Grep consecutive lines. I think it depends on what you want.

Grep consecutive lines And -C in grep to add lines both above and below the match! Jul 24, 2022 · Using pcre2grep Instead (Perl-Compatible grep) grep is a command line text searching utility that is able to find patterns and strings in files and other types of input. So far I have been trying: I needed to find all the files that contained a specific string pattern. these 2 lines are consecutive. May 30, 2012 · I like awk for its flexilbility (and especially in readability compared to sed for compilcated jobs), but I don't like one-off (nonce) scripts, as well as the fact that my measurements indicate that awk uses about 5 times as much CPU and 5 times as much wall clock time as most members of the grep family for the similar tasks (however, cgrep does use more system time, about twice as much). Mar 16, 2012 · @Prometheus any line that has more than two consecutive spaces will, by definition, have two consecutive spaces, so this command will find them as well. txt Line1 Line2 Line3 Line4 Line5 Line6 Line7 Line8 Line9 Line10 $ grep -wns Line5 mytext. *\n, we direct grep to match any line inside the log file that starts with Dec 24 until the end of the line, followed by the next immediate line that starts with Dec 25 and ends with a newline. Dec 29, 2012 · using "grep" to print the lines where the same sequence of 4 or more consecutive characters comes in at least 3 times Hot Network Questions Do the twin primes occur approximately exponentially often with respect to their position in the twin prime sequence? Nov 30, 2017 · In my infile I need to match two consecutive lines (mandatory), so to have "DET" in line n and an "NN" in line n+1. But the above will print the whole line. *\n. py' | xargs grep -e 'YOUR_PATTERN' But if I need to find patterns that spans on more than one line, I'm stuck because vanilla grep can't find multiline patterns. *" tho when I try to do: Jul 3, 2021 · So you can write your grep instruction as: grep -i -E "$1[[:blank:]]+$2" infile "infile" contains the content you want to process. How could I do? Thank you so much. Mar 18, 2024 · Learn the basic differences between the BRE and ERE syntax and explore using grep and egrep to find the words that contain n consecutive characters. *def' . these 2 lines must both exist, and 2. txt |cut -d' ' -f1) aa. See also the -B and -C options. See also the -A and -C options. $ grep -Pzo "(?s)^(\s*)\N*main. For instance: grep -ilZ "not" file. The default is 2 and is equivalent to -A 2 -B 2. grep has many options. txt -A 2 5:Line5 6-Line6 7-Line7 Other related options: Print N lines before matching lines Feb 23, 2022 · I need to create bash command which will echo those lines out. *pat. *?{. txt I have "I am not sure". Oct 30, 2013 · There is a straightforward way to do this using grep. KEY 4048:1736 string 3 KEY 0:1772 string 1 KEY 4192:1349 string 1 KEY 7329:2407 strin Jul 27, 2017 · You could use the grep options -oE, possibly in combination with changing your pattern to ". *' -e'good food' -e'bad food' -e'-': only keep the lines that contain a "city line", a "food line" (either good or bad), or a "separator line" (the food line expression could be better, I know), the -x argument to grep will make it return a line only if the whole line matches the given expression (incidentally, this first stage grep -B num Print num lines of leading context before each match. Mar 25, 2014 · I am looking for two consecutive lines matching a certain pattern, say containing word 'pat' using sed and have noticed that I am able to detect it sometimes with this command: sed -n 'N; /. The above should return: 2999 1245 8765 2323 # [9][9][9] meets the requirement 4545 1213 1332 6543 # [3][3] meets the requirement 1234 4567 6789 0124 # [4][4] over the space separated still holds The last line does not match. Dec 5, 2013 · grep -x -e'city-. Mar 16, 2018 · When the -c or --count option is also used, grep does not output a count greater than NUM. For example: $ cat mytext. txt | xargs -0 grep -il "sure" In file. You will get --lines between your context, and can use an inverted match -v to remove them. txt user2 user5 user7 user8 user9 In reality we grep the file for all the names marked as ok, and then we use these names as a pattern to be excluded from the same file in order to get "not ok" logins. Right, the basic pattern format by grep has difficulties to understand the \n (new line) as the input is matched line by line. The difficulties with grep. 