Bash

Beginner Topics

Variables and Data Types: declaring and using variables, understanding data types (e.g., integer, string, array)
Basic Operators: arithmetic, comparison, logical, assignment, and bitwise operators
Control Structures: if-else statements, for loops, while loops, until loops, case statements

Loops

• Double paranthesis is used for arithematic expression, single paranthesis is used to group commands.

• while [ $i -lt 5] sqaure brackets are used for conditional evaluation

i=0 while [ $i -lt 5 ]; do echo "$i" i=$((i + 1)) done

• until similar to while keyword, executes until the condition is false.

  Functions: defining and calling functions, function arguments, return values Input/Output: reading input from the user, reading from files, writing to files, output redirection Basic Scripting: writing and running simple scripts, using shebang lines, executing scripts with arguments

Intermediate Topics

File Management: creating, deleting, copying, moving, renaming files, using find, grep, etc.
Text Processing: using sed, awk, tr, etc. to manipulate text, regular expressions
String Manipulation: using parameter expansion, string slicing, and other techniques to manipulate strings
Arrays and Lists: using arrays and lists to store and manipulate data
Conditional Statements: using if, elif, else, and case statements to control script flow
Loops and Iteration: using for, while, and until loops to iterate over data

Advanced Topics

Functions and Modules: creating and using functions, modules, and libraries
Error Handling: using try-catch blocks, error codes, and exit statuses to handle errors
Debugging: using set -x, set -v, and other techniques to debug scripts
Performance Optimization: optimizing script performance using techniques like caching, buffering, and parallel processing
Security: understanding security best practices, using secure coding techniques, and avoiding common security pitfalls
Scripting for Automation: using Bash to automate tasks, create cron jobs, and schedule scripts

Specialized Topics

System Administration: using Bash to manage users, groups, processes, and system resources
Networking: using Bash to configure networks, manage network interfaces, and troubleshoot network issues
Text Processing and Parsing: using Bash to parse and process text data, including CSV, JSON, and XML
Data Analysis and Science: using Bash to analyze and visualize data, including data cleaning, filtering, and aggregation
Web Development: using Bash to create web applications, including CGI scripts, web servers, and web frameworks

Best Practices and Tools

Code Style and Conventions: following best practices for code style, naming conventions, and commenting
Version Control: using Git and other version control systems to manage script changes
Testing and Validation: using testing frameworks and validation techniques to ensure script correctness
Code Review and Collaboration: collaborating with others on script development, reviewing code, and providing feedback
Scripting Tools and Utilities: using tools like bashdb, bashlint, and shellcheck to improve scripting productivity and quality