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Linux command: netstat

netstat - Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships

List of options

    -a: all
    -l: listening
    -s: statistics
    -r: routing table
    -i: interface
    -n: no resolve IP address to hostname
    -u: unix
    -p: PID

Check open ports with netstat

netstat -tupln | grep LISTEN
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