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Add doc of @filename in intro_patterns.rst
I noticed that the @filename notation for the --limit argument was not conveniently described. This patch adds a simple example to the intro_patterns.rst file.
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@ -84,6 +84,10 @@ While we're jumping a bit ahead, additionally, you can add an exclusion criteria
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ansible-playbook site.yml --limit datacenter2
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And if you want to read the list of hosts from a file, prefix the file name with '@'. Since Ansible 1.2::
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ansible-playbook site.yml --limit @retry_hosts.txt
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Easy enough. See :doc:`intro_adhoc` and then :doc:`playbooks` for how to apply this knowledge.
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.. seealso::
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