Linux and Shell Programming

author	Matt Harasymczuk
email	book@astronaut.center
www	https://www.astronaut.center
github	https://github.com/astromatt
linkedin	https://linkedin.com/in/mattharasymczuk
facebook	https://facebook.com/matt.harasymczuk
slideshare	https://www.slideshare.net/astrotech/presentations

Tip

• This book is free and open source at https://dev.astrotech.io

• For consulting or training course requests please email book@astronaut.center

Table 3. Other books from author

ISBN	URL	Title
978-83-957186-2-5	https://python.astrotech.io	Python 3: from None to Machine Learning
978-83-957186-3-2	https://dev.astrotech.io	The Software Engineering: DevOps, CI/CD, Docker, Provisioning and Git Flow
978-83-957186-0-1	https://www.astronaut.pl	Astronaut Selection and Training for Long Duration Spaceflight and Extraterrestrial Activity
978-83-956752-0-1	https://www.astronaut.center/books	Space in Practice: How to Prepare and Conduct Stratospheric Balloon Mission
978-83-957186-4-9	https://pl.habitatos.space	HabitatOS - Development of operating system prototype for Lunar and Martian habitats
978-83-957186-1-8	https://alsep.astronaut.center	Geophysics experiments from Apollo Lunar Surface Experiments Package

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

About

About

• 1. Agenda
• 2. VIM
  • 2.1. Opening Files
  • 2.2. Edit/Command Mode
  • 2.3. Writing and Quit

Linux

Linux

• 1. Linux Distributions
  • 1.1. Alpine
  • 1.2. Debian
  • 1.3. Ubuntu
• 2. Manuals
  • 2.1. Commands
  • 2.2. References
• 3. Directory Structure
  • 3.1. Directory Structure
  • 3.2. Root Directory
• 4. Files and Directories
  • 4.1. Change Directory
  • 4.2. List Files and Directories
  • 4.3. Files
  • 4.4. Directories
  • 4.5. Files and Directories
• 5. Permissions
  • 5.1. Understanding Permissions
  • 5.2. Changing Permissions
  • 5.3. UMASK
  • 5.4. Sticky bit
  • 5.5. ACL
• 6. Packages
  • 6.1. Paths
  • 6.2. Commands
• 7. Environment Variables
  • 7.1. Paths
  • 7.2. Variables
  • 7.3. PS1
  • 7.4. Commands
• 8. Users and groups
  • 8.1. Paths
  • 8.2. Etc Passwd
  • 8.3. Etc Shadow
  • 8.4. Etc Group
  • 8.5. useradd vs. adduser
  • 8.6. Commands
• 9. Shell
  • 9.1. Shells
  • 9.2. Paths
  • 9.3. Keyboard Shortcuts
  • 9.4. Debugging
  • 9.5. Commands
• 10. Crontab
  • 10.1. Files
  • 10.2. Directories
  • 10.3. Output Redirect
  • 10.4. Commands
  • 10.5. Variables
  • 10.6. Syntax
  • 10.7. Time
  • 10.8. Recurrence
  • 10.9. Example
  • 10.10. Use Case - 0x01
  • 10.11. Use Case - 0x02
  • 10.12. Use Case - 0x03
  • 10.13. Use Case - 0x04
• 11. Logs
  • 11.1. Files
  • 11.2. Commands
• 12. Security
  • 12.1. Random
  • 12.2. /dev/random vs /dev/urandom
  • 12.3. Commands
  • 12.4. References
• 13. SSH
  • 13.1. Generate Key
  • 13.2. Connect
  • 13.3. Authorized Keys
  • 13.4. Known Hosts
  • 13.5. Port Forwarding
  • 13.6. Config and Host Aliases
  • 13.7. SSHd
• 14. Locale
  • 14.1. Paths
  • 14.2. Variables
  • 14.3. Commands
• 15. Date
  • 15.1. Paths
  • 15.2. Date Formatting
  • 15.3. Date
  • 15.4. Unix Timestamp
  • 15.5. Commands
• 16. Filesystem
  • 16.1. Disk
  • 16.2. Partitioning
  • 16.3. File Systems
  • 16.4. Integrity
  • 16.5. Mounting
• 17. Processes
  • 17.1. PID
  • 17.2. Problems
  • 17.3. Killing
  • 17.4. Keyboard Shortcuts
  • 17.5. Priorities
  • 17.6. Commands
• 18. Signals
• 19. Boot
  • 19.1. Modes
  • 19.2. GRUB
  • 19.3. Files
  • 19.4. Directories
  • 19.5. Commands
• 20. Services
  • 20.1. Runlevel
  • 20.2. Initialization
  • 20.3. Configuration
  • 20.4. Management
  • 20.5. Commands
• 21. Networking
  • 21.1. IPv4 vs IPv6
  • 21.2. Networks
  • 21.3. Paths
  • 21.4. Built-in
  • 21.5. Additional
• 22. Devices
  • 22.1. Files
  • 22.2. Directories
  • 22.3. Devices
  • 22.4. Commands
• 23. Kernel
  • 23.1. Commands
• 24. X Window System
  • 24.1. Paths
  • 24.2. Desktop Manager
  • 24.3. Desktop Environment
  • 24.4. Commands
• 25. Compression
  • 25.1. Commands
• 26. Backup

Shell Programming

Shell Programming

• 1. About
  • 1.1. Variables
  • 1.2. Symbols
  • 1.3. Control Flow
  • 1.4. Commands
• 2. Interpreter
  • 2.1. Configuration files
  • 2.2. Locale
  • 2.3. Autocompletion
  • 2.4. New lines
  • 2.5. #!/bin/bash
  • 2.6. bash -x
  • 2.7. Comments
  • 2.8. Inline comments
• 3. Variables
  • 3.1. single quotes
  • 3.2. double quotes
  • 3.3. Script arguments
• 4. Conditionals
  • 4.1. if
  • 4.2. if and else
  • 4.3. Short version - && and ||
  • 4.4. Case (A.K.A. switch)
• 5. Loops
  • 5.1. For
  • 5.2. While
  • 5.3. Until
• 6. Redirection Commands
  • 6.1. Descriptors
  • 6.2. Redirection
  • 6.3. References
• 7. Pipe
  • 7.1. Pipe - |
  • 7.2. awk
  • 7.3. sed
  • 7.4. sort
  • 7.5. uniq
• 8. Stdout and Stderr
• 9. > and >>
• 10. < and <<
• 11. 1 > /dev/null
• 12. 2 > &1
• 13. Arrays
  • 13.1. Declaration
  • 13.2. Storing values
  • 13.3. Getting values
  • 13.4. Metadata
  • 13.5. Destruction
• 14. Network
  • 14.1. wget
  • 14.2. curl
• 15. Parameter expansion
  • 15.1. Simple usage
  • 15.2. Indirection
  • 15.3. Case modification
  • 15.4. Variable name expansion
  • 15.5. Substring removal (also for filename manipulation!)
  • 15.6. Search and replace
  • 15.7. String length
  • 15.8. Substring expansion
  • 15.9. Use a default value
  • 15.10. Assign a default value
  • 15.11. Use an alternate value
  • 15.12. Display error if null or unset
• 16. Regular Expressions
  • 16.1. Grep
  • 16.2. Egrep
• 17. Multiprocessing
  • 17.1. Process - ...&
  • 17.2. Subprocess - $(...)
  • 17.3. Return codes from last command $?

Summary

Summary

• 1. Commands
• 2. Shell Scripting