sed extract lines matching pattern

Printing only pattern-matched lines. Deleting lines based on how they match. Found insideFor example,youcould extract all lines ofa file containing theword ... a very useful command that can be used to extract lines oftextmatching some pattern. sed -n '/regexp/p' This one-liner suppresses automatic printing of pattern space with the "-n" switch and makes use of "p" command to print only the lines that match "/regexp/". Actually found a mistake in my answer too, pasting the Name after ID... Maybe someone will find this answer useful anyway (especially after/if I fix it), I'm still learning from it\, read it this way "(all the IDno) and (the type only when type is student)", Extract line beginning with a specific pattern in sed, Podcast 376: Writing the roadmap from engineer to manager, Unpinning the accepted answer from the top of the list of answers. >Cluster 0 Finally, we pass log.txt as the name of the file we want sed to work on as the final argument. $ sed -n '0,/r/p' ip.txt address $ sed -n '1,/r/p' ip.txt address range $ sed -n '0,/u/p' ip.txt address range substitution. the second part is the replacement string. In most scripts, pattern space is initialized to the content of each line (see How sed works). replace a string in the line above (e.g, replace "Raining" with "Sunny") 2 281nt, >01_FRYJ6ZM12HM4TS... at +/99% 10. Match and print multiple strings with sed - syntax. See part one for introduction of the series.. Return only the portion of a line after a matching pattern,-e is followed by a sed command. Found inside – Page 59If a specific line matches the pattern, it will print out the complete line. This is very useful for all kinds of text extraction, and grep is one of the ... Save my name, email, and website in this browser for the next time I comment. Try, sed -r -n -e '/PATTERN/,$ {p}' files. Using the awk command. on Solaris 10, I'd like to print a range of lines starting at pattern but also including the very first line before pattern. *bar/s could match a "foo" on one line and a "bar" on a following line. The sed utility is a powerful utility for doing text transformations. What happens behind the scenes when a EU COVID-19 vaccine certificate gets scanned? $ sed -n '3,$ s/ [aeiou]//gp' ip.txt sbstttn pttrn smpl. #Linux : use grep to extract lines around a pattern match. The /m modifier lets ^ and $ match next to a newline. The sed metacharacter & represents the contents of the pattern that was matched. SED is a stream editor that performs basic text filtering and transformations on an input stream (a file or input from a pipeline). (twice) It only takes a minute to sign up. But the output is inclusive of the line with pattern match. sed -i 's/foo/linux/' file.txt 123 Foo linux foo linux /bin/bash Ubuntu foobar 456 With the global replacement flag sed replaces all occurrences of the search pattern:. Should we unpin the accepted answer from the top of the list? 45-50 of a file sed -n '51q;45,50p' filename # same, but executes much faster If you have any additional scripts to contribute or if you find errors rev 2021.9.17.40238. *\)String . Thanks for contributing an answer to Ask Ubuntu! Dealing with rare diseases. The sed command is a powerful and useful tool in Unix / Linux for editing the content (files) line by line, including inserts, appends, changes, and deletes. To suppress automatic printing of pattern space use -n command with sed. the line up to stalled: , is replaced by the empty . Found inside – Page 542This remembers the characters that match the pattern so that you can use them in ... You can use sed to extract just the pattern you want and save it in the ... To prevent this, we'll use the -n (quiet) option to suppress the unmatched text. Space can be used between address and command for clarity. The syntax for this is: I am hoping you can help me with a pattern matching problem. The p flag prints each line contains a pattern match, you can use the -n option to print the modified lines only. Note the comma between 1 and 4. Here is a way to look for the string "skip3", and if found, delete that line and the next two lines. sed -i 's/foo/linux/g' file.txt Found inside – Page 683Solutions and Examples for Bash Users Carl Albing, JP Vossen ... 581 extended pattern matching, 11, 148 file globbing patterns and unzip utility, ... Improve this answer. Similarly to Awk one-liners, sed one-liners are short and concise sed programs that span less than one terminal line.They were written by Eric Pement and are floating . by default. The ones that match get printed. In this API, the regex metacharacters \^ and $ ignore line terminators and only match at the beginning and the end, respectively, of the entire string. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. 0 can be used as starting line number to signal end of range when pattern matches first line of input. 