Write the contents of the file, if it has been modified, on each :next, :rewind, :last, :first, :previous, :stop, :suspend, :tag, :!, :make, CTRL-] and CTRL-^ command; and when a :buffer, CTRL-O, CTRL-I, '{A-Z0-9}, or `{A-Z0-9} command takes one to another file. A buffer is not written if it becomes hidden, e.g. when 'bufhidden' is set to "hide" and :next is used. Note that for some commands the 'autowrite' option is not used, see 'autowriteall' for that. Some buffers will not be written, specifically when 'buftype' is "nowrite", "nofile", "terminal" or "prompt".

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