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Linux Check IP Address or MAC Address

Linux good old command to check IP Address is  ifconfig which works probably in all distro.

There is already new implementation on how to check the IP Address via command line from some distro.

Some distro now supports the command, ip addr show which also displays the IP Address.

The ifconfig command has a long output, which is quite scary if you are new to Linux.

To filter the desired output in ifconfig, awk or gawk will come to the rescue.

Below are some examples on how to do it:

Display only the IP Address:

ifconfig -a | awk 'NR==2'

Sample Output:
inet addr: Bcast: Mask:

Display only the MAC Address:

ifconfig -a | awk 'NR==1'

Sample Output:
eth0  Link encap:Ethernet  HWaddr 07:00:16:f1:bb:ac
HWaddr is the MAC Address

Display both IP and MAC Address:

ifconfig -a | awk 'NR==1,NR==2'

Using awk command ifconfig output is displayed line by line.

Some other useful command below to check users login in Linux.

last /var/log/wtmp
last /var/run/utmp

users /var/run/utmp
users /var/log/wtmp

Cheers! Till next time. Enjoy Linux!!!


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