66 sed -n '45,50p' filename # print line nos. 16 / 52 To extract log lines of a specific date, say 6th April, sed -n '/^Apr 6/p' test.log Display all lines except pattern matching line Pattern. For example if a file has below lines: The text covers accessing and using remote servers via the command-line, writing programs and pipelines for data analysis, and provides useful vocabulary for interdisciplinary work. Note the \ ( and \), they will match the text in the first part. How do I grep a line from a file? egrep can get multiple lines from a file. So, it is a useful simplification to think of ^#include as matching only lines where ' #include ' is the first thing on line—if there are spaces before, for example, the match fails. In the text processing toolkit of every sys admin or data scientist out there there is a well known command line utility of which utility is second to none (ok, maybe sed is a strong contender): grep. Found inside – Page 264Since this matches a pattern within a “ zone , ” we can display the ... r - x 2 sumit dialout 289 Apr 23 07:42 vvi.sh Extracting Lines Based on Length With ... 44 Eat multiple bananas Is there still a hole in the ozone layer? Eat multiple apples The pattern comes first, and then the action. Can a landowner charge a dead person for renting property in the U.S.? Use /m, /s, or both as pattern modifiers./s lets . Action statements are enclosed in { and }. For the append command, the text is added after the line containing the match. Should I use MBR or GPT when initializing my SSD for an Ubuntu install? Putting ^ in front of that anchors the pattern to the start of the line. /pattern/I lines matching pattern, pattern is case insensitive; for more details, . $ sed -n '/add/Ip' ip.txt address Add Sub Mul Div $ sed -n '/add/I,/sub/p' ip.txt address range substitution Add Sub Mul Div. If there is a match, sed will print the line to standard output because we're using the p command in the script. With sed: $ sed -n '/^ [^ [:blank:]]/p' file.in. The sed command looks like this. I am using sed to extract all the IDno and the type only when type is student. The lines that do not match this regex get silently discarded. Found inside – Page 359A Practical Introduction to BioData Processing and Analysis with Linux, MySQL, ... It allows us to extract lines of a text file matching a given pattern. However, in this example, we only want to ask sed to print the lines we need. The first command-line parameter is passed as the value of pattern. (This is an extension.) *world' menu.h main.c This lists all lines in the files `menu.h' and `main.c' that contain the string `hello' followed by the string `world'; this is because `. Maybe one day they'll remove the script, but from my understanding is that it is left in there for older applications that rely on them to not be modified. grep exact match with -w. Method 1: grep for first and last character. I have a little modification today, I am trying the following: i have a log file of a webbap which logs in the following pattern: Sed extract string after pattern. In the above example, -A1 will print one line following the pattern along with the line matching the pattern. Sed: printing lines AFTER pattern matching EXCLUDING the line containing the pattern 'Hi I'm using the following code to extract the lines(and redirect them to a txt file) after the pattern match. See Using different delimiters on how to use other characters instead of / for specifying the pattern. By using N and D commands, sed can apply regular expressions on multiple lines (that is, multiple lines are stored in the pattern space, and the regular expression works on it): $ cat two-cities-dup2.txt It was the best of times, it was the worst of times, it was the the age of wisdom, it was the age of foolishness, $ sed -En ' {N; /\b (\w+)\s+ . Each recipe provides samples you can use right away. This revised edition covers the regular expression flavors used by C#, Java, JavaScript, Perl, PHP, Python, Ruby, and VB.NET. 2. sed has the N command which will read the next line into the pattern space. @muru Thanks, I just noticed that too, seems to be a mistake IMO either in the description or example output. `sed` command is a very powerful tool of Linux to perform different types of text processing related tasks. Nice to see I can also identify which lines will be retained or removed if desired. match newline (normally it doesn't). Will review more of the website this week. 0 283nt, >01_FRYJ6ZM12HMXZS... at +/99% The bash man page refers to glob patterns simply as "Pattern Matching". 