Hi guys,
I was trying to pipe two perl scripts
I have a data provider and a data process scritp.
First the data provider is
dhcp_line_dispacher.pl
#!/usr/bin/perl -w
use strict;
use File::Tail;

my $file = File::Tail->new(
        name =>'/var/log/messages', 
        interval => 1, 
        maxinterval => 1, 
#        resetafter=> 5, 
        );

while (defined(my $line=$file->read)) {
 
    print $line;

}

[download]
and , line_process.pl is:
#!/usr/bin/perl -w
use strict;
use Net::Ping;
my $result;

while (<>){

                my $p = Net::Ping->new('icmp',3);

                if ($_ =~ /^(.*) dns02cor dhcpd: DHCPACK on ([0-9\.]+)
+ to ([[:xdigit:]:]+).* ([0-9\.]+)/) {

                                for (my $i = 0; $i < 3; $i++){
                                        print "attempt $i for $2 \n";
                                        $result = $p->ping($2);
                                                if ($result){
                                                print "############## 
+$2 is alive at attempt $i\n";
                                                last;
                                                }
                                $p->close();
                                }
                                unless ($result){
                                         print "*****$2 is dead*****\n
+";
                                }
                }

}

[download]
When I run them individually they work ok, but when I try to pipe them doing:
./dhcp_line_dispacher.pl | ./line_process.pl
Nothing happens.
So I test the ./dhcp_line_dispacher.pl and realized than I can`t grab the output.
For example from cli, I do:
./dhcp_line_dispacher.pl | grep ACK And can not get the output in real time.
What should I do to get the output and then process it in other script?
regards,
Leo.

In reply to pipe issue (linux) by leostereo

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