Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

# ---- ss: socket statistics ----

# Show all TCP and UDP listening ports
ss -tulnp

# Show all established TCP connections
ss -tnp state established

# Show connections to a specific port
ss -tnp sport = :443

# Show all sockets (listening + established)
ss -anp

# ---- netstat (legacy) ----
netstat -tulnp          # Listening ports with processes
netstat -an             # All connections

# ---- curl examples ----

# Simple GET request
curl https://api.github.com/users/torvalds

# Follow redirects
curl -L https://example.com

# Download a file
curl -O https://example.com/file.tar.gz

# Download and save with custom name
curl -o myfile.tar.gz https://example.com/file.tar.gz

# Show response headers only
curl -I https://example.com

# Verbose output (headers + body)
curl -v https://example.com 2>&1 | head -50

# POST JSON data
curl -X POST https://api.example.com/data \
     -H "Content-Type: application/json" \
     -H "Authorization: Bearer $TOKEN" \
     -d '{"key": "value"}'

# Check HTTP status code only
curl -o /dev/null -s -w "%{http_code}" https://example.com

# ---- wget ----
wget https://example.com/file.tar.gz
wget -c https://example.com/largefile.iso   # Resume interrupted download
wget -q --spider https://example.com        # Check URL without downloading

# ---- ping and traceroute ----
ping -c 4 google.com
traceroute google.com
tracepath google.com