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Full Discussion: Perl- check the port used
Top Forums Shell Programming and Scripting Perl- check the port used Post 302523582 by Skrynesaver on Thursday 19th of May 2011 06:19:18 AM
Old 05-19-2011
I'd tend to use grep on an array rather than a string, for a string I'd go for something like the following with a straight regex. (Note: regex used works for my flavour of netstat and may need amending to work for you, (netstat 1.42 (2001-04-15) from net-tools 1.6)
Code:
#!/usr/bin/perl

#ALWAYS use these 2 lines if it's worth saving the file
use strict ;
use warnings;

my $port=$ARGV[0]; #TODO validate and print usage if wrong
my $netstat=`netstat -ln`; #get output of netstat command

#Check for service listening on the port
my ($service)=$netstat=~/\w+\s+\d+\s+\d+\s+[\d.:]+:$port\s+[\d:.]+:\*\s+LISTEN/;

if ($service){
    print "There is a service listening on $port\n"
}else{
   print"No service on $port\n";
}

Last edited by Skrynesaver; 05-19-2011 at 07:22 AM.. Reason: Left in final quote from cmndline development
This User Gave Thanks to Skrynesaver For This Post:
bassma
 

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LEARN ABOUT SUNOS

inet_type

inet_type(4)							   File Formats 						      inet_type(4)

NAME

       inet_type - default Internet protocol type

SYNOPSIS

       /etc/default/inet_type

DESCRIPTION

       The inet_type file defines the default IP protocol to use. Currently this file is only used by the ifconfig(1M) and netstat(1M) commands.

       The  inet_type  file  can  contain  a  number of <variable>=<value> lines. Currently, the only variable defined is DEFAULT_IP, which can be
       assigned a value of IP_VERSION4, IP_VERSION6, or BOTH.

       The output displayed by the ifconfig and netstat commands can be controlled by the value of DEFAULT_IP set in inet_type file.  By  default,
       both commands display the IPv4 and IPv6 information available on the system. The user can choose to suppress display of IPv6 information by
       setting the value of DEFAULT_IP.  The following shows the possible values for DEFAULT_IP and the resulting ifconfig and netstat output that
       will be displayed:

       IP_VERSION4     Displays only IPv4 related information. The output displayed is backward compatible with older versions of the ifconfig(1M)
		       and netstat(1M) commands.

       IP_VERSION6     Displays both IPv4 and IPv6 related information for ifconfig and netstat.

       BOTH	       Displays both IPv4 and IPv6 related information for ifconfig and netstat.

       The command-line options to the ifconfig and netstat commands override the effect of DEFAULT_IP as set in the inet_type file. For  example,
       even if the value of DEFAULT_IP is IP_VERSION4, the command

       example% ifconfig -a6

       will display all IPv6 interfaces.

EXAMPLES

       Example 1: Suppressing IPv6 Related Output

       This is what the inet_type file must contain if you want to suppress IPv6 related output:

       DEFAULT_IP=IP_VERSION4

SEE ALSO

       ifconfig(1M), netstat(1M)

SunOS 5.10							    16 Jun 1999 						      inet_type(4)
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