Listing All Network Devices on Linux: ifconfig vs "ip addr" in iproute2

To list all the networking interfaces on Linux, don't use ifconfig because it's deprecated, use ip addr instead. Ip addr is found in a utilities collection called iproute2.  The wiki link points to where to download iproute2 source code, which was last updated on March 17, 2011 as I write this. I also finally found ifconfig's source code (in C) from net-tools. Note that its last update was in 2001, a decade ago!

ifconfig

eth0      Link encap:Ethernet  HWaddr 00:21:70:92:5b:c5
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:17

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:20236 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20236 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3259142 (3.2 MB)  TX bytes:3259142 (3.2 MB)

vmnet1    Link encap:Ethernet  HWaddr 00:50:56:c0:00:01
          inet addr:172.16.76.1  Bcast:172.16.76.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fec0:1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2461 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

vmnet8    Link encap:Ethernet  HWaddr 00:50:56:c0:00:08
          inet addr:172.16.197.1  Bcast:172.16.197.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fec0:8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2461 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

wlan0     Link encap:Ethernet  HWaddr 00:1c:26:64:0f:ac
          inet addr:18.111.100.150  Bcast:18.111.127.255  Mask:255.255.224.0
          inet6 addr: fe80::21c:26ff:fe64:fac/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:191734 errors:0 dropped:0 overruns:0 frame:0
          TX packets:156739 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:224807742 (224.8 MB)  TX bytes:28859347 (28.8 MB)

See, they both give the same list!

ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
    link/ether 00:21:70:92:5b:c5 brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:1c:26:64:0f:ac brd ff:ff:ff:ff:ff:ff
    inet 18.111.100.150/19 brd 18.111.127.255 scope global wlan0
    inet6 fe80::21c:26ff:fe64:fac/64 scope link
       valid_lft forever preferred_lft forever
4: vmnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:50:56:c0:00:01 brd ff:ff:ff:ff:ff:ff
    inet 172.16.76.1/24 brd 172.16.76.255 scope global vmnet1
    inet6 fe80::250:56ff:fec0:1/64 scope link
       valid_lft forever preferred_lft forever
5: vmnet8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:50:56:c0:00:08 brd ff:ff:ff:ff:ff:ff
    inet 172.16.197.1/24 brd 172.16.197.255 scope global vmnet8
    inet6 fe80::250:56ff:fec0:8/64 scope link
       valid_lft forever preferred_lft forever

Net-tools-1.60's "ifconfig.c" file has about 1100 lines of code.
Iproute2-2.6.38/ip/ipaddress.c file has about 1200 lines of code.