Magic isn't 100% anyway. It's best to use extensions unless you're doing
forensics.


On Thu, Aug 29, 2013 at 10:59 PM, Phil Pennock <
zsh-workers+phil.pennock@spodhuis.org> wrote:

> On 2013-08-30 at 09:12 +0800, vinurs wrote:
> > then in zsh, I can open pdf files, but ,when I mv test.pdf to
> test.pdf.bk,
> > It can not be opened.
> > I use file --mime-type test.pdf.bk, It shows:
> > test.pdf.bk: application/pdf
>
> The `file` command looks inside the content of a file and uses a complex
> set of rules to try to figure out what sort of file it is.
>
> The normal approach of MIME handling on Unix is to use the filename
> extension to figure out the type of file.  There are *two* files of
> interest: `mailcap` files say what to do with a MIME type, `mime.types`
> files say what MIME type should be assumed for a given extension.
>
> The pathnames to these files and other information can be found in the
> zshcontrib(1) manual-page:
>
>     % man zshcontrib
>
> and search for "MIME FUNCTIONS".
>
> -Phil
>