Check telnet port multiple server


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# 8  
Everyone should scan their own IT network and devices from time to time for IT security reasons.

Everyone should to backups their own IT network and devices often for IT security reasons.

Everyone should keep their system and apps updated to the latest software versions as soon as they reasonably can for IT security reasons.
# 9  
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 05:14 AM..
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