How do I display all available network interfaces on linux?

How do I display all available network interfaces names under Linux operating systems using bash shell prompt?

You can use the following commands to see all network interfaces under Linux operating systems:

Method 1:

Using ip command

Syntax: ip link show

Example:

root@linuxforfreshers.com:~$ ip link show

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000

    link/ether 00:1b:78:8b:33:c4 brd ff:ff:ff:ff:ff:ff

3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000

    link/ether 46:41:6e:87:64:74 brd ff:ff:ff:ff:ff:ff

Where

1.    lo – Loopback interface.

2.    eth0 – First Ethernet network interface.

3.     vboxnet0, vmnet1, vmnet8 – Virtual machine interface working in bridge mode or NAT mode. 

Method 2:

Using ifconfig

Syntax: ifconfig

Example:

root@linuxforfreshers.com:~$ ifconfig

eth0      Link encap:Ethernet  HWaddr 00:1b:78:8b:39:d5 

          inet addr:192.168.101.26Bcast:192.1.16.255  Mask:255.255.255.0

          inet6 addr: fe80::21b:78ff:fe8b:33c4/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:1881405 errors:0 dropped:0 overruns:0 frame:0

          TX packets:841660 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:1234319479 (1.2 GB)  TX bytes:157758923 (157.7 MB)

          Interrupt:19 Memory:f2400000-f2420000

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:65536  Metric:1

          RX packets:148 errors:0 dropped:0 overruns:0 frame:0

          TX packets:148 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1

          RX bytes:21549 (21.5 KB)  TX bytes:21549 (21.5 KB)

virbr0    Link encap:Ethernet  HWaddr 46:41:6e:87:64:74 

          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0

          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)

Example 2:

root@linuxforfreshers.com:~$ ifconfig -a | sed 's/[ \t].*//;/^$/d'

eth0

lo

virbr0

Method 3:

Usinf sys.

Example:

root@linuxforfreshers.com:~$ ls /sys/class/net/

eth0  lo  virbr0

 Method 4:

Using basename

Example :

root@linuxforfreshers.com:~$ basename -a /sys/class/net/*

eth0

lo

virbr0