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I trying to find the command-line solution that would return me a primary (first) IP address of the localhost, other than

This solution should work for Linux (Debian and RedHat) and OS X 10.7+

I knew that the ifconfig is available on both but its output is not so consistent between these platforms.

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Use the grep to filter your IP address from ifconfig:

ifconfig | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v ''

Or with the help of sed:

ifconfig | sed -En 's/;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p'

If you are interested only in certain interfaces, wlan0, eth0, etc. then:

ifconfig wlan0 | ...

You can alias your command in the .bashrc to create your own command called myip for instance.

alias myip="ifconfig | sed -En 's/;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p'"

The simpler way is the hostname -I (hostname -i for older versions of hostname but see comments). However, this is on Linux only.

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