Grep number of lines after match 168. Then, it prints out the line matching after as well. To show N lines after the grep results, including the lines containing the matched search pattern, you can use the -A flag (short for after) as follows: $ grep -A <number> <pattern> <file> For example, to show 3 lines: $ grep -A 3 "pattern" file. g. Here is what I've concocted so far: ^[D,d]ata[0-9]*later$ However the output includes all datalater lines. cat new. Noticing that grep (my version, 2. Dec 18, 2015 · I use sed to extract the lines and grep to only take the lines containing the word "MATCH". sed can be used to mimic grep like this:. *$" | cut -c 5- grep portion of command extracts whole line after "blah" including "blah" and cut command removes first 4 characters from this string. Once the pattern Linux is found, x is calculated which is current line number(NR) plus 2. barfoo, for example, it is necessary to quote the regex which is why I have edited my answer to include double -x use to match whole line, and defined by POSIX (See grep). log a. grep -E '^[^0-9]*([0-9][^0-9]*){N}$' sample. Its name derives from the command sequence in the original Unix text editor ed: g/re/p (globally search for a regular expression and print). 122 ABB. Indeed, with the power of Regex, grep is good at pattern matching jobs. For example: $ cat mytext. Or you can use. The GNU and BSD grep utilities has the a -A option for lines after a match and a -B option for lines before a match. This venerable yet enduringly useful tool searches files and output for specified text patterns. e. grep -r -i -B 5 -A 5 "match" I'd like to only receive the 5 th line before a match and the 5 th line after the match in addition to the matched line and Feb 4, 2011 · Python File Search Line And Return Specific Number of Lines after Match. One of grep‘s most helpful capabilities is displaying lines before and after a match, providing invaluable context and visibility into relevant content […] Mar 18, 2024 · We can use grep to extract lines containing a specific number of digits:. txt | select-string -pattern "" How to show the previous and after 3 lines each for the matched lines? (Like the -C3 parameter of grep. . echo "random text string blah strings after" | grep -o "blah. txt | grep -c "" The -o in the first grep outputs each match, and just the match - not the entire line (unless the entire line IS the match, of course). grep text_to_search -C n file. 5. However they pull in all lines between the match based on however many lines are specified. You will get --lines between your context, and can use an inverted match -v to remove them. -B NUM, --before-context=NUM I am just wondering if it's possible to print trailing lines until a specific word is found after each match. txt is the file we want to search for patterns. Improve this answer. Printing Context For grep Matches When using grep , you can add the uppercase -C flag for "context," which will print out N number of lines before and after the match. egrep -c ^123[a-z]+$ file. Aug 30, 2015 · Here's a sed solution (with -n i. This is done twice. txt is the file which contains the word/pattern/string . Sample File I am using cut in-conjunction with grep to get strings after a keyword "blah" in this case. From man grep: Context Line Control -A NUM, --after-context=NUM Print NUM lines of trailing context after matching lines. Oct 28, 2012 · Alternatively you can use sed. I tried: grep -v -A 4 -B 1 Thanks in advance! Example: Rule: r1 This is computationally WAY faster than using a modified regex as in the accepted answer -- in my tests, about 10-20X faster than a regex matching 10 chars on either side, and 130–360X faster than a regex matching 255 chars on either side! 255 chars is the maximum number one can match for a single character on some systems, but cut allows It's the line after that match that you're interesting in, right? In sed, that could be accomplished like so: sed -n '/ABC/{n;p}' infile Alternatively, grep's A option might be what you're looking for. The -c in the second grep then counts 'em. There are some options which can force it to match only part of the line, or (as in your example) span pattern to match more than one line, but usually if you need to do use such options it means that other tools should be used instead. For example, this will count number of lines in the file that match the ^123[a-z]+$ pattern:. txt P. That being said I would rather use awk in your first May 26, 2014 · A default install of Solaris 10 or 11 will have the /usr/sfw/bin file tree. Gnu grep - /usr/sfw/bin/ggrep is there. EOF Exchange is where users like Note that grep does not match across lines - for multi-line matches, you can use pcregrep instead. I only want the part timestamp and the last 9 characters from the line to be returned, not the