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. *){1,}def' file Or use pcregrep (provided by the PCRE project ) which by default uses the PCRE regex capabilities. Matching Across Multiple New Lines With grep Handling multi-line matches is something grep struggles with. Ask Question Asked 11 years, 11 months ago. The first solution that comes to mind is using find piped with xargs grep: find . txt | grep ". Jun 16, 2011 · Print N lines after matching lines. * Some consecutive lines have the same pattern and I need these two lines plus the next line. Jul 3, 2019 · A much more simplified version of grep in the --null-data mode (-z) would be to use a greedy quantifier to match any number of new lines as grep -ozP 'abc(. c Explanation:-P activate perl-regexp for grep (a powerful extension of regular expressions)-z Treat the input as a set of lines, each terminated by a zero byte (the ASCII NUL character) instead of a Jan 5, 2013 · Grep consecutive lines with duplicates field values. (Actually, it now operates on pieces separated by the zero-bytes, which is usually absent in text files. $ grep -v -f <(grep " ok$" aa. grep -A2 "PATTERN" file | grep -v -- "^--$" Using awk: awk '/PATTERN/{c=NR+2}(NR<=c){print}' file Using sed: sed '/PATTERN/,+2!d' file Perl one-liner Sep 18, 2024 · If you get 2 consecutive lines of foo it'll delete them but then if you get a 3rd line of foo elsewhere in your input it'll delete THAT line too despite it not having a duplicate consecutive line. So, using grep -m 1 "pattern" files you can limit the amount of results per file to one. You can use grep with -A n option to print N lines after matching lines. . {0,10}" in order to see some context around it:-o, --only-matching Show only the part of a matching line that matches PATTERN. I think it depends on what you want. *" print lines with spaces: cat file. -iname '*. Viewed 583 times Mar 18, 2024 · Now, when we combine this regular expression with Dec 25. – Ernest Friedman-Hill Commented Dec 5, 2020 at 2:06 Aug 19, 2024 · Matching only lines that have consecutive matching integers. A better tool grep -A num Print num lines of trailing context after each match. Apr 7, 2020 · There are 2 criteria: 1. Therefore, we can see two different entries from the log file that matched this pattern. Apr 7, 2020 · We want to check whether the ~/. The key is to make it match \n. Spaces between do not matter. print lines with dash: cat file. <infile> the DET apple NN the DET XXX XX fish NN the DET YYYY YY banana NN tree NN the DET bottle NN <outfile should be> the DET apple NN the DET bottle NN I'm using the following command @Ruchi: But Dennis' answer doesn't print all 5 lines following the second occurence in this case. Currently I'm using cat piped with grep but I can't get both spaces and dash into one search and I had problems with checking for multiple spaces. *\s. grep -B num Print num lines of leading context before each match. Most matches will match on one line only, but it's often useful to match across multiple new lines. *?^\1}" *. grep -C num Print num lines of leading and trailing context surrounding each match. ) Jun 16, 2011 · Use the -A argument to grep to specify how many lines beyond the match to output. )\1{3,}' input_file If you do not need the chains but only line where g appear 4 or more Jul 24, 2022 · grep is a command line text searching utility that is able to find patterns and strings in files and other types of input. When the -v or --invert-match option is also used, grep stops after outputting NUM non-matching lines. ble : 1 - etc blf : 1 - etc blg : a - etc Is it possible to extract this lines with grep, sed or any other tool? Sep 15, 2010 · Without the need to install the grep variant pcregrep, you can do a multiline search with grep. It is not the Perl -P which does the trick here, but the -z which lets grep operate on the entire input at once instead of line by line! Try grep -z 'abc. If you were going to use 2 scripts like that then the first one should print line numbers instead of line contents and then second one would skip Dec 21, 2017 · you should change your grep command in: grep -E 'g{4,}' input_file # --> this will extract only the lines containing chains of 4 or more g if you want to take all the lines that contain chains of 4 or more identical characters your regex become: grep -E '(. See the documentation from the grep man page. I have a text file with the following format. Modified 11 years, 11 months ago. But we don’t need to stop here. {0,10}<original pattern>. There are 2 criteria: 1. Sep 15, 2015 · I have checked this topic to find two words in a text file: How to combine two search words with "grep" (AND) But now I'm trying to know if it's possible to check when they are consecutive in the file. *-. bashrc file contains 2 consecutive lines (okay to assume they are not at the beginning of the file): export PATH=$GOPATH/bin:$PATH. And use -B n to grep lines before the match. The first line is the "KEY" and the second line is the "VALUE". -E is the Extended Regular Expression flag [[:blank:]] represents a space or a tab + means that what comes just before in your ERE must be present one or more times. bxfw lyarxv rlyk mraeau fzxceu xiof qxobg ytoas tfgo qgxtcv