Code: Bash

Test Brackets

[[ ]] string tests and (( )) arithmetic tests

Pipes & Redirection

Streams, tee, process substitution, and heredocs

Quoting & Escaping

Single versus double quotes and $'...' literals

Globs & Brace Expansion

Wildcards, {a,b} lists, and numeric ranges

Checkpoint: Symbol Fluency

Every shell glyph cluster from this module in one longer drill

Keywords

Bash reserved words

Declarations

Variables, arrays, and declare flags

Arrays & Associative Arrays

Indexing, expansion, and keyed lookups

case & until

Dispatch tables and wait loops

Idiomatic Patterns

Parameter expansion in daily use

Parameter Expansion Catalog

Defaults, required values, trimming, and case folding

Checkpoint: Keywords & Idioms

A field tally built from a pipe, an array, and a sort

Control Flow

Loops, arithmetic conditions, and tests

Functions & Methods

Shell helpers with locals and guards

awk One-Liners

Field extraction, sums, and formatted output

sed & grep One-Liners

In-place edits, line ranges, and recursive searches

Traps & Temp Files

mktemp, lock files, and cleanup that always runs

Realistic Snippet

Deploy script with logging, traps, and argument parsing

find & xargs Pipelines

Null-delimited batches and parallel fan-out

Checkpoint: Real Snippets

A sensor summary built from awk inside a guarded script

Speed Run: Config Loader

A key=value parser typed end to end without stopping

Speed Run: Log Pipeline

awk, sort, and uniq chained at full pace

Speed Run: getopts Parser

Flags, values, usage text, and OPTIND in one run

Speed Run: Retry Loop

A curl health check with backoff and exit codes

Speed Run: Tests & Asserts

A slugify function plus a hand-rolled assertion harness

Checkpoint: Sustained Speed

An event-latency report typed in one continuous run

Assessment Sim 1: Database Backup

A complete backup script with logging, guards, and retention

Assessment Sim 2: Temperature Stats

A full stdin-to-summary program with validation

Assessment Sim 3: RPN Calculator

A complete stack evaluator with error paths

Assessment Sim 4: Inventory Ledger

A full stock-movement program with rejections

Checkpoint: Bash Mastery Final

A ranked traffic report -- the course's graded final