commandline session

$netstat --tcp
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 debian.local:39585      74.125.169.8:http       ESTABLISHED
tcp        0      0 debian.local:39586      74.125.169.8:http       ESTABLISHED
tcp        0      0 debian.local:47951      maa03s17-in-f6.1e:https ESTABLISHED
tcp        0      0 debian.local:47203      maa03s17-in-f0.1e1:http ESTABLISHED
$
$netstat --tcp --numeric
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        1      0 192.168.0.101:54541     46.22.210.18:80         CLOSE_WAIT
tcp        0      0 192.168.0.101:54542     46.22.210.18:80         ESTABLISHED
tcp        0      0 192.168.0.101:39585     74.125.169.8:80         ESTABLISHED
tcp        0      0 192.168.0.101:39586     74.125.169.8:80         TIME_WAIT
tcp        0      0 192.168.0.101:47951     74.125.236.198:443      ESTABLISHED
tcp        0      0 192.168.0.101:47203     74.125.236.192:80       ESTABLISHED
$netstat --tcp --numeric
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 192.168.0.101:54542     46.22.210.18:80         TIME_WAIT
tcp        0      0 192.168.0.101:39585     74.125.169.8:80         ESTABLISHED
tcp        0      0 192.168.0.101:39586     74.125.169.8:80         TIME_WAIT
tcp        0      0 192.168.0.101:47951     74.125.236.198:443      ESTABLISHED
tcp        0      0 192.168.0.101:47203     74.125.236.192:80       ESTABLISHED
$netstat --tcp --listen
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 *:35436                 *:*                     LISTEN
tcp        0      0 *:sunrpc                *:*                     LISTEN
tcp        0      0 *:ssh                   *:*                     LISTEN
tcp        0      0 localhost:smtp          *:*                     LISTEN
tcp6       0      0 [::]:sunrpc             [::]:*                  LISTEN
tcp6       0      0 [::]:501100              [::]:*                  LISTEN
tcp6       0      0 [::]:ssh                [::]:*                  LISTEN
tcp6       0      0 localhost:smtp          [::]:*                  LISTEN
$netstat --tcp --listen
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 *:35436                 *:*                     LISTEN
tcp        0      0 *:sunrpc                *:*                     LISTEN
tcp        0      0 *:ssh                   *:*                     LISTEN
tcp        0      0 localhost:smtp          *:*                     LISTEN
tcp6       0      0 [::]:sunrpc             [::]:*                  LISTEN
tcp6       0      0 [::]:501100              [::]:*                  LISTEN
tcp6       0      0 [::]:ssh                [::]:*                  LISTEN
tcp6       0      0 localhost:smtp          [::]:*                  LISTEN
$netstat --tcp --program
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 debian.local:39600      74.125.169.8:http       ESTABLISHED 3846/chrome
tcp        0      0 debian.local:47951      maa03s17-in-f6.1e:https ESTABLISHED 3846/chrome
tcp        0      0 debian.local:47203      maa03s17-in-f0.1e1:http ESTABLISHED 3846/chrome
$
$netstat --tcp --route
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
default         192.168.0.1     0.0.0.0         UG        0 0          0 eth0
192.168.0.0     *               255.255.255.0   U         0 0          0 eth0
$netstat --tcp --statistics
IcmpMsg:
    OutType3: 1
Tcp:
    522 active connections openings
    0 passive connection openings
    14 failed connection attempts
    16 connection resets received
    2 connections established
    60302 segments received
    41524 segments send out
    22 segments retransmited
    21 bad segments received.
    140 resets sent
UdpLite:
TcpExt:
    190 TCP sockets finished time wait in fast timer
    495 delayed acks sent
    1 delayed acks further delayed because of locked socket
    Quick ack mode was activated 32 times
    47899 packet headers predicted
    1353 acknowledgments not containing data payload received
    406 predicted acknowledgments
    7 congestion windows recovered without slow start after partial ack
    22 other TCP timeouts
    32 DSACKs sent for old packets
    3 DSACKs sent for out of order packets
    5 DSACKs received
    25 connections reset due to unexpected data
    16 connections reset due to early user close
    TCPSackShiftFallback: 2
    TCPChallengeACK: 21
    TCPSYNChallenge: 21
IpExt:
    InMcastPkts: 929
    OutMcastPkts: 42
    InBcastPkts: 16
    OutBcastPkts: 14
    InOctets: 83827635
    OutOctets: 2776707
    InMcastOctets: 332300
    OutMcastOctets: 5264
    InBcastOctets: 1808
    OutBcastOctets: 1006
$

Bash – netstat ( network statistics related ) – Video Tutorial Related

[ source : http://www.youtube.com/user/metalx1000 ]


commandline session

$ > test file
Usage: file [-bchikLlNnprsvz0] [--apple] [--mime-encoding] [--mime-type]
            [-e testname] [-F separator] [-f namefile] [-m magicfiles] file ...
       file -C [-m magicfiles]
       file [--help]
$ls
test
$ls -l
total 0
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  8 23:59 test
$> "test file"
$ls
test  test file
$ls -l
total 0
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  8 23:59 test
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  8 23:59 test file
$> test
test       test file
$> test  newfile
bash: newfile: command not found
$> test newfile
$ls
test  test   test file  test newfile
$ls -l
total 0
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  8 23:59 test
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  9 00:00 test
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  8 23:59 test file
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  9 00:00 test newfile
$> test  newfile
$ls -l
total 0
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  8 23:59 test
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  9 00:00 test
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  8 23:59 test file
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  9 00:00 test newfile
-rw-r--r-- 1 jeffrin jeffrin 0 Nov  9 00:01 test  newfile
$

the following video tutorial content may not be fully accurate


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