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Enterprise Shell scripting with Bash 5.2, ShellCheck, bats-core testing, POSIX compliance, and Context7 MCP integration for defensive scripting patterns.
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Enterprise database architecture specialist with PostgreSQL 17, MySQL 8.4 LTS, MongoDB 8.0, Redis 7.4 expertise. Master connection pooling, query optimization, caching strategies, and database DevOps automation. Build scalable, resilient database systems with comprehensive monitoring and disaster recovery.
Enterprise Frontend Development with AI-powered modern architecture, Context7 integration, and intelligent component orchestration for scalable user interfaces
Enterprise-grade security expertise with production-ready patterns for OWASP Top 10 2021, zero-trust architecture, threat modeling (STRIDE, PASTA), secure SDLC, DevSecOps automation, cloud security, cryptography, identity & access management, and compliance frameworks (SOC 2, ISO 27001, GDPR, CCPA).
SOC 직업 분류 기준
SKILL.md 표시 중
| name | moai-lang-shell |
| version | 4.0.0 |
| tier | Language |
| description | Enterprise Shell scripting with Bash 5.2, ShellCheck, bats-core testing, POSIX compliance, and Context7 MCP integration for defensive scripting patterns. |
| primary-agent | alfred |
| secondary-agents | ["tdd-implementer","test-engineer","code-reviewer"] |
| keywords | ["shell","bash","shellcheck","bats","posix","scripting","testing","linting"] |
| status | stable |
| allowed-tools | ["Read","Bash","mcp__context7__resolve-library-id","mcp__context7__get-library-docs"] |
Enterprise Shell scripting with Bash 5.2+, static analysis (ShellCheck), bats-core testing framework, POSIX compliance, and defensive scripting patterns. This skill provides production-grade shell scripting guidance for system administration, CI/CD, and infrastructure automation.
Automatic activation:
Manual invocation:
| Component | Version | Purpose | Status |
|---|---|---|---|
| Bash | 5.2.37 | Core shell | Current |
| ShellCheck | 0.10.0 | Static analysis | Current |
| bats-core | 1.11.0 | Testing framework | Current |
| bats-assert | 2.1.0 | Test assertions | Current |
| jq | 1.7.1 | JSON processing | Optional |
| sed/awk | GNU | Text processing | Built-in |
Bash provides powerful parameter expansion for safe string handling:
config=
filename=
name=
extension=
value=
text=
Key Benefits:
Proper signal handling prevents zombies and resource leaks:
#!/bin/bash
set -euo pipefail # Defensive mode
cleanup() {
[[ -n "${temp_file:-}" ]] && rm -f "$temp_file"
[[ -n "${bg_pid:-}" ]] && kill $bg_pid 2>/dev/null || true
}
trap cleanup EXIT # Cleanup on exit
trap 'exit 130' INT # Handle Ctrl+C
trap 'exit 143' TERM # Handle termination
Key Benefits:
# Indexed arrays
files=("file1.txt" "file2.txt")
for file in "${files[@]}"; do
process "$file"
done
# Associative arrays (dictionaries)
declare -A config
config[url]="https://api.example.com"
config[key]="secret123"
echo "${config[url]}"
# Set error options
set -euo pipefail
# Error trapping
error_handler() {
echo "Error on line $1: $(tail -1 <(sed -n "$1p" "$0"))" >&2
exit 1
}
trap 'error_handler $LINENO' ERR
# Safe command execution
if ! command_that_might_fail; then
echo "Failed with exit code $?" >&2
exit 1
fi
validate_not_empty() {
local var=$1
local name=$2
[[ -z "$var" ]] && { echo "Error: $name is empty" >&2; return 1; }
}
validate_file() {
local file=$1
