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Top Forums UNIX for Dummies Questions & Answers to check if a string has only digits Post 302096438 by Andrek on Wednesday 15th of November 2006 04:24:25 PM
Old 11-15-2006
Try this

#!/bin/sh
if [ -z "`echo \"$1\" | tr -d \"[:alnum:]\"`" ]
then
echo "True - only alpha and numeric"
else
echo "False - there are NON alpha and numeric stuff here!"
fi
 

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CheckDigits::M23_002(3pm)				User Contributed Perl Documentation				 CheckDigits::M23_002(3pm)

NAME
CheckDigits::M23_002 - compute check digits for VAT Registration Number (IE) SYNOPSIS
use Algorithm::CheckDigits; $dni = CheckDigits('ustid_ie'); if ($dni->is_valid('8473625E')) { # do something } $cn = $dni->complete('8473625'); # $cn = '8473625E' $cd = $dni->checkdigit('8473625E'); # $cd = 'E' $bn = $dni->basenumber('8473625E'); # $bn = '8473625' DESCRIPTION
ALGORITHM 1. Beginning right all digits are weighted with their position in the number (i.e. the number left from the check digit is multiplied with 2, the next with 3 and so on). 2. All products are added. 3. The check digit is the sum from step 2 modulo 23. This number is expressed as the corresponding letter from the alphabet where A-V correspond to 1-22 and W stands for check digit 0. METHODS is_valid($number) Returns true only if $number consists solely of numbers and the last digit is a valid check digit according to the algorithm given above. Returns false otherwise, complete($number) The check digit for $number is computed and concatenated to the end of $number. Returns the complete number with check digit or '' if $number does not consist solely of digits and spaces. basenumber($number) Returns the basenumber of $number if $number has a valid check digit. Return '' otherwise. checkdigit($number) Returns the checkdigit of $number if $number has a valid check digit. Return '' otherwise. EXPORT None by default. AUTHOR
Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de> SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de. perl v5.10.0 2008-05-17 CheckDigits::M23_002(3pm)
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