Lab Examples

Foundations

Start here. These four files show the syntax, quoting and expansion rules from the early lessons. Each one prints its own explanation as it runs.

#	Description	Link
1	Hello World and exit status	View
2	Variables, quoting and defaults	View
3	Expansion and command substitution	View
4	Indexed and associative arrays	View

Redirection, pipelines and globbing — the plumbing that makes small tools compose.

#	Description	Link
5	Redirection, pipes and here-documents	View
6	Globbing and safe filename loops	View

Branching, iteration, functions and arithmetic. This is where a script becomes a program.

#	Description	Link
7	Conditionals: if, [[ ]] and case	View
8	Loops: for, while, until	View
9	Functions, arguments and return codes	View
10	Arithmetic and floating point with bc	View

Files, text processing, background jobs and environment inspection against the real system.

#	Description	Link
11	File tests, find and safe temp files	View
12	Text processing with grep, sed and awk	View
13	Background jobs, wait and traps	View
14	Environment variables and shell options	View

Two templates to copy into real work: a strict-mode skeleton and a proper command-line parser.

#	Description	Link
15	Strict-mode template with cleanup	View
16	Command-line parsing with getopts	View

Run any demo locally after downloading it:

chmod +x 01_hello.sh
./01_hello.sh

Every demo is a single file with no dependencies beyond Bash and the standard GNU utilities, so it runs on Linux, WSL2 and Git Bash alike.