Get File MIME Type from Command Line

By  on  

I've gotten skilled at shell scripting over the years. I love a good GUI but knowing how to automate makes you a much more powerful engineer. Much of my scripting requires recursing over directories and processing a file if it meets a given criteria, which is often file extension or MIME type.

You can use the following shell command to get a file's MIME type:

file --mime-type -b Downloads/main.js
# text/plain

file --mime-type -b Downloads/logo.jpg
# image/jpeg

It's important to use the brief (-b) option in the command or you may receive an error message.

MIME type is used for validation and any number of other informational use cases. Luckily the file command and and a flag is all you need!

Recent Features

  • By
    Camera and Video Control with HTML5

    Client-side APIs on mobile and desktop devices are quickly providing the same APIs.  Of course our mobile devices got access to some of these APIs first, but those APIs are slowly making their way to the desktop.  One of those APIs is the getUserMedia API...

  • By
    5 HTML5 APIs You Didn’t Know Existed

    When you say or read "HTML5", you half expect exotic dancers and unicorns to walk into the room to the tune of "I'm Sexy and I Know It."  Can you blame us though?  We watched the fundamental APIs stagnate for so long that a basic feature...

Incredible Demos

  • By
    Highlight Table Rows, Columns, and Cells Using MooTools 1.2.3

    Row highlighting and individual cell highlighting in tables is pretty simple in every browser that supports :hover on all elements (basically everything except IE6). Column highlighting is a bit more difficult. Luckily MooTools 1.2.3 makes the process easy. The XHTML A normal table. The cells...

  • By
    Dynamically Load Stylesheets Using MooTools 1.2

    Theming has become a big part of the Web 2.0 revolution. Luckily, so too has a higher regard for semantics and CSS standards. If you build your pages using good XHTML code, changing a CSS file can make your website look completely different.

Discussion

    Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!