Use drush with the devel module to generate content, limiting to a specific node type with the --types option:
drush generate-content 10 --types=page
As always, --help shows the options:
[khodsden@sportsvideohub html]$ drush generate-content --help
Create content.
Arguments:
number_nodes Number of nodes to generate.
maximum_comments Maximum number of comments to generate.
Options:
--feedback An integer representing interval for insertion rate logging. Defaults to 500
--kill Delete all content before generating new content.
--languages A comma-separated list of language codes
--skip-fields A comma delimited list of fields to omit when generating random values
--types A comma delimited list of content types to create. Defaults to page,article.
Aliases: genc