complete line. Parse log file for value changes. If you want to start from the last match instead of the first match it would be: tail -n +$(( 1 + $(grep -n -f file2 file1 | tail -n1 | cut -d: -f1) )) file1 Sep 21, 2024 · This option will suppress the normal output of grep and instead print a count of the number of matching lines. Let us see how to count lines when a match is found with the grep command and zgrep command. Feb 12, 2015 · The command grep processes text in lines, whole lines. First, use grep to get the line on which the desired string is (-n to output line number; -m 1 to stop searching after the first match): because this command will show 12 lines after the match, which includes the driver used to control the network (-i net) card. With the -o or --only-matching option, this has no effect and a warning is given. I'm not quite sure about the syntax and I don't have the possibility to test it at the moment. (If you wanted to print the filename as well, grep style, change print; to print FILENAME ":" $0;) awk doesn't have any equivalent to grep's -r flag, but if you need to recursively scan directories, you can use find Mar 19, 2023 · grep in general is only meant to work on text, so depending on the grep implementation, input with NUL characters or with overlong lines or not ending in newline characters could put a spanner in the works. *Accton/' file. Then remove the group separators. It won't return lines where it only appears once. – Martin von Wittich Commented Jun 21, 2016 at 19:59 Sep 17, 2011 · the number in the modulo (NR%5) is the added rows by grep (here it's 3 by the flag -A3), +2 extra lines because you have current matching line and also the -- line that the grep is adding. Feb 15, 2010 · $ grep -w ^vivek /etc/passwd Find lines ending with word foo: $ grep 'foo$' filename Match line only containing foo: $ grep '^foo$' filename You can search for blank lines with the following examples: $ grep '^$' filename Matching Sets of Characters. -B NUM, --before-context=NUM Print NUM lines of leading context before matching lines. In this example, grep is the command used to find patterns in files, -E enables the extended regular expressions, ‘^[^0-9]*([0-9][^0-9]*){N}$’ is the regular expression to match the lines with N digits, and sample. Next, instead of piping it to grep -v , we pipe it to a command that can print every (n+1)-th line . txt Jul 24, 2014 · Number of lines before and after a match, including the match (i. grep command normally prints all matched patterns in a file. *Accton" file. keep the lines between) then instead of a number, you can search for a line with /pattern/. Aug 25, 2018 · While this works for small log files, it has a peak memory requirement proportional to two times the total size of the log file (the line input = f. Feb 20, 2024 · To print the n number of lines after the matching lines, you use the -A flag and specify the number of lines as shown here: grep -A <number_of_lines> PATTERN Filename If I want to print one line after the matching lines, then I will use the following: Apr 17, 2019 · What I am looking to do is use regex to match any line that starts with data and ends with later AND has numbers in between. Nov 30, 2023 · Showing N lines after thegrep result. Jan 11, 2015 · grep for the line number of the first match of 182: grep -m 1 -n 182 /var/log/file |cut -f1 -d: Use that to grep for all the ABC's only after the first matching line Jun 8, 2011 · It will look for a pattern, and extract the 5th line before each match. How to match sets of character using grep . preferentially one liner. awk '/yahoo/{y=1;next}y' data. 2. 1) does produce a "small, default" separator between groups (--), you can easily replace that string with a string of your choice: May 16, 2015 · By including the -n flag, I see the line number of the data I'm seeking, like this: 2543 my crucial data Since cat gives the line number 2 spaces before and 1 space after, I could grep for the line number right before it like this: cat -n filename |grep " 2542 "I ran this a couple of times to give me lines 2542 and 2544 that bookended line 2543. 255 scope global dynamic noprefixroute enp0s3 valid_lft 6826sec preferred_lft 6826sec inet6 fe80::129e:c85e:f067:e115/64 scope link noprefixroute Jul 2, 2009 · grep's -A 1 option will give you one line after; -B 1 will give you one line before; and -C 1 combines both to give you one line both before and after, -1 does the same. txt Selectively showing N lines before and after the grep result May 22, 2015 · With only POSIX tools, one approach, if possible, is to split the input into lines with a single match before passing it to grep. May 27, 2015 · How can I match a bash variable in the end of the line? The code below can do that for a number in the end: grep '[0-9]$' But in my case the number is a variable. log will print all the matches with after and before 10 lines grep "searchString" my. ) –. To get the n-th line after each match, we can first use grep -An to find each block with n+1 lines. I would need the lines number in the log file where a match is found. grep is an indispensable tool in the Unix toolkit. @Ruchi: But Dennis' answer doesn't print all 5 lines following the second occurence in this case. grep -count --file=PATTERNFILE FILE or simply. Jun 21, 2016 · There's also grep -c, but it doesn't exactly do what you require: "Suppress normal output; instead print a count of matching lines for each input file". 