Active2 months ago
Currently all the solution mentioned for getting the MAC address always use eth0.But what if instead of eth0 my interfaces start with eth1. Also on OS X the interface names are different.
Also the interface eth0 may be present but is unused. i.e. not active, it doesn't have an IP.
Also the interface eth0 may be present but is unused. i.e. not active, it doesn't have an IP.
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So is there a way I could get the MAC address for the first available interface that is Active.(i.e. it has an inet address, I even don't want one having inet6).
For E.g
NOTE : I have changed the values of the output.
So in this case I want the HWaddr for eth1 and not eth0.How do I find it ? Also it should work on all the Linux flavours.
PrathamPratham7621 gold badge9 silver badges23 bronze badges
11 Answers
![Get mac address on ubuntu Get mac address on ubuntu](/uploads/1/2/6/0/126024047/878693063.png)
Observe that the interface name and the MAC address are the first and last fields on a line with no leading whitespace.
If one of the indented lines contains
inet addr:
the latest interface name and MAC address should be printed.Note that multiple interfaces could meet your criteria. Then, the script will print multiple lines. (You can add
tripleeetripleee; exit
just before the final closing brace if you always only want to print the first match.)105k15 gold badges153 silver badges205 bronze badges
You can do as follows
Also you can get MAC for all interface as follows
For particular interface like for eth0
Jayesh BhoiJayesh Bhoi14.7k7 gold badges42 silver badges62 bronze badges
The best Linux-specific solution is to use sysfs:
This method is extremely clean compared to the others and spawns no additional processes since
read
is a builtin command for POSIX shells, including non-BASH shells. However, if you need portability to OS X, then you'll have to use ifconfig
and sed
methods, since OS X does not have a virtual filesystem interface like sysfs.DaveDave
return: eth0 (my online interface)
return: ec:a8:6b:bd:55:05 (macaddress of the eth0, my online interface)
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Elismar LuzElismar Luz
On a modern GNU/Linux system you can see the available network interfaces listing the content of
/sys/class/net/
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![Printable Printable](/uploads/1/2/6/0/126024047/242930382.jpg)
You can check if an interface is
up
looking at operstate
in the device directory. For example, here's how you can see if enp0s25
is up:You can then get the MAC address of that interface with:
For example, here's a simple bash script that prints MAC addresses for active interfaces:
And here's its output on a system with an ethernet and a wifi interface:
For details see the Kernel documentation
Remember also that from 2015 most GNU/Linux distributions switched to
systemd
, and don't use ethX
interface naming scheme any more - now they use a more robust naming convention based on the hardware topology, see:gerlosgerlos
oh, if you want only the mac ether mac address, you can use that:
![Interface Interface](/uploads/1/2/6/0/126024047/237848020.png)
(work on macintosh)
ifconfig
-- get all infogrep
-- keep the line with addresstr
-- clean allcut
-- remove the 'ether' to have only the address
105k15 gold badges153 silver badges205 bronze badges
MajorTomMajorTom
Simply run:
OR
These two example commands will grep all lines with 'ether' string and cut the mac address (that we need) following the number spaces (specified in the -f option) of the grepped portion.
Tested on different Linux flavors
Ibrahim AlMahfoozIbrahim AlMahfooz
I know that is a little bit dated, but with basic commands, we can take the mac address of an interface:
Have a nice day!
MurdokMurdok
None of the above worked for me because my devices are in a balance-rr bond. Querying either would say the same MAC address with
ip l l
, ifconfig
, or /sys/class/net/${device}/address
, so one of them is correct, and one is unknown.But this works if you haven't renamed the device (any tips on what I missed?):
And this works even if you rename it (eg.
ip l set name x0 dev p4p1
):or my ugly script that makes it more parsable (untested driver/os/whatever compatibility):
PeterPeter1,6121 gold badge11 silver badges17 bronze badges
Here's an alternative answer in case the ones listed above don't work for you. You can use the following solution(s) as well, which was found here:
OR
OR
All three of these will show your MAC address(es) next to
link/ether
. I stumbled on this because I had just done a fresh install of Debian 9.5 from a USB stick without internet access, so I could only do a very minimal install, and received when I tried some of the above solutions. I figured somebody else may come across this problem as well. Hope it helps.
sk8forethersk8forether
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Active1 year, 7 months ago
In Ubuntu, with command
ifconfig -a
, I obtain all the information about my ethernet/wifi interfaces.But I need to obtain as output only the MAC address, like:
How can I obtain this?
simone_s1994simone_s1994
5 Answers
The easiest way would be to use
grep
with PCRE:grep -P
will enable us to useperl
compatible Regexgrep -o
will only take the matched portion of the line- We have matched
HWaddr
before our desired match (MAC addresses) and then discardHWaddr
byK
to print only the MAC addresses.
@Helio has mentioned an important point, this is highly dependent on your language i.e.
heemaylheemayllocale
settings. To overcome that you can use the C
locale (uses ASCII character set) for this command only:71.1k11 gold badges153 silver badges222 bronze badges
You can access the
address
file for each device on the /sys
virtual filesystem. The MAC address should be in /sys/class/net/<device-name>/address
:For all devices:
Tim21.1k17 gold badges92 silver badges148 bronze badges
murumuru
Here are a few ways:
grep
. There are various regular expressions that will pick these up. Here, I am looking for 5 repetitions of 2 letters or numbers followed by a colon, then any two characters. The-i
makes the match case insensitive and the-o
makesgrep
print only the matched portion.-E
enables extended regular expressions. The same regex also works with PCREs (-P
).sed
. The-n
suppresses normal output and the-r
enables extended regular expressions. Using the same regex as above, this script will attempt to replace everything on the line with the part of it that matches the regex. If the substitution was successful, the resulting line is printed (because of thep
at the end of the substitution).awk
. If the line starts with a word character ([a-zA-Z0-9_]
), and has 5 fields, print the last one.- Perl, where, as usual, there are more than one ways to do it. This one is the same logic as the
awk
above. The-a
tells perl to split each input line into the@F
array.Alternatively, you can use the regex from the previous approaches: - Coreutils.
74.7k14 gold badges151 silver badges235 bronze badges
As some have commented,
ifconfig
is deprecated in favor of the ip
command. So combining the various solutions and comments, I'd use:user352726user352726
ifconfig -a | grep HWaddr | awk '{print $5}'
If your system output is non-English in this command, then it makes sense to run it this way.
Ubuntu Get Mac Address Command
LANG=C ifconfig -a | grep HWaddr | awk '{print $5}'
Ubuntu Server Get Mac Address
This is applicable to all solutions.
Pilot6Pilot657.2k17 gold badges119 silver badges208 bronze badges