  any
       way except to invoke the dialog box.

KEYWORDS

       bitmap, dialog, modal

Tk									4.1							      tk_dialog(n)
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