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