If all you want is the IP of the up and outbound interface, this works. #define AF_INET 2 /* Internet IP Protocol */ The numbers used to index protocols are from /usr/include/linux/socket.h (in Linux). netifaces.AF_INET, and whose values are a list of addresses in\nthat family that are attached to the network interface.' 'Obtain information about the specified network interface.\n\nReturns a dict whose keys are equal to the address family constants,\ne.g. If you insist on using ping and sed, you can do: % ping -c1 | sed -nE 's/^PING+\((+)\).Ip addr | grep 'state UP' -A2 | tail -n1 | awk ' In essence, with my configuration, this will first check /etc/hosts, then mDNS and at last DNS. If youre looking for a private IP address, or for a set of all IP addresses assigned to the box, you could use some combination of ifconfig (on BSD and GNU/Linux), ip addr (on GNU/Linux), hostname (options -i and -I on GNU/Linux) and netstat to see whats going on. In /etc/nf, so getent hosts will query in sequence and use gethostbyaddr(3) or gethostbyname(3) based on name and ahosts will use getaddrinfo(3). In my computer, i have: hosts: files mdns4 dns etc/nsswitch, then use the getent command with hosts (or ahosts) database e.g.: getent hosts Here's a dig output: % dig +short Īs a side note, in Linux, if you want to query by the NSSwitch (Name Service Switch) i.e. You should look at dig, host, nslookup - whatever suites you the best. Ping is for checking whether a host is up or down based on ICMP response, it is never the right tool for only resolving IP address, there are dedicated tools for that. Again, thank you to everyone that tried to help.
I am now using a timer script that I created to configure iptables at certain times to block certain domain name resolutions. I have since refined my methods and do not use any of the answers here but I thank everyone for their attempts with helping here. I have, since asking this question, learned proper POSIX regex to do what I needed and I need to make it clear that I was originally asking about the regular expressions for sed that would print a single instance of an IP from ping output. This is NOT asking to resolve a domain name and therefore is NOT A DUPLICATE!!!
#Bash grep ip address how to#
How to parse the IP ADDRESS "ONLY" from ping OUTPUT when using ping on a domain name. Since some marked this question a duplicate of some other bullshit question that has nothing to do with this one, I will make it clear enough that retards with English comprehension troubles can understand:
#Bash grep ip address portable#
This question is specifically about managing ping output using sed in order to keep the tool I have created more portable as ping comes default with almost any and all linux distros. I already know/knew how to resolve IP address from a host name or domain. How can I remove the duplicate with sed so that I can store the single IP address into a variable and run the script as a cronjob, or am I on a better track using tr? Which gives me an output of: you can see, there is a duplicate of the same IP address. So if I do a ping for Google: ping -c 1 -s 16
I don't want to do this as I believe a single ping will be much more lightweight and portable. to 3:30 P.M.).Īs of currently, the tool works fine, but I have to input IP addresses to certain websites manually into a text file and have the tool pull the IP address based on the nth line using the "head" and "tail" commands. This tool will block certain IP addresses for a certain time range (i.e.
I have crafted a Bash tool that runs on a server.
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