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Thread: File types

  1. January 6th, 2009 #1
    sharpdust
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    File types

    How does the OS determine what kind of file a particular file is?

    For example, I have two java files.

    The first outputted this:
    file TumbleItem.java
    TumbleItem.java: Perl5 module source text

    The second outputted this:
    file ProxyServer.java
    ProxyServer.java: ASCII C program text

    Both really don't make sense, but how did the OS make that determination. Also, it possible to manually set the file type?
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  2. January 6th, 2009 #2
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    bukwirm
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    Re: File types

    Magic numbers, of course.
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  3. January 8th, 2009 #3
    sharpdust
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    Re: File types

    So is there a way to change this?
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