Bash get line number of match. Line 3: End of while loop, which pipes in the file foo.

Bash get line number of match. 1". #!/bin/bash. user@linux:~$ sed -n 2,4p file. Line 12 is function fail {, which is somewhat less helpful. This basically answers the question How to show line number when executing bash script for users of ash or other shells without LINENO. txt:match3 file2. Apr 19, 2019 · How to return the line number of the first occurrence of a text in a file in linux? For instance, a file as follows. – user3483642 Commented May 6 at 0:54 Dec 24, 2012 · grep -n or --line-number option will do this for you. I'm having a problem with the order in which the grep output is generated. I've tried using sed but I can't seem to make it just output the match instead of replacing it with something. You will get the lines you are looking for, and you can add a "| wc -l" for the count, or concatenate the lines and use the -c option to grep (as someone above suggested). Commented Jul 27, 2018 at 16:22. . txt:match2 file2. By this way, I would get: this is line 1 192. txt | head -n 1 | cut -d: -f1)" Explained: after the grep, grab just the first line (num:line), cut by the colon delimiter and grab the first field Nov 8, 2011 · To get just the line number, it's easier to use cut than Awk, e. This is done twice. Here's a quickie for you, simply what we're doing is. In other words, find consecutive lines starting with C . . Aug 6, 2015 · I have this script: find . 12:04:56 xxxx 12:06:23 xxxx 12:09:11 xxxx 12:09:13 xxxx 12:10:12 xxxx Can anyone Sep 29, 2011 · grep -Hn - grep and print results with file name and line number of match {} \; - {} marks where the name of each file found will be substituted and the backslash- semicolon marks the end of the command to execute. 2nd file:1:string_example is there. co Dec 20, 2017 · I have a string that looks like this: GenFiltEff=7. bash. I can use another regex to extract the line numbers, but I want to make sure grep cannot do it by itself. txt && sed '/pattern/q input. 3. We can use the cat command to view the contents of this file: The file contains information about the team name, position and conference that each player belongs to. For example, to start at line 10 and print the line number and line for matching lines, use: sed -n '10,$ { /regex/ { =; p; } }' file Each of these commands launches another process within the script and so are less efficient than the pure bash method described below. 2bash. 1 this is line 4 192. But we’ll have n lines instead of the n-th line after the match. txt 123 456 789. Same as above but also print the 2 lines before and 2 lines after the line containing the string (total of 5 lines)? Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Mar 18, 2024 · We can use the grep command to search for and extract specific patterns from the contents of file. Combine with awk to print out the line number after the match: $ grep -in null myfile. @wjandrea Easier in what way Jul 15, 2019 · How to get the line number of a string in another string in Shell Hot Network Questions Does a 2. I'm trying to match some lines against regex that contains digits. The portion before and after the match will consistently vary. For your specific case, you can write: I just want to match some text in a Bash script. That is: cat file | grep 'TERMINATE' # It is found on line 534 So, I want the file Mar 18, 2024 · As we can see, this time, the command has printed the line numbers of matched lines. 123 in this case. Explanation: NUMq will quit immediately when the line number is NUM. By using the -E option, we enable extended regular expressions (ERE). I have a file with about 1000 lines. Line 2: Match a regex, echo the $line if matching the word "bird" echo that line. txt: $ grep -Eo '[0-9]+' file. – 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. The line number will be delimited from the contents of the line by a colon. 092200e-01 Using bash, I would like to just get the number after the = character. What I am currently doing is to get the line number and pass it so sed to delete this line: awk '/qr/{ print NR; exit }' test | sed -i "${1}d" test The awk part works well, but in this state, the sed part deletes all the content of the file (named test). During my testing I have to find the line number of first occurrence of a string in a file. Using Regex Inside an If Clause Explanation:-A2 means print the next two lines after the match, and -x means the pattern must match across a complete line. The default is 2 and is equivalent to -A 2 -B 2. Jul 15, 2015 · To print the line number of your match, use the -n option of grep. etc. 25: Get number in a string using bash and regular expressions. Thx! Of the 2 parts, each is true and executes on separate, adjacent iterations of the loop. You can find this information in the grep help file, which you can find by using grep --help or grep --help | less to read it more carefully. 