Monday, September 21 Live

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Developer Resources

Handy cheatsheets and quick references for everyday development.

Git

git switch -c feature
Create and switch to a new branch
git restore --staged <file>
Unstage a file
git rebase -i HEAD~3
Interactively rewrite the last 3 commits
git log --oneline --graph
Compact commit graph
git stash pop
Reapply the most recent stash
git reset --hard origin/main
Discard local changes to match remote

Docker

docker ps -a
List all containers
docker compose up -d
Start services in the background
docker exec -it <id> sh
Open a shell inside a container
docker logs -f <id>
Follow container logs
docker system prune -af
Remove unused data (careful)
docker build -t app .
Build an image from the Dockerfile

Linux

grep -rn 'text' .
Recursively search for text with line numbers
chmod +x script.sh
Make a script executable
tar -xzf file.tar.gz
Extract a gzipped tarball
ss -tulpn
List listening ports
systemctl status nginx
Check a service's status
df -h
Show disk usage, human readable

SQL

SELECT * FROM t LIMIT 10;
Preview the first rows
CREATE INDEX idx ON t(col);
Add an index to speed lookups
EXPLAIN ANALYZE <query>;
Inspect a query plan
LEFT JOIN b ON a.id = b.a_id
Keep all left rows
GROUP BY col HAVING COUNT(*) > 1
Filter groups after aggregation
UPDATE t SET x=1 WHERE id=5;
Update matching rows

Next.js

export const revalidate = 60
ISR: revalidate a route every 60s
'use client'
Mark a component as client-side
generateStaticParams()
Pre-render dynamic routes at build
revalidatePath('/news')
Invalidate a cached route after a mutation
notFound()
Render the 404 boundary
<Image fill sizes=... />
Responsive optimized images

Security

openssl rand -base64 32
Generate a strong secret
ssh-keygen -t ed25519
Create a modern SSH key
curl -I https://site
Inspect response headers
chmod 600 ~/.ssh/id_ed25519
Lock down a private key
dig +short example.com
Quick DNS lookup
nmap -sV host
Service/version detection