Cedrus Training: Bash

Project used to facilitate learning bash. Level-up your bashing weapons skills!

Source: Gfycat

Layout

• docker: Dockerfiles for the test playground.
• scripts: Demonstration scripts for the commands presented. Scripts are snippets, not entirely runnable scripts!
• docker-compose.yml: Configuration for the playground.

Getting Started

This project uses Docker containers to create a test environment to play around in.

0. Ensure you have Docker and Docker Compose installed on your system.
1. Run docker-compose build from the top of the project to build the playground.
2. Run docker-compose up -d && docker-compose run ubuntu bash to enter the playground.
3. To stop the running instances, run docker-compose down

Outline

What is Bash

• Bourne Shell (sh)
• POSIX IEEE standard
• Bourne Again SHell (bash)

Why Bash

• Helpful in day-to-day tasks
• Important for understanding your OS
• Application development for containers (LXD, Docker)
• Server administration

Getting Started

• Mac / Linux: Good to Go!
• Windows: Git Bash or WSL (Windows Subsystem Linux)
• Docker: docker pull bash

Level 0: Basic & Builtins

• cat
• cd
• echo (bonus: scripts/progress-bar.sh)
• exit
• export / unset
• find / locate
• help
• history
• less / more / tail
• ls
• man
• mkdir
• mv
• ping
• pwd
• read
• rm
• rmdir
• touch
• type
• whereis
• which

Level 1: Operators & Variables

• Variables
• Parameters
• Arithmetic
• Logical
• IO

Level 2: Control Flow & Functions

• while, for, if/else
• Functions

Level 3: Configuration & Advanced Commands

• alias
• .bashrc / .profile
  • Create aliases for common commands, set up environment variable values
  • Use .bashrc for commands, aliases, and environment vars specific to bash
  • Use .profile for non-bash environment vars, is POSIX compatible, and executed upon login
• diff
• grep
• rsync
• sed
• scp
• ssh
• xargs

The Arena!

What commands or bash knowledge do you find helpful?

A few from Session 1

• ExplainShell
• lsof
• ps
• awk

Helpful Links

• Docker
• Docker Compose
• Bash
• POSIX
• Bourne Shell (sh)
• Bourne Again Shell (bash)

Author(s)

• Matt Johnson (src-system42)

Copyright

MIT (c) 2019 Cedrus, LLC