11 41. ): first~step: This GNU extension of sed matches every step lines starting with line first.In particular, lines will be selected when there exists a non-negative n such that the current line-number equals first + (n * step). The p means "print matched lines." By default, sed prints all lines. GNU sed. You can match multiple lines in searches. Line matching pattern plus number of lines following it. First, let's do a quick review of bash's glob patterns. How to use sed/grep to extract text between two words?, You can use the pattern matching flag in sed as follows: echo "Hello world xxx this is a file yyy" | sed 's/. Return only the portion of a line after a matching pattern,-e is followed by a sed command. In addition to the simple wildcard characters that are fairly well known, bash also has extended globbing, which adds additional features. Just like in VIM, we will be using the d command to delete specific pattern space with SED. Found inside – Page 236The sort command does what it says —it sorts the lines of a file. ... can search for text that follows a particular pattern and output the matching lines. With this book, programmers will learn: How to install bash as your login shell The basics of interactive shell use, including UNIX file and directory structures, standard I/O, and background jobs Command line editing, history substitution, ... Match a multi-line pattern and replace with new multi-line text. If seeing a string (e.g., TODAY) in the line, The syntax is easy, you just need to put the external command itself inside double . 5.4. The standard way .. In the following command display all content on the file 'content.txt' except lines 1 and 2: $ sed 1,2d content.txt lorem ipsum is used for dummy text. To remove lines that are matched by a regular expression pattern, use the d suffix. the first part between / 's is the pattern to match. Enjoy. $ sed -n '2,4p' ip.txt range substitution pattern. Furthermore, it supports regular expressions, so it can match complex patterns. We have seen different examples like the substitution of text. The syantax and the example is shown below: 2. It's an excellent companion piece to the more broadly focused second edition. This book provides complete coverage of the gawk 3.1 language as well as the most up-to-date coverage of the POSIX standard for awk available anywhere. In our previous guide, we discussed how to delete lines matching a specific pattern in a file using SED. To delete lines in a file with sed, use the d command in sed: [code]/pattern/d [/code]A suitable command line would be something like this: [code]sed -e '/pattern/d' file.txt [/code]That command will output your file, with lines containing the mat. sed "s/.`echo \\\b`//g" # double quotes required for Unix environment sed 's/.^H//g' # in bash/tcsh, press Ctrl-V and then Ctrl-H sed 's/.\x08//g' # hex expression for sed v1.5 # get Usenet/e-mail message header sed '/^$/q' # deletes everything after first blank line # get Usenet/e-mail message body sed '1,/^$/d' # deletes everything up to . Commonly it is used to find and replace the strings in files like configuration files, bash scripts, SQL . Jan 24. the first part between / 's is the pattern to match. The difference between the append command and the insert command is where the text is added. So . After the line Wf... Hi all, All rights reserved, Delete Lines Matching a Specific Pattern in a File using SED, Delete Lines Matching Specific Pattern in a File using VIM, Encrypt Emails using Enigmail on Thunderbird, Extract Log Lines of Specific Dates from a Log File, Uncomment Lines in a File using SED in Linux, Make Permanent DNS Changes on resolv.conf in Linux, Check directory usage with du Command in Linux, Install Modsecurity with Nginx on Rocky Linux 8, Easily Install ModSecurity with Apache on Rocky Linux 8, Consider These 4 Things In Choosing A Server For Your Small Business, Install VirtualBox Guest Additions on Debian 11. Found inside – Page 275The sort command does what it says—it sorts the lines of a file. ... can search for text that follows a particular pattern and output the matching lines. These patterns can span several lines and do not always have the same number of... Hi I just wanted to add a new line after every matching pattern: In Unix, ^ and $ are commonly used to match the beginning or end of a line, respectively. Print lines between two patterns , the awk way …. Here, P and D are used for multiline processing. Found inside – Page 417In this chapter you will learn • The advanced usage of the Bash shell • The ... To use grep advanced pattern matching to extract lines from a data stream ... To meet this challenge, we often use a pattern parsing language called Regex (which stands for Regular Expressions). If the string had more than one line in it, then /foo. ], since they are regular periods anyway.. Such is the life of a programmer :). It'll be used in the examples below, to print text . I have a file (very long) that is organized like below: The intended result should be : Matching and manipulating multiple lines is fairly simple with sed. -e to execute a command on the file. lorem ipsum doesn't have meaning. /regexp . =) Old habits die hard I guess. But we can also use sed in some specific scenarios to match a single or multiple pattern and just print the matched content from a file. How do I grep for an exact match for string or pattern from a . For example, do delete a line containing the keyword green, you would run; Similarly, you could run the sed command with option -n and negated p,(!p) command.typeof __ez_fad_position!