12/25/2023 0 Comments Open file unix command grep perlThe first column is usually an IP address in most access log files. 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 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. You can pipe gzip -dc into filehandles like this: open (my fh1, '-', '/usr/bin/gzip -dc filename1.gz') or die open (my fh2, '-', '/usr/bin/gzip -dc filename2.gz') or die It should buffer the output from gzip, and not use space on your disk. We’re passing the -c option to the uniq command to get the total count of individual IP addresses. 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. You can go to the next instance using :cn and previous instance using :cp. Vim will open the first file in /tmp/foo.list and place the cursor directly in the line where foo was found. We can push things further and pipe the results to the uniq and sort commands. You can use quickfix or errorfile feature in vim: grep -n foo > /tmp/foo.list vim -q /tmp/foo.list. 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. Finally, by using the cat command, we can see the final output without the M character. Additionally, if we want to edit the file inline, we can use the -i parameter. 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 this example, we’re using the sed command ‘s/\r//’ to find and replace the \r character with an empty value. 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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