Linux Basics (2023-05-23 - 2023-05-25)

• Start: Tuesday, 8:30

• Linux Basics

• Original agenda: Agenda: Linux Basics (2023-05-23 - 2023-05-25)

Day 1

Setup

Please create SSH key as described here, and send me the public key.

SSH: Basics

Introduction: Concepts and Terminology

From Introduction: Concepts and Terminology

• Overview

• Everything Is A File (Live Demo)

• Processes, Scheduling, Address Spaces

• Process Hierarchy (Parent, Child Process)

• Environment (Variables)

The Shell (Bash - “Bourne Again Shell”)

From The Shell (Bash - “Bourne Again Shell”)

• Absolute and Relative Paths

• Special Paths

• Directory Listings: The ls Command

• Current Working Directory

• Creating And Removing Files and Directories

Day 2

The Shell (Bash - “Bourne Again Shell”)

From The Shell (Bash - “Bourne Again Shell”)

• Copying: cp

• Moving and Renaming: mv

• Symbolic Links, Hard Links

• Shell Configuration File: ~/.bashrc

Exercise time (from The Shell - Exercises)

• Exercises: Create/Copy/Move/Remove

Tools: Inspecting Text Files

From Tools: Inspecting Text Files

• Overview

• cat

• head And tail

• cut

• less

• grep

• find

• Exercises: Inspecting Text Files

File System Permissions

From File System Permissions

• Permissions: Mode, User and Group Ownership

• Exercises: File System Permissions

Day 3

Morning Wakeup

• Package installation

  • bash from source

    • Clone from Github

    • Build (read INSTALL)

    • Install (make && make install)

  • coreutils from source

    • Clone from Github

    • Build ⟶ build-time dependencies fail (wtf is autopoint?)

  • The problems that are solved by package management systems such as Debian (.deb) and Redhat (.rpm)

  • Dependency management

  • And Flatpak?

• File locking? (man -s 2 fcntl)

File System Permissions

More from File System Permissions

• SetUID Programs: passwd, sudo, …

• SetUID: Live Demo

• Default Permissions: umask

• Ugly Hack: Sticky Bit

I/O Redirection And Pipes

From I/O Redirection And Pipes

• I/O Redirection

• I/O Redirection: Swap stdout And stderr

• Pipes

• Exercises: IO-Redirection, Pipes

Archiving and Compression

From Archiving and Compression

• Archiving and Compression

• gzip

• tar

• Exercises: Archiving And Compression

Networking

From Linux Basics PDF

• netstat

• Netcat (nc)

Processes And Scheduling

From Linux Basics PDF

SSH: Secure Shell

From SSH: Secure Shell

• SSH: Basics

• SSH: Public Key Authentication

• SSH: Secure Copy (scp)

• SSH: Port Forwarding

• SSH File System (sshfs)

• SSH: Links

• Exercises: SSH

Shell Scripting (at least some of it)

From Shell Scripting PDF