Viewing information about network connections and devices is easy with the netstat -a command. The -i parameter allows you to view the information about your network adapters, the transmitted and received packets and the number of transmitted and dropped packets.
flynn@ubuntu:~$ netstat -i Kernel Interface table Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg eth0 1500 0 160634 0 0 0 96978 0 0 0 BMRU lo 16436 0 32 0 0 0 32 0 0 0 LRU |
The exiv2 command for Linux will allow you to examine a jpeg file from the Internet and see if the EXIF data is intact. This can be useful when you want more information that is embedded in the image.
C:\HOME\FLYNN\DESKTOP> exiv2 IMG-20120704-00013.jpg File name : IMG-20120704-00013.jpg File size : 639751 Bytes MIME type : image/jpeg Image size : 2048 x 1536 Camera make : Research In Motion Camera model : BlackBerry 9700 Image timestamp : 2012:07:04 09:37:48 Image number : Exposure time : 0 s Aperture : Exposure bias : Flash : No flash function Flash bias : Focal length : Subject distance: Unknown ISO speed : Exposure mode : Metering mode : Macro mode : Image quality : Exif Resolution : 2048 x 1536 White balance : Thumbnail : None Copyright : Exif comment : |
The sudo tcpdump command will allow you to monitor a network interface and see the network packets travelling to and fro. I had a Firefox instance open when I ran this and therefore that activity is visible in the output.
C:\HOME\FLYNN> sudo tcpdump -i eth0 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 19:28:27.038597 IP 192.168.1.2.58325 > 192.168.1.1.domain: 8614+ A? www.securitronlinux.com. (41) 19:28:27.039384 IP 192.168.1.1.domain > 192.168.1.2.58325: 8614- 1/0/0 A 199.27.135.56 (57) 19:28:27.039465 IP 192.168.1.2.48756 > 192.168.1.1.domain: 1867+ PTR? 1.1.168.192.in-addr.arpa. (42) 19:28:27.039579 IP 192.168.1.2.50792 > cf-199-27-135-56.cloudflare.com.http: Flags [S], seq 1882545439, win 14600, options [mss 1460,sackOK,TS val 10369150 ecr 0,nop,wscale 7], length 0 19:28:27.103922 IP 192.168.1.1.domain > 192.168.1.2.48756: 1867 NXDomain* 0/1/0 (92) 19:28:27.104435 IP 192.168.1.2.54073 > 192.168.1.1.domain: 13432+ PTR? 2.1.168.192.in-addr.arpa. (42) 19:28:27.151064 IP 192.168.1.1.domain > 192.168.1.2.54073: 13432 NXDomain* 0/1/0 (92) 19:28:27.151465 IP 192.168.1.2.59936 > 192.168.1.1.domain: 16556+ PTR? 56.135.27.199.in-addr.arpa. (44) 19:28:27.289753 IP 192.168.1.2.41114 > 192.168.1.1.domain: 52365+ A? www.securitronlinux.com. (41) 19:28:27.310924 IP cf-199-27-135-56.cloudflare.com.http > 192.168.1.2.50792: Flags [S.], seq 128165367, ack 1882545440, win 4344, options [mss 1452,sackOK,TS val 55290998 ecr 10369150,nop,wscale 10], length 0 19:28:27.310967 IP 192.168.1.2.50792 > cf-199-27-135-56.cloudflare.com.http: Flags [.], ack 1, win 115, options [nop,nop,TS val 10369218 ecr 55290998], length 0 19:28:27.311100 IP 192.168.1.2.50792 > cf-199-27-135-56.cloudflare.com.http: Flags [.], seq 1:1441, ack 1, win 115, options [nop,nop,TS val 10369218 ecr 55290998], length 1440 19:28:27.311110 IP 192.168.1.2.50792 > cf-199-27-135-56.cloudflare.com.http: Flags [P.], seq 1441:2881, ack 1, win 115, options [nop,nop,TS val 10369218 ecr 55290998], length 1440 19:28:27.311116 IP 192.168.1.2.50792 > cf-199-27-135-56.cloudflare.com.http: Flags [P.], seq 2881:3442, ack 1, win 115, options [nop,nop,TS val 10369218 ecr 55290998], length 561 19:28:27.602359 IP cf-199-27-135-56.cloudflare.com.http > 192.168.1.2.50792: Flags [.], ack 1441, win 8, options [nop,nop,TS val 55291027 ecr 10369218], length 0 19:28:27.622609 IP cf-199-27-135-56.cloudflare.com.http > 192.168.1.2.50792: Flags [.], ack 2881, win 10, options [nop,nop,TS val 