The loop keeping counter of 4 iterations accounts for 4 sections of a valid IPv4 address, while acrobatics with named pipes account for need to further use sections of ip address within script as opposed to having variables stuck in a subshell of a loop. Here’s the solution muru alluded to: first=$"Īnd with ip changed to 109.*.*.* $. all the newline separated matches are being passed as a single argument to ping which takes only a single address at a time as argument hence it is failing.
In fact the answer you marked as accepted does just that (just uses ip instead of ifconfig ). Not 1.14.2.90 in xserver-common_1.14.2.901-2_all.Your problem statement may be a bit more liberal than you intended. 1,920 5 21 34 2 Isn't ifconfig -a what you're looking for rusty at 7:43 1 rajcoumar I fail to see why using a private IP prohibits you from using the output of ifconfig -a. Given that the test string contains: $ a='1.2.3.4 Then we just need to repeat the use of the byte definition with a leading dot (\.(?&byte))(?=|$)' <<<"$a"
#BASH GREP IP ADDRESS FULL#
To avoid the repetition of, to use explicit numeric ranges (avoid matching numbers in other languages) and to give a name to each matching group we can use "Named Capture Groups" from PCRE's: (?P # Define this as one full byte value. Remove the first column comments to include leading zeros. We can match one numeric 0-255 value with (a regex that ignore spaces and comments): 25 | # the numers 250 - 255 orĢ(?P) | # 200 - 249 or A regex do not understand numeric ranges, only text. To match an IP is somewhat complex with a regex. To print only the IPv4's you could extract what is matched with the -o option to grep.Īs a simpler example, you can do: $ echo "this is a simple test to extract 123.234.34.5 as an IP" |īut that will fail to precisely match one IPv4. you can then filter that output with subsequent greps to limit the IPs to a family or unique IP: from the shell you can use 'repeat the previous command with bang bang': grep 21. To see information about NIC named eth0 ip address, enter: ip addr show eth0. netstat.txt will give you all the ip addresses that start with 72. Which would be an equivalent of: perl -lne 'print for Here using negative look-around operators ( (? 
Note that grep outputs the lines that match. So far this is what I have been able to cobble together, but this command is including more than just the IP of the clients sending the request. (here also replacing those with as often matches a lot more than just 0123456789). I am in the prosses of decommissioning an old Redhat public BIND server and would like to find all unique IP address that are sending DNS request to this Nameserver. Now, if you want to match on lines that contain an IP address as a whole word, where words are blank-delimited, you could use: d='' ^ and $ match respectively at the beginning and end of the line, so lines with those IP addresses are only matched if the IP address is both at the beginning and end of the line, that is if the IP address is the whole line.
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