Some behaviors of nslookup may be modified by the contents of resolv. The Linux version of nslookup was written by Andrew Cherenson. When no arguments are given, then the command queries the default server. The - minus sign invokes subcommands which are specified on the command line and should precede nslookup commands.
- Bash Shell Command to Find or Get IP address - nixCraft?
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In non-interactive mode, i. The non interactive mode searches the information for a specified host using the default name server. From Wikipedia, the free encyclopedia. Retrieved Retrieved 20 July Unix command-line interface programs and shell builtins. Windows command-line programs and shell builtins. List of DOS commands Environment variables. Yes, the local IP, first of them as it can have more than one, but I could live even with a list. For the moment I am happy to support only IPv4 addresses and ignore the IPv6, as want it only to generate a hash.
How do you define "primary"? If you're thinking "the IP address that's on the same subnet as my default route", you'll need to program a bit for that. Try curl -4 ifconfig. It will answer with your external IP4 address. Use grep to filter IP address from ifconfig : ifconfig grep -Eo 'inet addr:? Artem Russakovskii Chris Seymour Chris Seymour Recent versions of FreeBSD have added the -r option as an alias for -E to ease script portability, but the update hasn't yet been brought over to OSX, which last I checked still uses a version of sed from a FreeBSD release of a few years ago.
I believe the use of -E was intended to be comparable to grep 's -E option. No idea why GNU folks opted for -r instead. It seems that the first one is the right one but still this would break my logic. See gist. For linux machines not OS X : hostname --ip-address. ACyclic ACyclic 3, 1 1 gold badge 20 20 silver badges 26 26 bronze badges. That only works if the name is in DNS. If not, you get the message "hostname: Name or service not known. This will sometimes simply return If available, better use hostname -I as recommended by the manual Ubuntu : "--ip-address Display the network address es of the host name.
Note that this works only if the host name can be resolved. Avoid using this option; use hostname --all-ip-addresses instead. The following will work on Linux but not OSX.
Rob Bednark Collin Anderson Collin Anderson The method that gets the first address produced by the hostname -I is unreliable, because according to the documentation one cannot make any assumptions about the order of the addresses. So it may well be some internal network like the network on which virtual machines are living. The other method seems good. This should be the accepted answer as RHEL 7 no longer includes ifconfig.
It is important to read the IP specifically from the interface associated with the default route. Otherwise you are quite likely to get some worthless internal address. Edited For stronger config, with many interfaces and many IP configured on each interfaces, I wrote a pure bash script not based on Older version of this answer Not deleted because based on sed , not bash. Warn: There is an issue about locales!
Bash Shell Command to Find or Get IP address
This seem not work on Mac OS The last two lines just print, something like: Interface : en0 Local Ip : Hauri F. Hauri Hauri Nov 10 '12 at Newer solutions give me syntax errors. Compatibility is always a plus. Thank you. Boris Boris 2, 2 2 gold badges 23 23 silver badges 38 38 bronze badges. Issues I found with preceding answers: use of positional column in command output; use of ifconfig which is deprecated and -- for example -- don't list multple IPs; use of awk for a simple task which sed can handle better; ip route get 1 is unclear, and is actually an alias for ip route get to 1.
Sathish Sathish 2, 3 3 gold badges 19 19 silver badges 27 27 bronze badges. The best answer to me! Thanks Sathish! I agree, this is the cleanest method to get eth0's IPv4. This assumes eth0, which is not current naming strategy and never was guaranteed to be the primary interface.
bash - How to get the primary IP address of the local machine on Linux and OS X? - Stack Overflow
Specific to only certain builds of Ubuntu. Though it may just tell you Eric Leschinski Mar 21 '18 at Colin Fletcher Colin Fletcher 1 1 silver badge 2 2 bronze badges.
Despite all the answers to this question, this one appears to be the only one that comes close to actually being correct. Just needs a head -1 at the end of the first line to get the default interface, and the rest is good. Kjeld Flarup Kjeld Flarup 2 2 silver badges 9 9 bronze badges. Suppose to work even if you don't have internet? Faizan Noor Faizan Noor 9 9 silver badges 10 10 bronze badges. But the question initially was about the command.
So I just posted relevantly. Gottlieb Notschnabel 5, 16 16 gold badges 57 57 silver badges bronze badges. The man page tells you specifically not to make any assumptions about the order of the output.
Works great for my trivial use cases — I don't care if it is quick and dirty! Taco Bell programming at it's best -- thanks for this.
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