Hi R., I got struck now.I have one problem . My code has been working fine untill the host exist,But suppose if I have given some xyz ip which is not in that network, then its not working.So I want it to tell that Ip is unreachable or any other error msg.Give me some hint

My code is

open CMD, "/bin/ping -c $count -i $interval -s $packetsize -w $allowab
+leTime $host |" or die "Can't open ping: $!";
#print "$success \n";
my (@values1,@val1,@values2,@val2,@values3,@values4,@values5); 
 while (<CMD>) {
     
    if ( $_ =~ /PING/ ){
           @values1 = split ;
          @val1 = split(/\(/,$values1[3]); 
         $val1[1] =~ s/\)//;
           }  
    
      if ($. == 2) {
        @values2 = split;
          @val2 = split(/\=/ , $values2[5]);
           }
      if ($_ =~ /packets/) {
          #print "$_ ";
         @values3 = split;
          }
      if ($_ =~ /^rtt/) {
           #print "$_ ";
        @values4 = split /\=/;
         @values5 = split(/\// ,$values4[1]);
        }
   }
[download]

I hope you help me out of this.....Thanks

Can you please add comments to your code with examples of what the ping returns in each case. I think you may be looking for several different failure modes:

• Can not resolve name to IP
• Can not reach that IP
• That IP is not responding

As different OS/Ping combinations have different results it is hard for us to know what you are looking at in each case. If you add an example of each, in a comment before the related if statement, it will make debugging much easier. Not just for your fellow monks, but also for future maintainers of your code, including your future self.

Cheers,
R.

Pereant, qui ante nos nostra dixerunt!

Ok R. Below,I am trying to modify and add comment in my code

#!/usr/bin/perl  -w
use String::Util 'trim';

=head1 NAME

ping_linux.pl - This script works on Linux system  pings a host and re
+turns statistics data.

=head1 VERSION

Version 1.0

=head1 AUTHOR

Gaurav Dubey (gaurav.d@ronankiinfotech.com

=head1 SYNOPSIS

  ./ping_linux.pl [-c --> count (Number of echo requests to be sent)] 
+[-i --> interval (Interval in milliseconds between echo  requests)] [
+-s --> packetsize (Size of icmp packet)] [-h --> destinationIP (Ip ad
+dress of destination host)] [-w --> AllowableTime (Max time in second
+s for sending receiving echo requests/reponse)]"

=head1 DESCRIPTION

This pings a host via the system ping command and returns RTA ,Tx pack
+ets,Rx packets,TTL,Packet-loss

=cut

use strict;

use Getopt::Long;
use Pod::Usage;

my ($host,$count,$interval,$packetsize,$allowableTime);
GetOptions(
    "h|host=s",    \$host,
    "c|count=i",    \$count,
    "i|interval=i",     \$interval,
    "s|packetsize=i", \$packetsize,
    "w|allowableTime=i",\$allowableTime,
);

#pod2usage("$0: No host given!\n") unless($host);
pod2usage("$0:No host given!\n") unless($host && $host =~ /^((([2][5][
+0-5]|([2][0-4]|[1][0-9]|[0-9])?[0-9])\.){3})([2][5][0-5]|([2][0-4]|[1
+][0-9]|[0-9])?[0-9])$/);
$count = 5 unless ($count);
$interval = 1 unless ($interval);
$packetsize = 56 unless ($packetsize);
$allowableTime = 1 unless ($allowableTime);

#Here I am opening a ping process on linux system .
open CMD, "/bin/ping -c $count -i $interval -s $packetsize -w $allowab
+leTime $host |" or die "Can't open ping: $!";

#This code has been working fine by executing "./ping_linux.pl -h 192.
+168.1.150 -c 1" from terminal.And I want to mention it that this host
+ is up and running with in our network.
my (@values1,@val1,@values2,@val2,@values3,@values4,@values5); 
 while (<CMD>) {
#In below, if-block I am extracting the host-ip,Packet Size,Packet+Hea
+der Size from the output line 
#PING 192.168.1.150 (192.168.1.150) 56(84) bytes of data

        if ( $_ =~ /PING/ ){
           @values1 = split ;
          @val1 = split(/\(/,$values1[3]); 
         $val1[1] =~ s/\)//;
           }  
#Below if-block has been used to extract the TTL values from the line 
+"64 bytes from 192.168.1.150: icmp_req=1 ttl=254 time=4.43 ms"
#which is 254
    
      if ($. == 2) {
        @values2 = split;
          @val2 = split(/\=/ , $values2[5]);
           }
#in this if-block I am extracting the transfer-recieved packets and pa
+cket loss ,from the output line "3 packets transmitted, 3 received, 0
+% packet loss, time 2003ms"
      if ($_ =~ /packets/) {
          #print "$_ ";
         @values3 = split;
          }
#In last if-block I am extracting the rtt avg/max/min/med values ,from
+ the output-line "rtt min/avg/max/mdev = 2.113/2.895/4.434/1.089 ms"
      if ($_ =~ /^rtt/) {
           #print "$_ ";
        @values4 = split /\=/;
         @values5 = split(/\// ,$values4[1]);
        }
   }



#print "$values1[1] \n";
 #   print "$val1[0] \n";
 #print "$val1[1] \n";
#print "$val2[1] \n";
#print "$values3[0] \n";
#print "$values3[3] \n";
#print "$values3[5] \n";
#print "$values4[1]";
#my $min = trim($values5[0]); 
#print "$min\n";
#print "$values5[1] \n";
#print "$values5[2] \n";
#print "$values5[3] ";

close CMD
[download]

So its working fine

Now when I passed an IP which is not present in our company network say

 ping 192.168.1.10 -c 1
PING 192.168.1.10 (192.168.1.10) 56(84) bytes of data.

--- 192.168.1.10 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms
[download]

So How can I relay a message by using perl that host is not present in our network?

But if it's present in our company's network but system is down.Say,

#ping 192.168.1.25  -c 1
PING 192.168.1.25 (192.168.1.25) 56(84) bytes of data.
From 192.168.1.23 icmp_seq=1 Destination Host Unreachable

--- 192.168.1.25 ping statistics ---
1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0
+ms
[download]

for this I have to say system is down.Remember here one thing that I am using this perl script on Fedora-14 Redhat Linux System