ALX System Engineering Devops

• This repository contains a collection of directories containing bash scripts as part of my Fullstack Software Engineering learning journey with ALX.
• The bash scripts demonstrate my knowledge and understanding of the use bash.
• All scripts were created and tested on an Ubuntu 20.04 environment

0x00-shell_basics/

• What is Shell?
• Navigation
• Exploring the System
• Manipulating Files and Directories
• Working with Commands
• Symbolic Links
• Expansion
• Text Editors (vi, vim and emacs)
• Magic Files

0x01-shell_permissions/

• What do the commands chmod, sudo, su, chown, chgrp do?
• Linux file permissions
• How to represent each of the three sets of permissions (owner, group, and other) as a single digit
• How to change permissions, owner and group of a file
• Why can’t a normal user chown a file
• How to run a command with root privileges
• How to change user ID or become superuser
• How to create a user
• How to create a group
• How to print real and effective user and group IDs
• How to print the groups a user is in
• How to print the effective userid

0x02-shell_redirections/

• What do the commands head, tail, find, wc, sort, uniq, grep, tr do
• How to redirect standard output to a file
• How to get standard input from a file instead of the keyboard
• How to send the output from one program to the input of another program
• How to combine commands and filters with redirections
• What are special characters
• Understand what do the white spaces, single quotes, double quotes, backslash, comment, pipe, command separator, tilde and how and when to use them

0x03-shell_variables_expansions/

• What are the /etc/profile file and the /etc/profile.d directory
• What is the ~/.bashrc file
• What is the difference between a local and a global variable
• What is a reserved variable
• How to create, update and delete shell variables
• What are the roles of the following reserved variables: HOME, PATH, PS1
• What are special parameters
• What is the special parameter $??
• What is expansion and how to use them
• What is the difference between single and double quotes and how to use them properly
• How to do command substitution with $() and backticks
• How to perform arithmetic operations with the shell
• How to create an alias
• How to list aliases
• How to temporarily disable an alias