Developer Utilities

In the following there are a lot of Developer Utilities.

Process Management

# Show running processes
ps aux

# Find process by name
ps aux | grep java
ps aux | grep node

# Kill process by PID
kill -9 <PID>

# Monitor system processes
top
htop

Port Debugging

# Check which process is using a port
sudo lsof -i :8080

# Alternative with ss
sudo ss -tulnp | grep 8080

# Kill process using a port
sudo kill -9 $(sudo lsof -t -i:8080)

Disk & File System

# Show disk usage
df -h

# Show folder size
du -sh *

# Show current folder size
du -sh .

# Find large files
find . -type f -size +100M

File Permissions

# Make script executable
chmod +x script.sh

# Change owner
sudo chown -R user:user folder/

# Change permissions recursively
chmod -R 755 folder/

Search & Logs

# Search text inside files
grep -Ri "search-text" .

# Tail logs in real time
tail -f app.log

# Last 100 lines
tail -100 app.log

# View logs with paging
less app.log

SSH & Remote Access

# SSH connection
ssh user@server-ip

# SSH with private key
ssh -i ~/.ssh/id_ed25519 user@server-ip

# Copy file to remote server
scp file.txt user@server:/path/

# Copy folder to remote server
scp -r folder user@server:/path/

Curl / API Testing

# Simple GET request
curl http://localhost:8080

# GET with headers
curl -H "Authorization: Bearer TOKEN" http://localhost:8080/api

# POST JSON request
curl -X POST http://localhost:8080/api \
-H "Content-Type: application/json" \
-d '{"name":"test"}'

Environment Variables

# Show env variables
printenv

# Show specific variable
echo $JAVA_HOME

# Reload shell config
source ~/.profile
source ~/.bashrc

Java / Maven

# Check Java version
java -version

# Check JAVA_HOME
echo $JAVA_HOME

# Maven build
mvn clean install

# Skip tests
mvn clean install -DskipTests

Node.js / NPM

# Install dependencies
npm install

# Start project
npm start

# Run dev mode
npm run dev

# Clean install
rm -rf node_modules package-lock.json
npm install

Git Utilities

# Current branch
git branch

# Show remote URLs
git remote -v

# Pull latest changes
git pull

# Clone repository
git clone <repo-url>

# Git status
git status

# Commit changes
git add .
git commit -m "message"

# View commit history
git log --oneline

Useful System Commands

# Current user
whoami

# Current path
pwd

# Show Linux version
uname -a

# Show memory usage
free -h

# Check IP address
ip a

# Ping host
ping google.com

Note: lsof, ss, tail -f, curl, and grep are among the most useful commands for debugging APIs, services, logs, and networking in day-to-day development.

Leggi