Ditto for comments from other respondents regarding you not specifying _how_ you want it sorted.

However, for "natural" sorting (assuming that's what you want), I quite like Sort::Naturally's nsort function. It sorts things.... well, naturally :)

#!/usr/bin/perl
use strict;
use warnings;
use Sort::Naturally;

my @articleid=qw(b1 b2 b3 a100 a5 a8 a10 a11);

print join("\n", nsort @articleid);
[download]

Gives...

a5
a8
a10
a11
a100
b1
b2
[download]

Cheers,
Darren