Tech Tip: Getting Your MAC and IP Address In a Script

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Ever wanted to get the MAC or IP address of your computer in a Linux shell script? The following two commands should work on most flavours of Linux/Unix.

To get your IP address:

/sbin/ifconfig \
   | grep '\<inet\>' \
   | sed -n '1p' \
   | tr -s ' ' \
   | cut -d ' ' -f3 \
   | cut -d ':' -f2

To get your MAC address (Hardware address):

/sbin/ifconfig \
   | grep 'eth0' \
   | tr -s ' ' \
   | cut -d ' ' -f5

Note that this retrieves the address of the eth0 interface by default.

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How about this: hostname -i

Anonymous's picture

How about this:

hostname -i

this one-liner shows all IP addresses for all interfaces

freephile's picture

/sbin/ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | sort | awk '{print "# "$1}'

get your IP

kaloyan's picture

ifconfig eth0
| sed -n '/inet addr:/p'
| cut -d: -f2
| cut -d" " -f1

all in one

Anonymous's picture

ifconfig ath0 | perl -ne 'm/.*HWaddr (\S+).*/ && print "$1 ";m/.*inet addr:(\S+)/ && print "$1\n"'

Perl could be used for extracting both IPv4 and IPv6:

Roland Müller's picture
# ifconfig | perl -ne '(s|^\s+inet6\s+addr:\s*([0-9a-f:/]+)\s+.*|${1}| or s|^\s+inet\s+addr:\s*([0-9.]+)\s+.*|${1}|) and print;'
******************************
******************************
127.0.0.1
::1/128

showing mac address

Joe Eykholt's picture

To show MAC:

cat /sys/class/net/eth0/address

egrep

Kwirkie's picture

How about...

IP:
ifconfig eth1 | egrep -o '([0-9]{1,3}\.){3}[0-9]{1,3}' | sed -n '1p'

MAC:
ifconfig eth1 | egrep -o '([[:xdigit:]]{2}[:]){5}[[:xdigit:]]{2}'

This provides validation and also the regexp can be used elsewhere to find IPs and MACs

IP: ip addr show dev eth0 |

zsteva's picture

IP:
ip addr show dev eth0 | sed -e's/^.*inet \([^ ]*\)\/.*$/\1/;t;d'

MAC:
ip addr show dev eth0 | sed -e's/^.*link[^ ]* \([^ ]*\) .*$/\1/;t;d'

or with /sbin/ifconfig

IP:
/sbin/ifconfig wlan0 | sed -e's/^.*inet addr:\([^ ]*\) .*$/\1/;t;d'

MAC:
/sbin/ifconfig eth0 | sed -e's/^.*HWaddr \([^ ]*\) .*$/\1/;t;d'

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