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Full Discussion: Perl- check the port used
Top Forums Shell Programming and Scripting Perl- check the port used Post 302523546 by pludi on Thursday 19th of May 2011 05:13:14 AM
Old 05-19-2011
  1. use strict; and use warnings; will catch & tell you about a lot of potential errors if you let them
  2. Without chomp $port will still have a newline at the end of the string, which will be included in any match attempt.
  3. Why do you grep and then do additional filtering in Perl, when you can do it all in Perl?
This User Gave Thanks to pludi For This Post:
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LEARN ABOUT DEBIAN

netstat-nat

netstat-nat(1)						      General Commands Manual						    netstat-nat(1)

NAME

       netstat-nat - Show the natted connections on a linux iptable firewall

SYNOPSIS

       netstat-nat [options]

DESCRIPTION

       netstat-nat Displays NAT connections managed by netfilter/iptables which comes with the > 2.4.x linux kernels.

       The  program  reads  its information from '/proc/net/ip_conntrack' or '/proc/net/nf_conntrack', which is the temporary conntrack-storage of
       netfilter.

OPTIONS

       -h     displays help

       -n     don't resolve IPs/portnumbers to host/portnames

       -p <protocol>
	      display NAT connections with protocol selection (see /etc/protocols)

       -s <source host>
	      display connections by source IP/hostname

       -d <destination host>
	      display connections by destination IP/hostname

       -S     display SNAT connections

       -D     display DNAT connections

       -L     display only connections to NAT box self (doesn't show SNAT & DNAT)

       -R     display only connections routed through the NAT box (doesn't show SNAT & DNAT)

       -x     extended view of hostnames

       -r <src|dst|src-port|dst-port|state>
	      sort connections

       -o     no output header

       -N     display NAT box connection information (only valid with SNAT & DNAT)

       -v     prints version

FILES

       /proc/net/ip_conntrack or /proc/net/nf_conntrack

SEE ALSO

       http://www.tweegy.nl/projects/netstat-nat/
       http://www.netfilter.org/

AUTHOR

       netstat-nat has been written by D.Wijsman danny@tweegy.nl
       The manual page has been written by marceln@xs4all.nl

								     July 2002							    netstat-nat(1)
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