Bash Roadmap - simpleprog

simpleprog

Foundations

▸ Basic Parameter Expansion Forms

▸ String Manipulation Expansion

▸ Indirect Expansion & Name References

Core Concepts

▸ Arrays & Array Expansion

▸ Pattern Matching & Wildcard Expansion

▸ Arithmetic & Base Conversion

Intermediate Skills

▸ Here Documents & Here Strings

▸ Subshell Execution (())

▸ Process Substitution (<(cmd), >(cmd))

Advanced Topics

▸ Command Substitution ($(), backtick)

▸ Subshell Variable Scope

▸ Nested Subshells

Expert Level

▸ Process Substitution vs Pipes

▸ Coprocesses (coproc)

▸ Indexed Arrays (declare -a)

Mastery

▸ Associative Arrays (declare -A, Bash 4+)

▸ Array Operations (slice, concat, transform)

▸ Looping Over Arrays

Ecosystem

▸ Array Sorting & Deduplication

▸ Array from Command Output (mapfile)

▸ Multi-Dimensional Arrays (simulated)

Architecture

▸ Bash Regex with =~

▸ Bracket Expressions & POSIX Character Classes

▸ Extended Globbing (extglob)

Optimization

▸ Sed with Extended Regex

▸ Awk Pattern Matching

▸ Grep and Perl-Compatible Regex

Deployment

▸ Regex Performance in Bash

▸ File Descriptor Manipulation

▸ Redirection Operators (<, >, >>, 2>&1)

Phase 11

▸ Named Pipes (FIFO)

▸ IO Redirection Order

▸ Socket Redirection (/dev/tcp)

Phase 12

▸ Buffer & Race Conditions in I/O

▸ Redirection with exec

▸ Function Definition & Return

Phase 13

▸ Local Variables (local) & Scoping

▸ Function Arguments ($@, $*, shift)

▸ Recursive Functions

Phase 14

▸ Function Export (export -f)

▸ Trap in Functions

▸ Autoloading Functions

Phase 15

▸ Signal Handling (trap)

▸ Common Signals (SIGINT, SIGTERM, SIGHUP)

▸ Cleanup Handler Pattern (trap EXIT)

Phase 16

▸ Signal Masking & Propagation

▸ Process Group Signaling (kill -- -PGID)

▸ Timeouts with trap ALRM

Phase 17

▸ Debugging with trap DEBUG

▸ set -e, -u, -o pipefail

▸ Bash Execution Tracing (set -x, PS4)

Phase 18

▸ ShellCheck Static Analysis

▸ Bash -n Syntax Checking

▸ errexit Pitfalls

Phase 19

▸ Debug Hooks (PS4, DEBUG trap)

▸ Bash Debugger (bashdb)

▸ Process Startup Overhead (exec vs builtin)

Phase 20

▸ Avoid Useless forking

▸ Brace Expansion Speed

▸ printf vs echo

Phase 21

▸ Built-in vs External Commands

▸ Reading Files Efficiently (read -N, mapfile)

▸ Parallel Execution Overhead

Phase 22

▸ Injection Attacks (eval, $() in strings)

▸ Sanitizing Input

▸ PATH & Environment Attacks

Phase 23

▸ File Permission Checks

▸ Temporary File Safety (mktemp)

▸ setuid Script Risks

Phase 24

▸ Shellshock (CVE-2014-6271)

▸ /dev/tcp & /dev/udp

▸ Netcat (nc) Patterns

Phase 25

▸ curl REST API Scripting

▸ HTTP Server in Bash (socat)

▸ DNS Queries (host, dig)

Phase 26

▸ SSH Automation (ssh, scp, rsync)

▸ Network Diagnostics (ping, traceroute, mtr)

▸ Grep Patterns & Performance

Phase 27

▸ Sed Commands & Addresses

▸ Awk Scripting (Records, Fields, Arrays)

▸ Cut, Paste, Join, Sort, Uniq

Phase 28

▸ Pipe & Process Chains

▸ Xargs Tricks (Parallel, Delimiter)

▸ Large File Streaming

Phase 29

▸ Background Processes (&)

▸ Wait for Job Completion

▸ GNU Parallel Tool

Phase 30

▸ xargs -P (parallel)

▸ Job Control (fg, bg, jobs, disown)

▸ Semaphore Pattern with flock

Phase 31

▸ Parallel Download Scripts

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