Shell — Shell Scripting Reference
Quick-reference skill for Bash shell scripting, built-in features, and best practices.
When to Use
- Writing reliable Bash scripts with proper error handling
- Understanding redirections, pipes, and process substitution
- Managing signals, traps, and background processes
- Debugging shell scripts with set options and tracing
- Choosing between shell features and external tools
Commands
intro
scripts/script.sh intro
Overview of shell scripting — Bash features, shebang, execution, portability.
variables
scripts/script.sh variables
Variables — declaration, scope, arrays, parameter expansion, special variables.
control
scripts/script.sh control
Control flow — if/else, case, for, while, until, select, functions.
redirections
scripts/script.sh redirections
Redirections and pipes — stdin/stdout/stderr, heredocs, process substitution.
safety
scripts/script.sh safety
Safety practices — set -euo pipefail, quoting, shellcheck, error handling.
tools
scripts/script.sh tools
Essential tools — awk, sed, grep, find, xargs, cut, sort, jq patterns.
signals
scripts/script.sh signals
Signals and traps — SIGTERM, SIGINT, cleanup handlers, background jobs.
checklist
scripts/script.sh checklist
Shell script quality checklist.
help
scripts/script.sh help
version
scripts/script.sh version
Configuration
| Variable | Description |
|---|---|
SHELL_DIR |
Data directory (default: ~/.shell/) |
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