Category Pages: How to show more posts

This example uses the WordPress Default theme. Just copy wp-content/default/theme/index.php to wp-content/default/theme/category.php

Then edit that template file and change:

<?php if (have_posts()) : ?>

to

<?php
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
query_posts($query_string . '&showposts=10&paged=' . $paged);
?>
<?php if (have_posts()) : ?>

Oh and change the_content() to the_excerpt() in your category.php template.

Related:
Stepping Into Template Tags
Stepping Into Templates
Template Hierarchy

Thanks. This helped.
I’m using a different template (Revolution Lifestyle), and there was no category.php file, just an archive.php file which controls the category pages.

When I tried copying the index.php to the archive.php, I got an error message, but then I went back and added the code you gave:

<?php
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
query_posts($query_string . '&showposts=10&paged=' . $paged);
?>

to appear before

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

which is what this template shows instead of

<?php if (have_posts()) : ?>

and this corrected the problem.

The WordPress Default Theme does not have a category.php but it is easily created by coping another template to that file name. Of course the Template Hierarchy controls what WordPress uses to ‘process’ your theme.

Is there a way to limit this to only one category page or is it all or nothing?

Thanks in advance!