with our tiny.magic.wands

Unix Magic

Unix Detour - Abstraction USER-land vs KERNAL-land

Unix Detour - Abstraction USER-land vs KERNAL-land contd.

Unix Detour - AbstractionSignals/System calls

JUST LIKE AN API

SIGNALS + SYSCALLS

Unix Detour - AbstractionsExecution Existence aka Process

INIT is the mother of all

Unix Detour - Abstractions Everything is a file

Biggest abstraction pulled over your eyes by the unix

The trick is to provide a common abstraction for all of these resources, each of which the UNIX fathers called a “file”. Since every “file” is exposed through the same API1, you can use the same set of basic commands to read/write to a disk, keyboard, document or network device.

2 key takeaways:

In UNIX everything is a stream of bytesIn UNIX the filesystem is used as a universal name space

DEMO

Toolchain Get your hands dirty

Process Monitoring

HTOP TOP WATCH

Log Monitoring

TAIL LESS GREP

Terminal multiplexing

SCREEN

Implementation in our EC2