jekyll/site/_posts/2012-07-01-variables.md

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Jekyll traverses your site looking for files to process. Any files with YAML Front Matter are subject to processing. For each of these files, Jekyll makes a variety of data available to the pages via the Liquid templating system. The following is a reference of the available data.

Global Variables

Variable	Description
site	Sitewide information + Configuration settings from _config.yml
page	This is just the YAML Front Matter with 2 additions: url and content.
content	In layout files, this contains the content of the subview(s). This is the variable used to insert the rendered content into the layout. This is not used in post files or page files.
paginator	When the paginate configuration option is set, this variable becomes available for use.

Site Variables

Variable	Description
site.time	The current time (when you run the jekyll command).
site.posts	A reverse chronological list of all Posts.
site.related_posts	If the page being processed is a Post, this contains a list of up to ten related Posts. By default, these are low quality but fast to compute. For high quality but slow to compute results, run the jekyll command with the --lsi (latent semantic indexing) option.
site.categories.CATEGORY	The list of all Posts in category CATEGORY.
site.tags.TAG	The list of all Posts with tag TAG.
site.[CONFIGURATION_DATA]	All variables set in your _config.yml are available through the site variable. For example, if you have url: http://mysite.com in your configuration file, then in your posts and pages it can be accessed using {{ "{{ site.url " }}}}. Jekyll does not parse changes to _config.yml in auto mode, you have to restart Jekyll to see changes to variables.

Page Variables

Variable	Description
page.content	The un-rendered content of the Page.
page.title	The title of the Post.
page.url	The URL of the Post without the domain. e.g. /2008/12/14/my-post.html
page.date	The Date assigned to the Post. This can be overridden in a post’s front matter by specifying a new date/time in the format YYYY-MM-DD HH:MM:SS
page.id	An identifier unique to the Post (useful in RSS feeds). e.g. /2008/12/14/my-post
page.categories	The list of categories to which this post belongs. Categories are derived from the directory structure above the _posts directory. For example, a post at /work/code/_posts/2008-12-24-closures.textile would have this field set to ['work', 'code']. These can also be specified in the YAML Front Matter.
page.tags	The list of tags to which this post belongs. These can be specified in the YAML Front Matter

ProTip™: Use custom front-matter

Any custom front matter that you specify will be available under page. For example, if you specify custom_css: true in a page’s front matter, that value will be available in templates as page.custom_css.

Paginator

Variable	Description
paginator.per_page	Number of posts per page.
paginator.posts	Posts available for that page.
paginator.total_posts	Total number of posts.
paginator.total_pages	Total number of pages.
paginator.page	The number of the current page.
paginator.previous_page	The number of the previous page.
paginator.next_page	The number of the next page.

Paginator variable availability

These are only available in index files, however they can be located in a subdirectory, such as /blog/index.html.