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nc

reads and writes tcp or udp data

listen on a specified port

nc -l {{port}}

connect to a certain port (you can then write to this port)

nc {{ip_address}} {{port}}

set a timeout

nc -w {{timeout_in_seconds}} {{ipaddress}} {{port}}

serve a file

cat somefile.txt | nc -l {{port}}

receive a file

nc {{ip_address}} {{port}} > somefile.txt

server stay up after client detach

nc -k -l {{port}}

client stay up after EOF

nc -q {{timeout}} {{ip_address}}