11-26-2009
the wait() system call returns the lowest 8 bits of the actual return code.
It is treated as if it were an "unsigned char" in effect. It is not. So, negative small numbers returned become return values > 127, for example. Think ~(return value), we saw this on migrating from 11.0 to HPUX 11.23 PA_RISC-2 boxes, running 32 bit mode code. The 11.0 code is binary compatible, so we did not recompile.
Create a hashed alias in /etc/profile: a shell script wrapper for logins. It masks the return value to zero or 1. We ran into other commands that do this as well.
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LEARN ABOUT DEBIAN
algorithm::checkdigits::m11_017
CheckDigits::M11_017(3pm) User Contributed Perl Documentation CheckDigits::M11_017(3pm)
NAME
CheckDigits::M11_017 - compute check digits for EC-No, EINECS, ELINCS
SYNOPSIS
use Algorithm::CheckDigits;
$ecno = CheckDigits('ecno');
if ($ecno->is_valid('200-236-6')) {
# do something
}
$cn = $ecno->complete('200-236-');
# $cn = '200-236-6'
$cd = $ecno->checkdigit('200-236-6');
# $cd = '6'
$bn = $ecno->basenumber('200-236-6');
# $bn = '200-236-'
DESCRIPTION
ALGORITHM
1. From left to right all digits are multiplied with their position in the sequence.
2. The sum of all products is computed.
3. The sum of step 2 is taken modulo 11.
The checkdigit is the last digit of the result.
METHODS
is_valid($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, http://en.wikipedia.org/wiki/EC-No.
perl v5.10.0 2008-05-17 CheckDigits::M11_017(3pm)