![]() The first column is usually an IP address in most access log files. system ('grep -Po 'randnum\\K ' log.txt') or you can use one of Perl's myriad of ways to write a string that prohibits backslashes from expanding at all. You can double-escape the backslash if you want. Let’s look at how we can use the awk command to extract all the IP addresses from the sample.log file: $ awk 'match($0, /(25|2|?)\.(25|2|?)\.(25|2|?)/) ' sample.log Perl is treating the \K as an escape sequence and removing the backslash in the actual string system sees. Moreover, we can define an action to perform whenever a match is found. It lets us write small but effective programs as statements that define text patterns to search for. The awk command is a Linux utility to manipulate data and generate reports based on the data. ![]() 3 4 grep was originally developed for the Unix operating system, but later available for all Unix-like. ![]() Its name comes from the ed command g/re/p ( global / regular expression search / and print ), which has the same effect. We’re passing the -c option to the uniq command to get the total count of individual IP addresses. grep is a command-line utility for searching plain-text data sets for lines that match a regular expression. It also filters the list so it’ll only print unique IP addresses and their respective counts: $ grep -Eo '(25|2|?)\.(25|2|?)\.(25|2|?)\.(25|2|?)' sample.log | uniq -c | sort This counts and sorts the records in ascending order. We can push things further and pipe the results to the uniq and sort commands. We’re using the -E option to interpret the patterns as extended regular expressions (EREs) and the -o option to trim the results and only print the matched part. This regular expression is more strict since it only matches IP addresses that have a value equal to or less than 255 in each of its four parts. In the next sections, we’ll explore different methods for extracting IP addresses from this file. NET CLR )" "-"ħ3.166.162.225 - "GET /apache-log/access.log HTTP/1.1" 200 1299 "-" "Mozilla/5.0 (Windows NT 10.0 Win64 圆4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/.101 Safari/537.36" "-"Įach line above represents different entries in this format: IP-ADDRESS - REQUEST & REQUEST-INFORMATION
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