Slight error with my perl script that I could use some help on Post: 302997210

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Top Forums Shell Programming and Scripting Slight error with my perl script that I could use some help on Post 302997210 by Eric1 on Tuesday 9th of May 2017 07:59:28 PM

05-09-2017

Registered User

Slight error with my perl script that I could use some help on

So I have a perl script that prompts the user to enter either q or Q to exit the program or c to continue said program. If the user inputs anything other than those three keys they will be prompted again and again for an appropriate input. My script works for the most part except for one small oddity. Here's an example- if the user inputs a, they will be prompted again. They input a again, they are prompted once more. They input q and the program exits. Works fine right? I run my script again and I change my inputs a little. This time I input a first, the user is prompted again. Now I input q, but the program doesn't exit, it prompts me yet again. If I input q now, it will exit. This oddity also occurs if it's Q or c as well instead of q. This is the oddity I want to fix, can anyone help? Here is the bulk of my code that deals with this small problem-

Code:

print "Welcome to an interactive Perl program. Enter either q or Q to terminate the program or c to continue. Enter your key now: ";
my $input;
$input = <STDIN>;
chomp $input;
if (($input ne "q") && ($input ne "Q") && ($input ne "c"))
        {
                print "Welcome to an interactive Perl program. Enter either q or Q to terminate the program or c to continue. Enter your key now: ";
                $input = <STDIN>;
                chomp $input;
        }
elsif (($input eq "q") || ($input eq "Q"))
        {
                exit;
        }
else
        {

the parts after else aren't important, as I've tested them and they work fine. It's only the small oddity that I described above that I need assistance with

Last edited by jim mcnamara; 05-09-2017 at 09:03 PM.. Reason: code tag correction

Eric1

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shasum

SHASUM(1)						 Perl Programmers Reference Guide						 SHASUM(1)

NAME

       shasum - Print or Check SHA Checksums

SYNOPSIS

	Usage: shasum [OPTION] [FILE]...
	   or: shasum [OPTION] --check [FILE]
	Print or check SHA checksums.
	With no FILE, or when FILE is -, read standard input.

	 -a, --algorithm    1 (default), 224, 256, 384, 512
	 -b, --binary	    read files in binary mode (default on DOS/Windows)
	 -c, --check	    check SHA sums against given list
	 -p, --portable     read files in portable mode
				produces same digest on Windows/Unix/Mac
	 -t, --text	    read files in text mode (default)

	The following two options are useful only when verifying checksums:

	 -s, --status	    don't output anything, status code shows success
	 -w, --warn	    warn about improperly formatted SHA checksum lines

	 -h, --help	    display this help and exit
	 -v, --version	    output version information and exit

	The sums are computed as described in FIPS PUB 180-2.  When checking,
	the input should be a former output of this program.  The default mode
	is to print a line with checksum, a character indicating type (`*'
	for binary, `?' for portable, ` ' for text), and name for each FILE.

DESCRIPTION

       The shasum script provides the easiest and most convenient way to compute SHA message digests.  Rather than writing a program, the user
       simply feeds data to the script via the command line, and waits for the results to be printed on standard output.  Data can be fed to
       shasum through files, standard input, or both.

       The following command shows how easy it is to compute digests for typical inputs such as the NIST test vector "abc":

	       perl -e "print qw(abc)" | shasum

       Or, if you want to use SHA-256 instead of the default SHA-1, simply say:

	       perl -e "print qw(abc)" | shasum -a 256

       Since shasum uses the same interface employed by the familiar sha1sum program (and its somewhat outmoded anscestor md5sum), you can install
       this script as a convenient drop-in replacement.

AUTHOR

       Copyright (c) 2003-2008 Mark Shelor <mshelor@cpan.org>.

SEE ALSO

       shasum is implemented using the Perl module Digest::SHA or Digest::SHA::PurePerl.

perl v5.12.4							    2013-03-18								 SHASUM(1)