123 it shows all of the lines Oct 30, 2013 · There is a straightforward way to do this using grep. The line number will be delimited from the contents of the line by a colon. {0,10}" in order to see some context around it:-o, --only-matching Show only the part of a matching line that matches PATTERN. If you provide a single digit input you get that number of lines before and after. so it will no longer true after the desired number of lines are printed; Jun 26, 2012 · For more control on number of after and before lines to be displayed for a match, use. May 10, 2020 · Either of the following: grep "cat. txt -A 2 5:Line5 6-Line6 7-Line7 From man grep: Context Line Control-A NUM, --after-context=NUM. You can set LANG or LC_CTYPE to use utf-8 to get the same behaviour. txt awk '/cat. Bm stands for m lines "before" the match. sed -n 's/pattern/&/p' By default sed prints every line even if no substitution occurs. To print lines after match: grep -A 2 "string to match" file. grep -A2 "PATTERN" file | grep -v -- "^--$" Using awk: awk '/PATTERN/{c=NR+2}(NR<=c){print}' file Using sed: sed '/PATTERN/,+2!d' file Perl one-liner Jul 5, 2013 · awk '/match me/{print;exit}FNR>50{exit}' *. For example, if you're looking for whole words, then first turn every non-word character into a newline. txt To print lines before match: grep -B 2 "string to match" file. 123 I want to find a exact match of ABB. grep -A10 -B10 "searchString" my. Places a line containing a gup separator (described under --group-separator) between contiguous groups of matches. ]+$' 130. read(). It works only when multiple matches are found in the same file. $ grep -B 4 'keyword' /path/to/file. Jun 13, 2013 · grep -C 1 BBBB input grep has three options for showing context lines:-A NUM, --after-context=NUM Print NUM lines of trailing context after matching lines. Feb 20, 2014 · :!grep -A 5 "Incident ID" filename. Jun 2, 2015 · The following command will show the lines match the pattern. txt That will only return lines where foo appears two or more times. Mar 6, 2014 · grep -A and then a number gets the lines after the matching string, and grep -B gets the lines before the matching string. sed '1,5!d' : delete lines not between 1 and 5 (i. fff), I would like to grep the file above to get in the output: all_lines except ( grep has extra options to define how many lines before and after the result:-A (after) -B (before) -C (context [before + after]) So in your case you need -A: YOUR_COMMAND |grep -A NUMBER YOURDOMAIN the above command prints NUMBER of lines after YOURDOMAIN in file. grep -cf PATTERNFILE FILE Jan 27, 2015 · For example, I want to output the line with a match, the 8th line after the match, and the 17th line after the match. Is this possible? I know I can output the next 17 lines using grep -A17, but I want to know if I can get the useful line without everything in between. To break it down: The -n flag suppresses output of every line—we'll tell Sed to output what we want manually. So, we will print lines from the current line till the line number(NR) reaches x. ) matches any single character. Share Improve this answer Aug 12, 2013 · This solution is not perfect, but uses simple grep commands that I can write from memory. For example, given the following input file: foo bar baz bash bongo Jan 30, 2018 · In above file i want to search for "ef" and print lines between "Strat_pattern" and "End_pattern". Jul 1, 2020 · grep "foo. txt inet 192. -o, --only-matching I think the best way is to use grep in combination with cut and tail. When grep stops after NUM matching lines, it outputs any trailing context lines. In general, the command is: grep text_to_search -A n -B m file. Print NUM lines of trailing context after matching lines. log. Jul 27, 2017 · You could use the grep options -oE, possibly in combination with changing your pattern to ". Jun 18, 2017 · -r recursively searches the directory, -o will "show only the part of a line matching PATTERN" -- this is what splits up multiple occurences on a single line and makes grep print each match on a new line; then pipe those newline-separated-results back into grep with -c to count the number of occurrences using the same pattern. May 17, 2012 · To print 5 lines after the pattern, simply replace the number 2 with 5. Oct 11, 2013 · Use grep with the parameters -A and -B to indicate the number a of lines After and Before you want to print around your pattern: grep -A1 -B1 yourpattern file An stands for n lines "after" the match. Jan 1, 2024 · 13. Apr 19, 2013 · Since grep is line-oriented matching multiple lines with a regular expression is not easy. When the -v or --invert-match option is also used, grep stops after outputting NUM non-matching lines. grep LATENCY file. The dot (. 