I\'m trying to use just the IP address (inet) as a parameter in a script I wrote.
Is there an easy way in a unix terminal to get just the IP address, rather than loo
I wanted something simple that worked as a Bash alias. I found that hostname -I
works best for me (hostname v3.15). hostname -i
returns the loopback IP, for some reason, but hostname -I
gives me the correct IP for wlan0, and without having to pipe output through grep or awk. A drawback is that hostname -I
will output all IPs, if you have more than one.
Command ifconfig
is deprected and you should use ip
command on Linux.
Also ip a
will give you scope on the same line as IP so it's easier to use.
This command will show you your global (external) IP:
ip a | grep "scope global" | grep -Po '(?<=inet )[\d.]+'
All IPv4 (also 127.0.0.1):
ip a | grep "scope" | grep -Po '(?<=inet )[\d.]+'
All IPv6 (also ::1):
ip a | grep "scope" | grep -Po '(?<=inet6 )[\da-z:]+'
On latest Ubuntu versions (14.04 - 16.04), this command did the trick for me.
hostname -I | awk '{print $1}'
We can simply use only 2 commands ( ifconfig + awk ) to get just the IP (v4) we want like so:
On Linux, assuming to get IP address from eth0
interface, run the following command:
/sbin/ifconfig eth0 | awk '/inet addr/{print substr($2,6)}'
On OSX, assumming to get IP affffdress from en0
interface, run the following command:
/sbin/ifconfig en0 | awk '/inet /{print $2}'
To know our public/external IP, add this function in ~/.bashrc
whatismyip () {
curl -s "http://api.duckduckgo.com/?q=ip&format=json" | jq '.Answer' | grep --color=auto -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b"
}
Then run, whatismyip
That would do the trick in a Mac :
ping $(ifconfig en0 | awk '$1 == "inet" {print $2}')
That resolved to ping 192.168.1.2
in my machine.
Pro tip: $(...)
means run whatever is inside the parentheses in a subshell and return that as the value.
You can write a script that only return the IP like:
/sbin/ifconfig eth0 | grep 'inet addr' | cut -d: -f2 | awk '{print $1}'
For MAC:
ifconfig | grep "inet " | grep -v 127.0.0.1 | cut -d\ -f2
Or for linux system
hostname -i | awk '{print $3}' # Ubuntu
hostname -i # Debian