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Magic words are strings of text that MediaWiki associates with a return value or function, such as time, site details, or page names. This page is about usage of standard magic words; for a technical reference, see Manual:Magic words.




There are three general types of magic words:



• Behavior switches: these are uppercase words surrounded by double underscores (eg __FOO__)
• Variables: these are uppercase words surrounded by double braces (eg {{FOO}}). As such, they look a lot like templates
• Parser functions: these take parameters and are either of the form {{foo:...}} or {{#foo:...}}.



Page-dependent magic words will affect or return data about the current page, even if the word is added through a transcluded template or included system message.

Another possibility is to create a brand new memory device. We can do this with the filesystem type: tmpfs. Let's say you want to create a tmpfs instance on /var/www/www.mysite.com/ramdrive that can allocate a max of 500MB RAM and that can only be changed by root, but accessed by everyone (like Apache):

mkdir -p /var/www/www.mysite.com/ramdrive
mount -t tmpfs -o size=500M,mode=0744 tmpfs /var/www/www.mysite.com/ramdrive