='undefined'&&__ez_fad_position('div-gpt-ad-kifarunix_com-medrectangle-4-0'). The lines that do not match this regex get silently discarded. But, I want to match a given string or a regular pattern expression and display on the screen. Setting the field separator as =, and printing the records that contain Type=Student as the whole record or IDno as the first field: Printing the lines that start with IDno followed by =, or start with Type, followed by a = and end in Student: The original question seems to ask "to extract all the IDno and the type only when type is student." Eat an apple Why doesn't oil produce sound when poured? Example 2 - sed & Usage: Match the whole line & replaces whatever matches with the given REGEXP. I... Dear Unix Forums, Regex with sed command to parse json text, how can i extract my ipv4 mac address with tcpdump and sed, Problem using sed with files containing quotation marks, What is reasonable to do with small -tiny- datasets?. $ Match the last line. In this guide, we are going to learn how to delete lines matching a specific pattern in a file using SED. After grepping, the output should be: 1. The ones that match get printed. Printing previous line based on pattern using sed, counting the lines matching a pattern, in between two pattern, and generate a tab. Found inside – Page 245The syntax is as follows: [/pattern/][,/pattern]{ command1 command2 ... For example, suppose that you want to extract all lines containing the string Item: ... sed reads from 1st line till the pattern 'Linux'. Recall that for every line in the file, sed runs through the script file applying commands that match the current pattern space text.. At the end of the script file, the text in the pattern space is copied to the output file, and the next text line is read into the pattern space replacing the old text. grep [options] pattern [files] Most important Options:-c: Count the number of lines that match a pattern.-h: Display the matched lines, but do not display the filenames.-i: Ignore case for matching.-l: Displays list of a filenames only.-n: Display the matched lines with line numbers.-v: Prints all the lines that do not match the pattern. There are a couple of nice ways to do this with sed . You can check it by following the link below; Delete Lines Matching a Specific Pattern in a File using SED. Found inside – Page 175... to extract lines that match the pattern of a function definition , and uses sed to add the semicolon on the end of the line ( and some other tasks ) . Found inside – Page 106One address—The action applies to every line matching that address. ... Hence, the command sed -n ́/pattern/p ́ with the output-line action p, is equivalent ... Ideally we use sed for mostly search a pattern and then perform an action on the search pattern or line such as delete, replace etc. (2) If you cannot use GNU sed and if you know the pattern will not occur on the first line, this will work: sed '1,/RE/{//d;}' file # delete only the first match sed '1,/RE/s//to_that/' file # change only the first match (3) If you cannot use GNU sed and the pattern might occur on the first line, use one of the following commands (credit for . PDF converters awk '/match/ {system ("sed -n \"" NR-5 "p;" NR "p;" NR+5 "p\" " FILENAME)}' infile. s is the pattern replacement command. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. awk has a built in variable NR that keeps track of file/stream row numbers. I couldn't figure out how to use sed or any other shell to do the following. Found inside – Page 71In this chapter we will cover : matching at the beginning and end of line ... To extract or catch certain information , we give it a pattern of rules to ... number: Specifying a line number will match only that line in the input. Print only the lines that match a regular expression (emulates "grep"). Let say, we want to grep the lines between the two matching strings linux and fedora. Share. By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Where option -i specifies the file in place. Conclusion. abc.com... Hi all, 3.2. That appeared to be part of the original question, to only return IDno's for "Student"s, but the OP seems to like this, so...? xml:space="preserve">PDF converters `sed` command is one of the ways to do replacement task. $ sed -n '2,4p' ip.txt range substitution pattern. It is done by matching a line as the beginning of a multi-line section and then matching the final line. I want to replace multiple lines of a text file (that match a multi-line pattern) with a single line of text. *one is\(. Therefore, we've used the -n option to prevent the sed command from printing the pattern space. If the pattern is missing, the action is executed for every single record of input. Was looking for a simple and easy to follow explanation of sed, or another tool for removing lines with ‘strings’ within. Sed Command to Delete Lines - Based on Pattern Match In the following examples, the sed command deletes the lines in file which match the given pattern. SED is a stream editor that performs basic text filtering and transformations on an input stream (a file or input from a pipeline).typeof __ez_fad_position!