Bash/Linux terminal patterns. Critical commands, piping, error handling, scripting. Use when working on macOS or Linux systems.
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Essential patterns for Bash on Linux/macOS.
| Operator | Meaning | Example |
|---|---|---|
; | Run sequentially | cmd1; cmd2 |
&& | Run if previous succeeded | npm install && npm run dev |
|| | Run if previous failed | npm test || echo "Tests failed" |
| | Pipe output | ls | grep ".js" |
| Task | Command |
|---|---|
| List all | ls -la |
| Find files | find . -name "*.js" -type f |
| File content | cat file.txt |
| First N lines | head -n 20 file.txt |
| Last N lines | tail -n 20 file.txt |
| Follow log | tail -f log.txt |
| Search in files | grep -r "pattern" --include="*.js" |
| File size | du -sh * |
| Disk usage | df -h |
| Task | Command |
|---|---|
| List processes | ps aux |
| Find by name | ps aux | grep node |
| Kill by PID | kill -9 <PID> |
| Find port user | lsof -i :3000 |
| Kill port | kill -9 $(lsof -t -i :3000) |
| Background | npm run dev & |
| Jobs | jobs -l |
| Bring to front | fg %1 |
| Tool | Purpose | Example |
|---|---|---|
grep | Search | grep -rn "TODO" src/ |
sed | Replace | sed -i 's/old/new/g' file.txt |
awk | Extract columns | awk '{print $1}' file.txt |
cut | Cut fields | cut -d',' -f1 data.csv |
sort | Sort lines | sort -u file.txt |
uniq | Unique lines | sort file.txt | uniq -c |
wc | Count | wc -l file.txt |
| Task | Command |
|---|---|
| View all | env or printenv |
| View one | echo $PATH |
| Set temporary | export VAR="value" |
| Set in script | VAR="value" command |
| Add to PATH | export PATH="$PATH:/new/path" |
| Task | Command |
|---|---|
| Download | curl -O https://example.com/file |
| API request | curl -X GET https://api.example.com |
| POST JSON | curl -X POST -H "Content-Type: application/json" -d '{"key":"value"}' URL |
| Check port | nc -zv localhost 3000 |
| Network info | ifconfig or ip addr |
#!/bin/bash
set -euo pipefail # Exit on error, undefined var, pipe fail
# Colors (optional)
RED='\033[0;31m'
GREEN='\033[0;32m'
NC='\033[0m'
# Script directory
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# Functions
log_info() { echo -e "${GREEN}[INFO]${NC} $1"; }
log_error() { echo -e "${RED}[ERROR]${NC} $1" >&2; }
# Main
main() {
log_info "Starting..."
# Your logic here
log_info "Done!"
}
main "$@"
if command -v node &> /dev/null; then
echo "Node is installed"
fi
NAME=${1:-"default_value"}
while IFS= read -r line; do
echo "$line"
done < file.txt
for file in *.js; do
echo "Processing $file"
done
| Task | PowerShell | Bash |
|---|---|---|
| List files | Get-ChildItem | ls -la |
| Find files | Get-ChildItem -Recurse | find . -type f |
| Environment | $env:VAR | $VAR |
| String concat | "$a$b" | "$a$b" (same) |
| Null check | if ($x) | if [ -n "$x" ] |
| Pipeline | Object-based | Text-based |
set -e # Exit on error
set -u # Exit on undefined variable
set -o pipefail # Exit on pipe failure
set -x # Debug: print commands
cleanup() {
echo "Cleaning up..."
rm -f /tmp/tempfile
}
trap cleanup EXIT
Remember: Bash is text-based. Use
&&for success chains,set -efor safety, and quote your variables!
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Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
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Expert in building 3D experiences for the web - Three.js, React Three Fiber, Spline, WebGL, and interactive 3D scenes. Covers product configurators, 3D portfolios, immersive websites, and bringing depth to web experiences. Use when: 3D website, three.js, WebGL, react three fiber, 3D experience.
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When the user wants to plan, design, or implement an A/B test or experiment. Also use when the user mentions "A/B test," "split test," "experiment," "test this change," "variant copy," "multivariate test," or "hypothesis." For tracking implementation, see analytics-tracking.
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This skill should be used when interacting with Apple Calendar on macOS. Use it for listing calendars, viewing events, creating/updating/deleting calendar events, and checking availability/free-busy times. Triggers on requests like "check my calendar", "schedule a meeting", "what's on my schedule", "am I free tomorrow", or any calendar-related operations.
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This skill should be used when the user asks to "attack Active Directory", "exploit AD", "Kerberoasting", "DCSync", "pass-the-hash", "BloodHound enumeration", "Golden Ticket", "Silver Ticket", "AS-REP roasting", "NTLM relay", or needs guidance on Windows domain penetration testing.
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ActiveCampaign CRM integration for lead management, deal tracking, and email automation. Use for syncing demo leads, managing clinic sales pipeline, and triggering follow-up sequences.
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