104/24 brd 192. When I search for "Word A" I want to see the line containing "Word A" and also the lines after it until the one containing "Word D". I suppose I could pipe the output and grep -v datalater, but I feel like a single expression should do the trick. 0. The above will work without quotes most of the time but in other cases where there are filenames in the directory that match the glob such as foo. It finds inclusive address ranges (line ranges) starting with a match of pattern and ending with a match of a following empty line (matching ^$). See here for good explanation of what LC_ALL does. Date: TST STARTS DISCARD str1 DISCARD str2 MATCH str3 //line 5 MATCH str4 //line 6 DISCARD str5 TST FINISHED I use this command to extract the lines: I found that the following code works great to pull out matching lines in File2 along with the 3 lines after the match in a short test file. Aug 8, 2019 · You say that you want to grep a given number of lines after a match but your code actually prints the last 1000 lines of the file to which you appended the results of grep -v auto. Nov 6, 2009 · Sure there is (from the grep man page):-B NUM, --before-context=NUM Print NUM lines of leading context before matching lines. Jul 12, 2015 · You can use grep -A <number> to get that number of lines following a match. grep: Find the line and output 2 lines after, How to run grep and show x number of lines before and after the match. First value: $ head -n 1 /tmp/pwpower. Then, in xxwarwar, grep -o will find xxwar, but resume search for more matches after that, so won't find arwar. As an alternative to the other answers, using just grep: grep -o "seach pattern" somefile. Places a line containing -- between contiguous groups of matches. Just like the previous lines, you can also print next lines after every match. If you don't mind using AWK:. txt grep --count "PATTERN" FILE Is exactly the same as: grep -c "PATTERN" FILE And it is equivalent to: grep "PATTERN" FILE | wc -l As a bonus, below i give you a version where a file with a list of patterns is used. aNumber timestamp commandInformation I use the command . extension Sep 28, 2018 · Just to be clear - finding lines with 2 or more such words is trivial, finding lines with exactly 2 such words using only standard grep is the thing that's hard so make sure when you post your sample input and expected output to include in the input lines with more than 2 words of 4+ letters like foo stuff and things with bar to make sure those Jan 17, 2011 · I have these: $ cat a. When the -c or --count option is also used, grep does not output a count greater than NUM. grep -n -F -w '27QL' file Here, I've also used the non-standard -w option to only search for complete words, which Oct 1, 2018 · I've been reading How to grep -v and also exclude the next line after the match? and wondering how to exclude the 2 lines, or any number after the match using sed or any other practical tools. Related. 09 May 14, 2017 · $ grep -Eo 'Exchange(\s+\S+){4}' << EOF Meta Stack Exchange is where users like you discuss bugs, features, and support issues that affect the software powering all 167 Stack Exchange communities. Mar 11, 2015 · The -m option is probably what you're looking for:. Oct 10, 2009 · As for support of grep without -o option, the first grep outputs the relevant lines, the tr splits the spaces to new lines, the final grep filters only for the respective lines. txt Assuming that the lines with the string Accton are the only ones that have the patterns that you want to return: Dec 14, 2013 · For people like myself who have a 'very old' grep that doesn't include the --group-separator option, the following seems to be an acceptable workaround. (PS: I know most platforms by now would have been patched for \w. This can be quite useful for searching through code files, or anything else where you need to read what's going on around the match. For example, following command print next 2 lines after every match. log ABB. Places a line containing a group separator (--) between contiguous groups of matches. The -B 4 tells grep to also show the 4 lines before the match. The number, 100000 in this case, has to be large enough to include all lines before and after. log | grep CMDTYPE=NEW