55291029 ecr 10369218], length 0 19:28:27.640085 IP cf-199-27-135-56.cloudflare.com.http > 192.168.1.2.50792: Flags [.], ack 3442, win 13, options [nop,nop,TS val 55291030 ecr 10369218], length 0 19:28:27.665380 IP 192.168.1.1.domain > 192.168.1.2.59936: 16556 1/2/0 PTR cf-199-27-135-56.cloudflare.com. (125) 19:28:27.863628 IP 192.168.1.1.domain > 192.168.1.2.41114: 52365 4/2/0 CNAME www.securitronlinux.com.cdn.cloudflare.net., CNAME cf-protected-www.securitronlinux.com.cdn.cloudflare.net., A 173.245.61.146, A 199.27.135.56 (212) 19:28:27.863896 IP 192.168.1.2.33402 > 192.168.1.1.domain: 32490+ A? www.securitronlinux.com. (41) 19:28:27.864606 IP 192.168.1.1.domain > 192.168.1.2.33402: 32490- 1/0/0 A 173.245.61.146 (57) 19:28:27.864819 IP 192.168.1.2.33633 > www.securitronlinux.com.http: Flags [S], seq 684488925, win 14600, options [mss 1460,sackOK,TS val 10369357 ecr 0,nop,wscale 7], length 0 19:28:27.864945 IP 192.168.1.2.54147 > 192.168.1.1.domain: 17006+ PTR? 146.61.245.173.in-addr.arpa. (45) 19:28:27.883139 IP 192.168.1.1.domain > 192.168.1.2.54147: 17006- 1/0/0 PTR www.securitronlinux.com. (82) 19:28:28.134104 IP www.securitronlinux.com.http > 192.168.1.2.33633: Flags [S.], seq 147856110, ack 684488926, win 4344, options [mss 1452,sackOK,TS val 55310751 ecr 10369357,nop,wscale 10], length 0 19:28:28.134153 IP 192.168.1.2.33633 > www.securitronlinux.com.http: Flags [.], ack 1, win 115, options [nop,nop,TS val 10369424 ecr 55310751], length 0 19:28:29.007771 IP cf-199-27-135-56.cloudflare.com.http > 192.168.1.2.50792: Flags [P.], seq 1:574, ack 3442, win 13, options [nop,nop,TS val 55291168 ecr 10369218], length 573 19:28:29.007817 IP 192.168.1.2.50792 > cf-199-27-135-56.cloudflare.com.http: Flags [.], ack 574, win 124, options [nop,nop,TS val 10369642 ecr 55291168], length 0 19:28:29.025272 IP cf-199-27-135-56.cloudflare.com.http > 192.168.1.2.50792: Flags [P.], seq 574:594, ack 3442, win 13, options [nop,nop,TS val 55291168 ecr 10369218], length 20 19:28:29.025303 IP 192.168.1.2.50792 > cf-199-27-135-56.cloudflare.com.http: Flags [.], ack 594, win 124, options [nop,nop,TS val 10369647 ecr 55291168], length 0 19:28:29.951684 ARP, Request who-has 192.168.1.1 (Broadcast) tell 192.168.1.3, length 46 19:28:29.951921 IP 192.168.1.2.47676 > 192.168.1.1.domain: 62316+ PTR? 3.1.168.192.in-addr.arpa. (42) 19:28:30.000463 IP 192.168.1.1.domain > 192.168.1.2.47676: 62316 NXDomain* 0/1/0 (92) 19:28:33.134561 IP 192.168.1.2.33633 > www.securitronlinux.com.http: Flags [F.], seq 1, ack 1, win 115, options [nop,nop,TS val 10370674 ecr 55310751], length 0 19:28:33.367159 IP www.securitronlinux.com.http > 192.168.1.2.33633: Flags [F.], seq 1, ack 2, win 5, options [nop,nop,TS val 55311274 ecr 10370674], length 0 19:28:33.367204 IP 192.168.1.2.33633 > www.securitronlinux.com.http: Flags [.], ack 2, win 115, options [nop,nop,TS val 10370732 ecr 55311274], length 0 |
A good way to view a listing of the block devices/partitions on your system is with the lsblk command. This gives a very nice tree view listing.
C:\HOME\FLYNN> lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 465.8G 0 disk ├─sda1 8:1 0 430M 0 part /media/e01436e0-4aa5-420b-94aa-0b35bd00020e ├─sda2 8:2 0 341.8G 0 part / ├─sda3 8:3 0 121.1G 0 part /media/a6f66737-afea-48c3-9694-f6da22904d37 ├─sda4 8:4 0 1K 0 part └─sda5 8:5 0 2.5G 0 part [SWAP] sdb 8:16 0 465.8G 0 disk ├─sdb1 8:17 0 214.9G 0 part /media/My Ubuntu ├─sdb2 8:18 0 32.2G 0 part /media/3fabc97d-c76a-4922-8705-5536e89cfd21 ├─sdb3 8:19 0 1K 0 part └─sdb5 8:21 0 218.6G 0 part /media/52d826a6-7de5-45db-b693-dd7c7e82af37 sdc 8:32 0 1.8T 0 disk └─sdc1 8:33 0 1.8T 0 part /media/Elements sr0 11:0 1 2K 0 rom |