Chapter 3 and 4 were pretty simple, especially with a Unix background
the content can be compared.

Here are a couple of notes I took during my reading.

## Chapter 3

They fixed the create syscall 😂

Quote:> Plan 9 does not have a wastebasket

First time I hear it called that way.

In Plan9, like old Unix, you can still see the directory file structure
and manipulate it directly with the help of some specific syscalls:


Globbing in the shell is the same as Unix.

One thing that is different though are the arguments for the dd command,
they got dashes now.


I was particularly impressed by the buffer section of chapter 3. It's
a pretty good way to learn the importance of buffering. We also get a
practical example. Biobuf is really useful instead of reinventing the
wheel each time.


## Chapter 4

Similar vibe as chapter 3, I keep comparing in my mind.

Fork is the same as Unix fork.

NB: The author never stops the "important" talk.

One thing I found weird is that execl needs argv[0] explicitly, that's
peculiar.

Wait syscall also returns a full message, I like how errors are much
more verbose in Plan9, that makes it simpler to debug.