to filter out certain lines that I want. also note that adding a new blank line after every bb+aa+1 line won't work because what if a file has less than bb lines before the Sep 25, 2017 · The -Context parameter can be used to select a number of lines before/after the line that matched. May 10, 2018 · I know that with grep I can use the fields -A and -B to pull previous and next lines from a match. To also show you the lines before your matches, you can add -B to your grep. * matches any number of any character causing the match to include everything after /we. For BSD or GNU grep you can use -B num to set how many lines before the match and -A num for the number of lines after the match. More clarity is needed on what you are trying to do. Line numbers are printed with grep -n: grep -n pattern file. Share. Nov 10, 2013 · You can use grep for this. txt The first line The second line The third line The fourth line cat new. txt. See the documentation from the grep man page. 6. 10 Last value: $ tail -n 1 /tmp/pwpower. It need a way to match lines to a pattern, but only to return the portion of the line after the match. -A NUM, Print NUM lines of trailing context after matching lines. txt to show 10 lines after the search string is found in the file or grep -B10 &quot;search string&quot; file. Jul 15, 2019 · count the cats, print the line number and exit after the required match value. But when I do: $ grep -w ABB. -B NUM, --before-context=NUM Print NUM lines of leading context before matching lines. Jun 26, 2014 · I am searching through few logs and I want to grep the last match along with it's above and below few lines. Jul 23, 2022 · By default, it prints the line that contains the match, but it's also useful to print out the preceding lines around a match for context. log | tail -n 1 will print the last match. The combinations of -n and /p makes sed print only the lines where a substitution has occured. Jan 3, 2018 · This stores the most recent line matching the pattern before and then prints it out whenever it encounters a subsequent line matching the pattern after. splitlines() must, however briefly, hold the entire file in memory as a str, as well as a list containing a str for every line in the file). ]+$' 114. 3. It also occurs to me that if you are dealing with just the first or last lines from the file, it makes more sense to use the head or tail commands first so that you only have to match one line with grep. Next, instead of piping it to grep -v, we pipe it to a command that can print every (n+1)-th line. txt | cut -d : -f 1 Lines not containing a pattern are printed with grep -v: grep -v pattern file. current_lineno will contain the line number which contains the pattern . The problem with your approach is that you are forcing it to perform a single match on the entire file rather than on individual lines. Summary: use grep to find matching lines, then use awk to find Feb 26, 2014 · The format of the line is. May 29, 2015 · @chaos I also tested grep -A999999999 'Untracked files' with 1000000 lines before the match and 1000000 lines after the match. log | grep -oE '[0-9\. Share Improve this answer So pulling open a file with cat and then using grep to get matching lines only gets me so far when I am working with the particular log set that I am dealing with. I can use another regex to extract the line numbers, but I want to make sure grep cannot do it by itself. $ grep 'keyword' /path/to/file. Example: Let’s say you have a file named example. grep -A20 "09:55:21,651" mylog_file. Jul 3, 2012 · I have the following lines in text file myname aaa age 22 age 23 myname bbb How can i find the word after myname using linux grep command . tmp ABB. AWK. have tried grep -B[NUM] and -A[NUM] which are not useful as there could be unknown number of lines between search pattern "gef" and "Start_pattern" and "End_pattern". grep, sed, awk anything welcomed. To clearify: The command is of the format '<address1>,<address2><function>'. Dec 25, 2020 · I have found I can use grep -A10 &quot;search string&quot; file. If found, get the next line into the buffer (getline) and print the buffer (print). That approach worked just fine. 8. Follow grep pattern match with line number. Feb 27, 2018 · you can use grep's -An switch to get n lines after the match so for your example that would be . grep -A7 "searchpattern" file | grep -B1 "^--$" | grep -v "^--$" You can change the 7 to the nth line you want after the search pattern. but there are always those that lag behind) Credit for the "-o" workaround from @AdamRosenfield answer This enables a calling process to resume a search. txt This script has two parts: /yahoo/ { y = 1; next } y The first part states that if we encounter a line with yahoo, we set the variable y=1, and then skip that line (the next command will jump to the next line, thus skip any further processing on the current line). Or awk: awk '$0 == "UNIX" {getline; print; getline; print}' file Explanation: Search for UNIX in the line ($0=="UNIX"). 