Linux Basics (2024-03-11 - 2024-03-13)

• Start: Monday 2024-03-11, 8:00AM

• Original agenda: Agenda: Linux Basics (2024-03-11 - 2024-03-13)

• Material taken from Linux Basics

Day 1

SSH/Putty Setup

From SSH: Secure Shell

• SSH: Basics

• SSH: Public Key Authentication

Exercise

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

Introduction: Concepts and Terminology

From Introduction: Concepts and Terminology

• Overview

• Processes, Scheduling, Address Spaces

• Process Hierarchy (Parent, Child Process)

• Everything Is A File (Live Demo)

• Environment (Variables)

The Shell (Bash - “Bourne Again Shell”)

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

• Absolute and Relative Paths

• Directory Listings: The ls Command

• Current Working Directory

• Creating And Removing Files and Directories

• Copying: cp

• Moving and Renaming: mv

Exercises

From Exercises: Create/Copy/Move/Remove

• Exercise: mkdir

• Exercise: Create Files (I/O Redirection)

• Exercise: Copy Files

• Exercise: Move Files

• Exercise: Verify, Repeat

• Exercise: Copy Directory Tree

• Exercise: Remove Directory Tree

• Exercise: Funny Stuff

Day 2

Morning Wakeup

Quiz 🥷

Relative paths start with a ‘/’
Relative paths don’t start with a ‘/’
Absolute paths start with a ‘/’
Absolute paths don’t start with a ‘/’
Absolute paths are relative to the root directory
‘.’ refers to the currect working directory
‘..’ refers to the currect working directory of the parent process

Exercises

From Exercises: The ls Command

• Exercise: Size of /etc/passwd

• Exercise: File Types in /dev

• Exercise: Permissions of Home Directory

File System Permissions

From File System Permissions

• Permissions: Mode, User and Group Ownership

• Exercises: File System Permissions

  • Exercise: Determine Your User Credentials

  • Exercise: Create Group-Shared File

  • Exercise: Create Private Directory

  • Question: Private Directory

  • Exercise: Create Public Directory

  • Question: Public Directory

  • FH/Moodle Quiz: Permissions

• SetUID Programs: passwd, sudo, …

• SetUID: Live Demo

• Default Permissions: umask

• Ugly Hack: Sticky Bit

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

• Shell Configuration File: ~/.bashrc

• Symbolic Links, Hard Links

Day 3

Morning Wakeup

• What does / contain? ⟶ File system hierarchy overview (systemd)

• Emacs/Bash keyboard shortcuts (Google knows). E.g.

  • /trainings/material/soup/linux/basics/shell/bash-help-sheet.pdf

  • /trainings/material/soup/linux/basics/shell/readline-emacs-editing-mode-cheat-sheet.pdf

• WSL walk-through ⟶ Windows Subsystem for Linux (WSL)

• Services?

  • systemd: System and Service Manager

  • … as opposed to SysVinit

Missing Pieces

From Introduction: Concepts and Terminology

• Environment (Variables)

From SSH: Secure Shell

• SSH File System (sshfs)

Tools: Inspecting Text Files

From Tools: Inspecting Text Files

• Overview

• cat

• head And tail

• cut

• less

• grep

• find

• Exercises: Inspecting Text Files

I/O Redirection And Pipes

From I/O Redirection And Pipes

• I/O Redirection

• Pipes

• Exercises: IO-Redirection, Pipes

Archiving and Compression

From Archiving and Compression

• Archiving and Compression

• gzip

• tar

• Exercises: Archiving And Compression