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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 LINUX

gai.conf

GAI.CONF(5)						     Linux Programmer's Manual						       GAI.CONF(5)

NAME

       gai.conf - getaddrinfo(3) configuration file

DESCRIPTION

       A  call	to  getaddrinfo(3)  might return multiple answers.  According to RFC 3484 these answers must be sorted so that the answer with the
       highest success rate is first in the list.  The RFC provides an algorithm for the sorting.  The	static	rules  are  not  always  adequate,
       though.	 For  this reason, the RFC also requires that system administrators should have the possibility to dynamically change the sorting.
       For the glibc implementation, this can be achieved with the /etc/gai.conf file.

       Each line in the configuration file consists of a keyword and its parameters.  White spaces in any place are ignored.  Lines starting  with
       '#' are comments and are ignored.

       The keywords currently recognized are:

       label netmask precedence
	      The  value  is added to the label table used in the RFC 3484 sorting.  If any label definition is present in the configuration file,
	      the default table is not used.  All the label definitions of the default table which are to be maintained  have  to  be  duplicated.
	      Following the keyword, the line has to contain a network mask and a precedence value.

       precedence netmask precedence
	      This  keyword is similar to label, but instead the value is added to the precedence table as specified in RFC 3484.  Once again, the
	      presence of a single precedence line in the configuration file causes the default table to not be used.

       reload <yes|no>
	      This keyword controls whether a process checks whether the configuration file has been changed since the last time it was read.	If
	      the  value  is "yes", the file is reread.  This might cause problems in multithreaded applications and is generally a bad idea.  The
	      default is "no".

       scopev4 mask value
	      Add another rule to the RFC 3484 scope table for IPv4 address.  By default, the scope IDs described in section 3.2 in  RFC 3438  are
	      used.  Changing these defaults should hardly ever be necessary.

FILES

       /etc/gai.conf

VERSIONS

       The gai.conf file is supported by glibc since version 2.5.

EXAMPLE

       The default table according to RFC 3484 would be specified with the following configuration file:

	   label  ::1/128	0
	   label  ::/0		1
	   label  2002::/16	2
	   label ::/96		3
	   label ::ffff:0:0/96	4
	   precedence  ::1/128	     50
	   precedence  ::/0	     40
	   precedence  2002::/16     30
	   precedence ::/96	     20
	   precedence ::ffff:0:0/96  10

SEE ALSO

       getaddrinfo(3), RFC 3484

Linux								    2016-03-15							       GAI.CONF(5)
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