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Full Discussion: Perl- check the port used
Top Forums Shell Programming and Scripting Perl- check the port used Post 302523522 by bassma on Thursday 19th of May 2011 04:41:41 AM
Old 05-19-2011
Error Perl- check the port used

hi everybody;
my code is cheking if a port is an actif or not with the cmd netstat -ln,I want first to enter the number of the port which I want to check it but I think that the value of $con in the second "if" is always "0" so the code give me always that the port is not used!!!

Code:
#!/usr/bin/perl
print "enter the port :\n";
$port=<STDIN>;
$con=0;
open (FILE,"-|") exec "netstat -ln |grep" .$port;
open (FIL,">res.txt");
whiel (<FILE>){
if ($_ =~/:$port/){$con++;}}
if ($con){
print FIL "The active port is : $port\n"}
else{
print FIL "the port is not active\n";}
close FIL;
close FILE;

 

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RSUPLNK(8)						     Linux Programmer's Manual							RSUPLNK(8)

NAME
rsuplnk - User entry into the ROSE network. SYNOPSIS
rsuplnk [-q] <port> DESCRIPTION
The rsuplnk program allows a user to gain entry into the ROSE network using the standard pseudo-digipeating method. Recent Linux kernels are aware of this form of operation and the ax25d program can listen for such connections. The normal mode of operation of a ROSE switch is to have one ROSE address (ie port) per physical AX.25 port. Therefore ROSE users coming in on a given AX.25 port will appear as if they come from the associated ROSE port. This is the reason for the need for a ROSE port as an argument. To use rsuplnk you need an entry in ax25d.conf to listen for incoming connections. In the example below, I will be listening for ROSE con- nections on my AX.25 port 144 using the callsign KE4GAJ-10 and the ROSE port associated with the AX.25 port is rs144. # [KE4GAJ-10* VIA 144] NOCALL * * * * * * L default * * * * * * - root /usr/sbin/rsuplnk rsuplnk rs144 # There would typically be one rsuplnk per user access AX.25 port. The associated program for exiting a ROSE network is rsdwnlnk. All errors generated by rsuplnk are written to the system debug log file. OPTIONS
-q Supresses the messages generated by rsuplnk when making the connection. FILES
/etc/ax25/rsports SEE ALSO
rose(4), ax25d.conf(5), ax25d(8), rsdwnlnk(8), rose_call(8). AUTHOR
Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk> Linux 29 April 1997 RSUPLNK(8)
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