Outdated math commands in section 2.3. Expressions about book HOT 2 CLOSED

Thanks for raising this issue, this is indeed a recent change and we did not update the book :(
It would be great if you can make a PR, there are several ? commands that were not updated to the new %.

Since | is a special character within the rizin shell (similar to shell, it is used to pipe the output of a command to another one), you need to either escape it or wrap the arguments in quotes.

This is a difference between rizin and r2, as r2 requires you to wrap the whole command, but rizin just requires you to wrap the argument (similarly to how it's done in most/all shells).

So:

[0x00000000]> % 1\|6
[0x00000000]> % "1|6"
[0x00000000]> % '1|6'

All work.

from book.

Ah, perfect. When I read that part of the book, I was wondering why weren't the arguments quoted instead of the whole command. I will check if other parts of the book have the old ? command and make the PR.

from book.