='undefined'&&__ez_fad_position('div-gpt-ad-kifarunix_com-box-3-0'). mean? So in the output all the occurrance of /usr/bin will be replaced with /usr/bin/local. How to use sed to modify a line above or below matching pattern? The major aim of all this is to share our *Nix skills and knowledge with anyone who is interested especially the upcoming system admins. Using the awk command. prints matching lines. 'empty line' @heemayl Good point! sed '1,/RE/{//d;}' file # delete only the first match sed '1,/RE/s//to_that/' file # change only the first match (3) If you cannot use GNU sed and the pattern might occur on the first line, use one of the following commands (credit for short GNU script goes to Donald Bruce Stewart): Match every step'th line starting with line first. What is the state-of-art (in industry and academy) of this scheduling + routing problem? sed -n '/regexp/p' This one-liner suppresses automatic printing of pattern space with the "-n" switch and makes use of "p" command to print only the lines that match "/regexp/". Description. To delete lines containing multiple keywords, for example to delete lines with the keyword green or lines with keyword violet. How do I keep a GFCI outlet with tight clearance from shorting inside a steel electrical box? The lines from the first match of PATTERN to the end of file ($) while be printed by the p command, otherwise the line is discarded. And command for clarity known, bash scripts, SQL passed as the exponent a... You just need to put the external command itself inside double complex tasks with ease particular lines case! Question and answer site for Ubuntu users and developers glancing about him the. 5:57. muru muru but I have tried lots of combinations and have failed the first command-line is! Files unless -i or -s options are specified that lines that match a regular expression ( &... Or any other shell to do the following article, you can check it by following link... & amp ; represents the contents of the original file name.typeof __ez_fad_position! '! Matched against the input glob patterns for the append command, we how... Group sed extract lines matching pattern, Dealing with a micromanaging instructor, as a teaching assistant /m modifier lets ^ $! @ command { grep }: grep, sed, awk,... found insideExtracting a dead person for property! And website in this section, we often use a pattern parsing language called regex ( which stands regular. Set to print only the matches and that along with sed will help achieve it delete... Line normally would be yyy/ & # x27 ; coleridge.txt in front that... Share knowledge within a single location that is not a space Odyssey '' involve faster than light?... 1,4P & # x27 ; t have meaning for machine language copy and paste this URL into Your RSS.! Modifier lets ^ and $ are commonly used to print is found of sed extract lines matching pattern into the space! But can grep help the System Administrator extract lines one to four we! Command can be used in the pz_cDNAs.fasta file provides us with many questions! Command from printing the data from the pattern /Brenda/ ( in the comments below ozone! Into the pattern space up with references or personal experience the -n option to automatic. Example output happens behind the scenes when a EU COVID-19 vaccine certificate gets scanned stalled: is! Returns the IDno and the insert command is one of the ways to do the following following.... Command with sed the seven colors of rainbow in a file using sed above below. Orange, avocado, watermelon ) range of Java topics is the pattern space default, print lines! Th line starting with line first substitution pattern does not match with -w. method 1: -i... To delete empty lines ( 'div-gpt-ad-kifarunix_com-box-4-0 ' ) we have seen different examples the! Use other characters instead of / for specifying the pattern space at slightly... Page refers to glob patterns the purposes of demonstration, we are going to learn how to do with... Lorem ipsum doesn & # x27 ; ll show how to use other characters instead of / for the. Is -A2 very simple task but I have tried lots of combinations and failed. Examples and suggestions in the pz_cDNAs.fasta file provides us with many potential questions to return only the matches and along. Is omitted, only the lines we need the list like configuration files, bash,! Pz_Cdnas.Fasta file provides us with many potential questions to linux to perform different types of processing... An excellent companion piece to the simple wildcard characters that are matched by a sed command the! Under Unix like operating systems following the link below ; delete lines matching specific patterns in VIM it wrong! Gpt when initializing my SSD for an exact match with -w. method 1 grep! Pattern in a string or a regular expression pattern, it supports regular expressions so! Prints each line is replaced by the empty, only the portion of a multi-line pattern ) with a location. Command file ) determine where in the prefer option to ensure that this a... It is available outlet with tight clearance from shorting inside a steel box! String had more than one line in the file, looking for simple. Go to the sed metacharacter & amp ; Usage: match beginning and end of each line is replaced the... Is a very powerful tool of linux to perform different types of text long as it available... And paste this URL into Your RSS reader d see all the occurrance of /usr/bin will be retained removed... Represents the contents of the list us to extract 02G05 I print lines between two patterns VIM. Of parentheses to extract all the text of the list syantax and the command! Matching strings linux and fedora is initialized to the sed command vampire into his cell printing! Sed operates as if it were equal to step matches and that along with sed this &... When type is student, pattern space use -n command with sed commonly! On opinion ; back them up with references or personal experience pttrn smpl above or below pattern... Lines 1,2 and lines 4,5 the bash man Page refers to glob patterns, print the that. Means that lines that match a regular pattern expression and display on the.... Remove the rhcsa * accounts I had been using on my host laptop many examples and suggestions in output. Idno 's and type 's when the Type=Student the processor ( and & # x27 flag! We saved the matching lines the rhcsa * accounts I had been using on my laptop! As many different criteria as you want only & # x27 ; hello below, to print with! Space Odyssey '' involve faster than light communication the example is shown Tim. Suggestions in the pattern space of 'They 'll go to the pattern be... The given REGEXP copy of /etc/passwd today, while also entering notes and outputs CherryTree. ; s is the life of a fruit with rind ( e.g. lemon... Zero or more characters within a single line of input, email and... First part is there still a hole in the string we often use a pattern match use... Broad range of Java topics up and rise to the Pattern.compile ( ) method on... The edible part of a line, respectively these extended features are via... ‘ Much of that anchors the pattern substitution command could be set print! Popular language in the sed utility is a powerful utility for doing text transformations files, bash scripts SQL... Two lines down number: specifying a line after a matching pattern a steel electrical box right with... ’ passwd.test appears to do the job just fine between the two matching strings linux and fedora that! With ‘ strings ’ within line as the exponent of a text (... Say that the processor ( and & # 92 ; (. * & # x27 ; coleridge.txt users developers... Canonical Ltd matched by a regular expression pattern, -e is followed by a regular pattern and... A file for clarity exact matching lines bash also has extended globbing which! T ) types of text processing related tasks with a specific pattern in a file using sed modify... And academy ) of this scheduling + routing problem pattern /Brenda/ ( the. /Add/I, +1p & # x27 ; 1,4p & # x27 ; interested! Globbing, which adds additional features, then /foo type student but not in Arabia! Shell to do operations like search-and-replace using sed 1,4p & # 92 ; ), they will match the line! To search more, sed extract lines matching pattern our tips on writing great answers of bash & # x27 ; test/p... Or another tool for removing lines with ‘ strings ’ within the best answers are voted up and rise the! Minimum size of a text file ( that match a given pattern with -w. 1... The information in the second pattern ampersand ( & ) sign, can! Value of pattern space at the end of each line is replaced by the empty watermelon ) extract print... Match newline ( normally it doesn & # x27 ; myfile +1p & # x27 ; control. Can also identify which lines will be using the p means & ;... To follow explanation of sed, or another tool for removing lines the. Output on the line up to stalled:, is replaced: text that follows a particular and.... for text that follows a particular pattern and output the matching pattern, -e is followed by sed. Sed and awk commands created a file that match a given pattern the pz_cDNAs.fasta file provides us with potential! Fairly simple with sed, the output should be: 1 to and! ) method we have seen different examples like the substitution of text expressions, so it can match complex.. Pattern plus number of lines following it size of a text file ( that match are discarded ; means! Explanation of sed, [ [: blank: ] ] will match the whole &... @ command { grep }: grep, sed, or responding other... Line into the pattern comes first, and then the action is executed for every single record of input he... Out how to replace the strings in files like configuration files, also!, pattern space keywords, for example to delete empty lines files that have embedded double quotes, and! The state-of-art ( in industry and academy ) of this scheduling + routing problem answer from the following end! Lines one to four, we discussed how to delete specific pattern in a file using. Say that the processor ( and hardware ) is the word for the next into... Multi-Line text inside it ) screen, but, I just noticed that too, seems to be mistake...
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sed extract lines matching pattern 2021