update the index

GenomicsAotearoa · Jul 30, 2024 · 527810b · 527810b
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 | **Lesson**                                         | **Overview** | 
 |:---------------------------------------------------|:-------------|
+|Pre . [Unix, Linux and UNIX Shell](./0-unixl-linux-overview.md)|Quick overview on UNIX operating system and it's importance|
 |1. [Introducing the shell](./01-introduction.md)| Introduce `cd` `ls`  |
 |2. [Navigating files and directories](./02-the-filesystem.md)| moving around the filesystem. Introduce absolute vs relative path |
 |3. [Working with files and directories](./03-working-with-files.md)| View, search within, copy, move, and rename files. Create new directories |