[[ ! -f "$file" ]] && { echo "Error: File not found: $file" >&2; return 1; }
}
# Usage
validate_not_empty "$username" "Username" || exit 1
validate_file "$config_file" || exit 1
# Good: Quoted variables
echo "$var" # SC2086 prevention
# Good: Command existence check
command -v python3 &>/dev/null || {
echo "Python 3 not found" >&2
exit 1
}
# Good: Proper array iteration
for file in "${files[@]}"; do # SC2068 prevention
process "$file"
done
# Disable warnings when necessary
# shellcheck disable=SC1091
source /etc/profile.d/custom.sh
#!/usr/bin/env bats
source ./functions.sh
@test "add function returns correct sum" {
result=$(add 5 3)
[[ "$result" == "8" ]]
}
@test "error handling returns error code" {
run safe_divide 10 0
[[ $status -eq 1 ]]
[[ "$output" =~ "Error" ]]
}
@test "file operations handle missing files" {
run process_file "nonexistent.txt"
[[ $status -eq 1 ]]
}
# Run all tests
bats tests/
# Run specific test
bats tests/test_functions.bats -f "add function"
# Run with TAP output
bats --tap tests/
# GOOD: Use built-in commands
while read -r line; do
echo "$line"
done < file.txt
# AVOID: Unnecessary external commands
cat file.txt | while read -r line
# Lazy evaluation with process substitution
diff <(sort file1.txt) <(sort file2.txt)
# Avoid:
sort file1.txt > temp1
sort file2.txt > temp2
diff temp1 temp2
rm temp1 temp2
# GOOD: Local scope prevents polluting global namespace
fast_function() {
local count=0
local result=""
for i in {1..1000}; do
((count++))
done
echo "$count"
}
# AVOID: Global variables cause issues
function slow_function() {
count=0
result=""
# ...
}
For maximum portability across different shells (bash, dash, ksh):
#!/bin/sh
# POSIX-compliant script
# Use [ ] instead of [[ ]]
if [ -f "file.txt" ]; then
echo "File exists"
fi
# Use $() instead of backticks
date=$(date +%Y-%m-%d)
# Use expr for arithmetic (POSIX)
result=$(expr 5 + 3)
# POSIX arrays (positional parameters)
set -- "apple" "banana" "cherry"
echo "First: $1"
echo "All: $*"
#!/bin/bash
set -euo pipefail # Exit on error, undefined, pipe failure
IFS=$'\n\t' # Safer default separator
# GOOD
echo "$var"
for file in "${files[@]}"
# AVOID
echo $var
for file in $files
function my_func() {
local var="value"
local result=$(compute)
echo "$result"
}
trap cleanup EXIT
trap 'error_handler $LINENO' ERR
[[ -z "$username" ]] && { echo "Username required" >&2; exit 1; }
[[ ! -f "$config" ]] && { echo "Config not found" >&2; exit 1; }
log() {
local timestamp=$(date '+%Y-%m-%d %H:%M:%S')
echo "[$timestamp] $*" | tee -a app.log
}
log_error() {
log "ERROR: $*" >&2
}
load_config() {
local file="${1:-.config}"
[[ ! -f "$file" ]] && return 1
while IFS='=' read -r key value; do
[[ "$key" =~ ^#.*$ ]] && continue
[[ -z "$key" ]] && continue
export "$key=$value"
done < "$file"
}
temp_file=$(mktemp) || exit 1
trap 'rm -f "$temp_file"' EXIT
# Use temp_file
echo "data" > "$temp_file"
This skill integrates with Context7 for real-time documentation access:
/gnu/bash/gnu/coreutils/posix/shell| Category | Target | Tools |
|---|---|---|
| Unit Tests | 80% | bats-core |
| Integration Tests | 15% | bats + external tools |
| Linting | 100% | ShellCheck |
moai-foundation-security (Security patterns)moai-foundation-testing (Testing strategies)moai-essentials-debug (Debugging)moai-cc-mcp-integration (MCP integration)examples.md (23 examples covering all patterns)reference.md (commands, syntax, troubleshooting)Last updated: 2025-11-13