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Full Discussion: Check telnet port multiple server
Top Forums UNIX for Beginners Questions & Answers Check telnet port multiple server Post 303035184 by stomp on Thursday 16th of May 2019 07:49:25 AM
Old 05-16-2019
Fun mode: ON

Hey you can even write your portscanner in plain bash ;-)

See here:
TCP Port Scanner in Bash

for short(GNU coreutils(for "timeout") needed or a perl script if coreutils are not available):

Code:
for port in 80 443 12345; do 
  timeout 3 echo >/dev/tcp/google.com/$port &&     
  echo "port $port is open" ||     
  echo "port $port is closed" 
 done

Hmm. Doesn't work as expected :-( ...

This one works :-) ...
Code:
for port in 80 443 12345; do 
  timeout 3 bash -c "echo >/dev/tcp/google.com/$port" &&     
  echo "port $port is open" ||     
  echo "port $port is closed" 
done

Last edited by stomp; 05-17-2019 at 04:14 AM..
 

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LEARN ABOUT DEBIAN

tcpconnect

TCPCONNECT(1)						      General Commands Manual						     TCPCONNECT(1)

NAME

       tcpconnect - general TCP/IP client

SYNOPSIS

       tcpconnect [-irv] [-l localaddr] host port

DESCRIPTION

       tcpconnect  creates  a TCP/IP connection to a server running on the machine host, listening to port port.  It then reads standard input and
       sends to the remote server, and data received from the server is printed to standard output.  When end-of-file is reached on both  standard
       input and the TCP/IP connection, tcpconnect terminates.

OPTIONS

       -i     Terminate at end-of-file on standard input; don't wait for the server to close the connection.

       -r     Terminate when the remote server closes the connection; don't wait for end-of-file on standard input.

       -v     Verbose mode.  Prints a message to standard error when the connection has been established.

       -l addr:port
	      Bind  the local end-point of the connection to IP address addr, TCP port port.  Either the IP address or the port, but not both, may
	      be left out, meaning that the operating system gets to choose that part by itself.

SEE ALSO

       tcplisten(1), telnet(1), tcpbug(1).

BUGS

       The names of the options are not yet finalized, and may change at a future release.

								   1997 April 13						     TCPCONNECT(1)
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