2 I would like to get, in a bash script, all lines (with tabs) which contains, for example, the pattern "192. grep -n -F -w '27QL' file. I don't think there's a way to get grep to start on a certain line number. Nov 13, 2013 · grep has the special characters '^' to match the beginning of the line, and '$' to match the end, so if you do: grep "^hello world$" *. I have a directory in linux with approx 250,000 files I need to find count of number of files matching a pattern. -C[num] Print num lines of leading and trailing context surrounding each match. -name "$2" -print | xargs grep --colour=auto "$1" It searches for a $1 word in $2 matching files. Or get the line number from grep and use it for head. This looks like: $ grep match file* file1. txt:match file1. -B num Print num lines of leading context before each match. Is there a way to do this? May 25, 2020 · I want to delete a specific line of a file in bash. How can I make it print the line number on which the word has been fou Oct 12, 2013 · If the preferred line number is 5: sed -n '5p' filename #get the 5th line and prints the value (p stands for print) If the preferred line number is a range, e. Learn more Explore Teams Jun 16, 2011 · -A num Print num lines of trailing context after each match. txt that contains information about various basketball players. Q1b. txt. 0. However, when I do it without the Mar 12, 2015 · You can use the test construct, [[ ]], along with the regular expression match operator, =~, to check if a string matches a regex pattern (documentation). But the actaul output I want is 3 from the above output. 1. To get the n-th line after each match, we can first use grep -An to find each block with n+1 lines. txt) Total null count : 2 Is there a way to combine both steps into one command? I'm thinking piping the line number and the filename into sed and printing the line. Thanks also go to previous answers, which I expanded on after some experimentation to handle both fn based and non fn based s Jun 25, 2014 · I expect the next line to be the failing line: 14 Failed at 14: command_that_fails Now, what I get is the following output: I expect the next line to be the failing line: 14 Failed at 12: command_that_fails BUT line 12 is not command_that_fails. Use command substitution: n=$(awk '/word/{print NR}' file) I usually just want the line number of the first line that shows what I'm looking for. " So, this matches the last word after the last space through to the end of the line; ie: abc. Aug 8, 2019 · You say that you want to grep a given number of lines after a match but your code actually prints the last 1000 lines of the file to which you appended the results of grep -v auto. Each index corresponds to a part of the regular expression match Apr 15, 2021 · Bash - match line if number is within a range defined in the line. * //sm : these match modifiers are (as documented [here]): I am using bash script for testing purpose. txt Using Jun 20, 2019 · user@linux:~$ grep -A2 'e 2' file. s/\n/ / changes the newline between the two lines into a space. Also doesn't work May 15, 2012 · Use grep -n to get the line number of a match. 2 this is line 3 192. However, since we piped the tail command’s output to grep, the line numbers reported by the grep command are not the actual line numbers in the original input file. The curly braces in the (second) sed command aren't really necessary. Print data between two lines (only if "range end" exists) from a text file. Jun 5, 2015 · For the selected lines, this prints the line number (NR means Number of the Record). 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. Using find to run a command on multiple files. txt:match4 And what we want is two lines from that output: Mar 22, 2018 · this is line 1 192. How can I do it in bash? Apr 17, 2013 · I am trying to write a bash script to delete multiple lines in an ini file. Change quote style mid-string Directory of script. 