Vim: how to convert file name to path? -

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In the script, if I have a file name, how to get it? For example, I want to get a path to the use of the temporary directory Vime. I can get a name for the temporary file by calling Tempname (), but what is the way to remove path by name?

To remove the final path component: 

  fnamemodify (tempname) (), ": H")

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