1. The portion before and after the match will consistently vary. I want to combine both and get the after and before 10 lines of last match. Mar 16, 2016 · string_to_search: word/pattern that you want to grep before: number of lines that you want to print before the pattern match after: number of lines that you want to print after the pattern match my_file. Stop reading a file after NUM matching lines with grep command. mail will print the first line matching match me if it appears in the first 50 lines. finding lines that contain n occurences of a certain pattern. Jul 2, 2015 · Consider a text file with the following entries: aaa bbb ccc ddd eee fff ggg hhh iii Given a pattern (e. grep -B 3 -A 2 foo README. Is there a way to display not lines but a specified number of characters? Piping git log command output to wc -l returned the wrong number of lines (and thus of commits), but grep -c ^ (or grep -c $) returned the correct number. Explanation:-A2 means print the next two lines after the match, and -x means the pattern must match across a complete line. Python iteratively grep lines after a pattern in a file. Jul 15, 2015 · To print the line number of your match, use the -n option of grep. By specifying two numbers you specify how many lines before and how many after (so in the example above 0 before and 1 after). However, the -A option will print the context following any matches: grep -A 1000000000 'Page: 25141' Dec 5, 2013 · (As for why it does what the OP wants, the option -o prints only the matching part of the line, instead of the whole line, /we is the desired beginning of the match, and . If you don't want to include test1 and test2, then you can remove them afterwards by grep -v, which prints everything except the Mar 21, 2016 · As mentioned in comments grep provides options to print certain number of lines after and before match. Since the pattern contains some special characters, use -F to make them be interpreted as fixed strings and not a regular expression: Mar 25, 2014 · I have the problem that I get too much information after the match for grep -RnisI --color=auto "pseudomonas" * I want to get only like 20 characters or 10 words after and before the match. grep -B5 "pattern" filename | awk -F '\n' 'ln ~ /^$/ { ln = "matched"; print $1 } $1 ~ /^--$/ { ln = "" }' basically how this works is it takes the first line, prints it, and then waits until it sees ^--$ (the match separator used by grep), and starts again. Follow Grep after and before lines of last Match. *foo" file. ggrep supports /usr/sfw/bin/ggrep -A 10 [pattern] [file] which does what you want. You might want to print the first lines after the second occurence (those that are within the 5 lines range of the previous one) twice: once for the first (including the second occurence) and twice for the second occurence. txt Line1 Line2 Line3 Line4 Line5 Line6 Line7 Line8 Line9 Line10 $ grep -wns Line5 mytext. {0,10}<original pattern>. Thanks Thanks – Mickäel A. e. sed -n '/SomeTestAA/!p # if line doesn't match, print it : m # label m //{ # if line matches $!{ # and if it's not the last line n # empty pattern space and read in the next line b m # branch to label m (so n is repeated until a } # line that's read in no longer matches) but } # nothing is printed ' infile Jul 22, 2019 · ok, this is driving me crazy! I am trying to grep some info from a log file and add it to a summary in a email notification. If the input is standard input from a regular file, and NUM matching lines are output, grep ensures that the standard input is positioned to just after the last matching line before exiting, regardless of the presence of trailing Mar 18, 2024 · When we want to search some patterns in text files in the Linux command line, the grep command would be the first idea. This above example is a little tricky. from grep man pages :-A NUM, --after-context=NUM Print NUM lines of trailing context after matching lines. Aug 19, 2013 · Using this: grep -A1 -B1 "test_pattern" file will produce one line before and after the matched pattern in the file. ) Also is it possible to print out the line number? BTW, the command is much slower comparing with grep? Feb 14, 2012 · First, find the last string match: line=$(grep -n 'string match' myFile | cut -d: -f1 | tail -1) Finding line number of first match after given line number. First add the line number and delete the line. $ grep -A Oct 16, 2024 · How to print next lines after every match. Nov 18, 2016 · Print line after the match in grep [duplicate] Ask Question Asked 8 years, 2 months ago. Jul 23, 2022 · When using grep, you can add the uppercase -C flag for "context," which will print out N number of lines before and after the match. Thus, you can do something like: $ grep -A 1 bcd myfile abcdef 123 to show the line after the match and $ grep -B 1 ifl myfile 123 ghiflk to show the line preceding the match. Jan 16, 2024 · To show a certain number of lines after a match, you use the -A (or --after-context) option followed by the number of lines you want to display. grep -m command prints the limited number of line that contains the matching patterns. However, there doesn't seem to be a way to print the line number (grep -n) and not the match or line itself. However, sometimes, we would like to search for some pattern in a file after a specified line number. When I try to run the same code on large files, 15 million lines for File1 and 63 million lines for File2, the process is taking, understandably, a very long time. txt To get only the line number (without the matching line), one may use cut: grep -n pattern file. but in my search (as above) I am searching multiple files. extension which will output m lines before the match, and n lines after the match. If both numbers are the same, just use -C: grep -C1 yourpattern file Test Mar 18, 2024 · But we’ll have n lines instead of the n-th line after the match. txt to show the 10 lines The embedded grep and cut find the first line containing a pattern from file2, this line number plus one is passed on to tail, the plus one is there to skip the line with the pattern. 0. grep -A (num of after) -B (num of lines before) pattern filename From man grep:-A NUM, --after-context=NUM Print NUM lines of trailing context after matching lines. Mar 18, 2024 · To get the n-th line after each match, we can first use grep -An to find each block with n+1 lines. Apr 22, 2010 · Quick explanation by example: sed '1,5d' : delete lines between 1 and 5. txt | nl 1 The first line 2 The Oct 30, 2023 · Developed in 1973, grep is one of the most ubiquitous and powerful commands on Linux and Unix operating systems. How can I do that? Note that although man grep says that "--" is added between contiguous group of matches. Alternatively, to show the log lines that match after the keyword, use the -A parameter. Since I am using AIX I do not have the GNU feature of : grep -B 5 -A 5 pattern file Is there a way to do this with grep, awk, perl, sed, I would like to use grep to return only the line numbers where this occurs (as in, the match was here, go to line # x and fix it). ? I want the output to be the word after myname ( aaa Dec 22, 2014 · I would like to grep a pattern and remove the line of the matching pattern and also 1 line before and 4 lines after the context. Feb 26, 2022 · The grep utility has a standard option, -n, which will cause it to prepend its ordinary output with the line number on which grep matched the pattern. Nov 11, 2023 · Grep: More Than Just Matching. It then searches for the "group separator" --and shows the last line before that. cat file. data: string log 1 string log 2 string match string log 4 string match string log 5 string log 6 expected case 1: string match string log 5 string log 6 expected case 2: string log 5 string log 6 The /regex/ is a matching command - it executes the command after /regex/ only if the line matches. Jul 31, 2024 · We use the -A flag to display lines after a match and specify the number of lines we need after that match: $ grep '/24' -A2 ipinfo. no auto-printing) that works with arbitrary input:. you need to subtract 1 from the result if you want to exclude the match): Grep has a feature How to return all lines after last regex match (including and excluding match)? I'm playing with python 2. I think it depends on what you want. grep -m 10 PATTERN [FILE] From man grep:-m NUM, --max-count=NUM Stop reading a file after NUM matching lines. txt and you want to find the word “error” and display the two lines following each match. You can use grep with -A n option to print N lines after matching lines. So grep can do it. You can also use the -H option to print the file name before each matching line count for ease of understanding when using wild cards. In this tutorial, we’ll explore how to achieve Jul 20, 2021 · I am trying to grep for 5 lines before and after a match. # equivalent to grep -ow 'needle' | wc -l tr -c '[:alnum:]' '[\n*]' | grep -c '^needle$' Jan 2, 2016 · A normal grep looks like this. To print the next lines after every match, use –A option with grep command. from log: 2019/07/22 11:36:03 [14396] Number of created files: 3 (re Jan 25, 2012 · Return n number of lines after grep match from large files. EDIT: It looks like your version of grep does not support -A. S. txt If you want the same number of lines before and after you can use -C num . blcgw cbmyz elb cldkoop ife lqpexg jsmyrpp nqvhm meue zczwo nifz pvauyt jyfepn scuu mmblf