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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

rxtelnet

RXTELNET(1)						    BSD General Commands Manual 					       RXTELNET(1)

NAME

     rxtelnet -- start a telnet and forward X-connections.

SYNOPSIS

     rxtelnet [-l username] [-k] [-t telnet_args] [-x xterm_args] [-K kx_args] [-w term_emulator] [-b telnet_program] [-n] [-v] host [port]

DESCRIPTION

     The rxtelnet program starts an xterm window with a telnet to host host.  From this window you will also be able to run X clients that will be
     able to connect securely to your X server. If port is given, that port will be used instead of the default.

     If setting up the X forwarding failes, rxtelnet will still telnet in to the remote host, but without X forwarding.

     The supported options are:

     -l      Log in on the remote host as user username.

     -k      Disables keep-alives.

     -t      Send telnet_args as arguments to telnet.

     -x      Send xterm_args as arguments to xterm.

     -X      Send kx_args as arguments to kx.

     -w      Use term_emulator instead of xterm.

     -b      Use telnet_program instead of telnet.

     -n      Do not start any terminal emulator.

     -v      Be verbose.

EXAMPLE

     To login from host foo (where your display is) to host bar, you might do the following.

     1.   On foo: rxtelnet bar

     2.   You will get a new window with a telnet to bar.  In this window you will be able to start X clients.

SEE ALSO

     kx(1), rxterm(1), telnet(1), tenletxr(1), kxd(8)

KTH_KRB 							   March 7, 2004							   KTH_KRB
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