What's a file?

Directories

A directory looks like this:

        .                    802881
        ..                   673145
        .bak                 802882
        .width-errors        802888
        Flags.slides         802884
        INAMBLE              802885
        MAKE_SLIDES          802886
        blookus              142857
        Makefile             802887
        .slide_names         802890
        POSTAMBLE            802889
        ext2fs.slides        802883
        ...

Each line is called a link. It has a name and an i-number

The actual format of a link varies from version to version of Unix

Originally, each link was just 14 bytes of name followed by 2 bytes of i-number