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rafaeltuelho/linux-tcp-conn-test.md

Last active January 5, 2020 11:31
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testing a TCP connection on Linux without telnet
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linux-tcp-conn-test.md
  • option 1) just with echo
TCP_PORT_STATUS=`(echo > /dev/tcp/x.x.x.x/yyyy) >/dev/null 2>&1 && echo "UP" || echo "DOWN"`; echo $TCP_PORT_STATUS

where x.x.x.x is a valid IP ADDR or a HOSTNAME accesible on your network; and yyyy is valid TCP PORT

  • option 2) using Netcat tool
nc -vz IP_Address Port

you need to install netcat tool on you system. For Red Hat like use yum install nc

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