今天又机会尝试了下Ruby的Tempfile库，相比于自己创建临时文件再删除的方法简便了很多。
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require 'tempfile'
tmp = Tempfile.new("tmp")
tmp.path # => /tmp/tmp20110928-12389-8yyc6w 不唯一
tmp.write("This is a tempfile")
tmp.rewind
tmp.read # => "This is a tempfile"
tmp.close
tmp.unlink # => 删除文件
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当程序退出时，Ruby会自动删除临时文件，所以我们不用显式调用unlink来删除文件。但是这是一个好习惯，解释如下：
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When a Tempfile object is garbage collected, or when the Ruby interpreter exits, its associated temporary file is automatically deleted. This means that's it's unnecessary to explicitly delete a Tempfile after use, though it's good practice to do so: not explicitly deleting unused Tempfiles can potentially leave behind large amounts of tempfiles on the filesystem until they're garbage collected. The existance of these temp files can make it harder to determine a new Tempfile filename.?
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