Bash Scripting Basics

Learn to write basic shell scripts for linux and unix, including hello world output, using any text editor, making scripts executable, and reading input into variables with the dollar sign.

Learn to store data in bash with variables. Use quotes for text and numbers, reference with a dollar sign, follow naming rules, and make scripts executable with chmod +x.

Learn how to pass parameters to bash scripts, access them with $0, $1, $2, and $#, make scripts executable, and manage process ids with $$ and kill.

Explore how bash if statements evaluate conditions on variables to run or skip code blocks. Master equality and not equal checks and greater than and smaller than comparisons.

Explore bash for loops and while loops to repeat code blocks a set number of times or until conditions are met, with examples from ranges, user input, and simple prints.

Replace many individual variables with arrays to store names, access items by zero-based indices in brackets, and loop over the list with a for loop to output each name.

Learn how to run multiple shell commands sequentially with a bash script, execute each line in order, and automate tasks by capturing command outputs into variables.

Build a simple bash script that outputs network information, clears the screen, prints a header, and runs commands line by line to reveal IPv4 addresses, devices, and current connections.

Learn how to redirect command output to a file in bash using the greater-than symbol. Save outputs to the home directory and verify the file contains the script's output.

Split large Bash scripts into functions to organize hundreds of commands, define them with curly braces, call by name, and reuse in loops for readability.