Shell Programming and Scripting

netstat | awk  '/server/ {for(i=1;i<2;i++) {getline;print}' 
 
Output:
ESTABLISHED
ESTABLISHED
ESTABLISHED
ESTABLISHED
ESTABLISHED
TIME_WAIT
TIME_WAIT

=====================================
host                    total   FIN_WAIT2 ESTABLISHED
192.168.1.115   |           1           0           1
192.168.1.32    |           1           0           1
86.8.240.6      |           7           6           1
total           |           9           6           3

#!/usr//bin/perl 

use strict;
my ($Proto, $Recv, $Send, $Local, $Foreign, $State);
my ($local, $foreign, $f_port, $l_port);
my $db = {};
my @STATES;
my $stats = {};
our $verbose = 1;


open NETSTAT,  "netstat -nt |" or die "netstat:$!\n"; 

my $headers = my $h = 2;
<NETSTAT> while ($h--);

LOOP:
while (<NETSTAT>) {

    ($Proto, $Recv, $Send, $Local, $Foreign, $State) = split;

    foreach my $grep (@ARGV) {
        next LOOP unless /$grep/;
    }

    print if $verbose ;

    ($foreign, $f_port) = split ':', $Foreign;
    ($local, $l_port) = split ':', $Local;

    $stats->{$State}++;

    $db->{$foreign}->{connections}++ ;
    $db->{$foreign}->{states}->{$State}++;
    $db->{total}->{connections}++ ;
    $db->{total}->{states}->{$State}++;
}

@STATES = (keys %$stats);
printf "=====================================\n";
printf "%-16s %12s", "host", "total";
map { printf "%12s", $_ } @STATES;
print "\n";

foreach my $h (sort keys %$db) {
    printf "%-16s|", $h;
    printf "%12d",  $db->{$h}->{connections};
    foreach my $s (@STATES) {
        my $state = $db->{$h}->{states}->{$s} +  0; 
        printf "%12d",  $state;
    }
    print "\n";

}

netstat -antu | awk '/LISTEN|ESTABLISHED|TIME_WAIT/{a[$6]++}; END { for(b in a) print "Count of "b" is: "a[b]}'

netstat -a

tcp 0 0 server1.00000 server2.00000 ESTABLISHED

netstat -a | grep server1 |  awk '/LISTEN|ESTABLISHED|TIME_WAIT/{a[$6]++}; END { for(b in a) print "Count of "b" is: "a[b]}' 
 
Count of LISTEN is:2
Count of ESTABLISHED is: 18
Count of TIME_WAIT is: 5

netstat -a | awk '/server/ && /LISTEN|ESTABLISHED|TIME_WAIT/{a[$6]++}; END { for(b in a) print "Count of "b" is: "a[b]}'