1st file:1:string_example is there. # There could be any text before the following text [machine1. Case statement. Nov 7, 2017 · Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Oct 10, 2012 · @frpfarhan: It puts the line of output on the same line as its line number. If found, get the next line into the buffer (getline) and print the buffer (print). Mar 15, 2015 · -n, --line-number Prefix each line of output with the 1-based line number within its input file. txt having: this is foo test and this is bar test Now the output of grep -n "test" file. Bash provides several built-in utilities for regex, such as grep, sed, and awk. Here is a simple example on how to search a file and instead of printing a matching string to STOUT we only print a line number for a matching string. For example, if you have a file named file. txt 2:Line 2 3-Line 3 4-Line 4 user@linux:~$ Also, the same thing can be accomplished with sed -n 2,4p file. 1st Line, 5th Line: As in example I'm trying to get line numbers which contains the pattern. Print last line of text file. g. 1-5 lines: sed -n '1,5p' filename #get the 1 to 5th line and prints the values If need to get 1st and 5th line only, e. May 17, 2011 · Where NUM is the number of the line you want to print; so, for example, sed '10q;d' file to print the 10th line of file. 5" SATA HDD slot in a desktop computer? /^C[^\n]*\nC/: match C at the beginning of a line (see the description of the sm modifiers below for why this works here) followed by 0 or more non-newline characters, a newline and then another C. Get the line of last grep match in bash. Slower than 1-pass when a match does exist, unless it means you avoided swap thrashing. The final result is the list of line numbers with a match. echo -E "TestT100String" | sed 's/[0 Jun 25, 2013 · AWK display the line number of last match. Since the pattern contains some special characters, use -F to make them be interpreted as fixed strings and not a regular expression: Jun 24, 2022 · You need to tell grep about your “that should be in the start of a line” constraint, by anchoring the match to the start of a line with ^: trimLineNum=$(grep -m1 -n -- '^c' "${varFileLog}") Then post-process grep’s output to only keep the line number: trimLineNum=$(grep -m1 -n -- '^c' "${varFileLog}") trimLineNum="${trimLineNum%%:*}" Oct 20, 2020 · Match string and print a line number only using Linux shell. Assigning the line number to a variable. 16 "this is a simple comment with a line number" if the number of this line in the source file is 16. This simple one works: sed -n '/file/=' temp. Sep 16, 2012 · user@box:~$ grep -B 2 my_regex out line 3 line 4 line 5 my_regex user@box:~$ Grep exact matching lines and 2 lines before and after. d will delete the line instead of printing it; this is inhibited on the last line because the q causes the rest of the script to be skipped when quitting. Thus, {print NR, $0} would print the line number followed by the line itself, $0. Line 1: While reading file into variable line. I want the part of my file after the line which matches my grep statement. 1 Feb 14, 2012 · I have a file like this: string log 1 string log 2 string match string log 4 string match string log 5 string log 6 I need to get all the lines after the last string match. 2 this is line 4 192. Of course, we can get the actual line numbers through this calculation: LINE_NO_BY_GREP + 6 – 1. Line 3: End of while loop, which pipes in the file foo. I suppose if the point was to print any line after any match that you would want to reverse the order (would behave more like grep -A1). Jan 9, 2009 · Given a filename in the form someletters_12345_moreleters. The -n switch to grep prepends any matched line with the line number (followed by :), while the second command uses the colon as a column separator (-F ":") and prints out the first column of any line. user@linux:~$ grep -nA2 'e 2' file. 1 this is line 5 192. Also consider using the manual page: man grep May 21, 2017 · Now available on Stack Overflow for Teams! AI features where you work: search, IDE, and chat. txt Line 2 Line 3 Line 4 user@linux:~$ I can also print out the line number as well with grep -n. 2. Here’s how you can use regex with these utilities: 1. text. Sep 6, 2016 · The awk variable FNR will be the line number of the current input file. txt to verify a match before running sed. 1 this is line 2 192. ext, I want to extract the 5 digits and put them into a variable. Oct 25, 2014 · This bash command will print the file name along with line number of the lines which contains the string "string_example". Or, with GNU sed: sed -n -s '7p' file* The GNU sed option -s will make the internal line counter reset between input files (this is a GNU extension to standard sed) Oct 15, 2022 · you can use cat -n to display the line numbers and then use awk to get the line number after a grep in order to extract line number: cat -n FILE | grep WORD | awk '{print $1;}' although grep already does what you mention if you give -C 2 (above/below 2 lines): grep -C 2 WORD FILE May 2, 2020 · Command line to match lines with matching first field (sed, awk, etc. For that, use sed. Here is the sample output for better understanding. The matched line will be suppressed if we pipe this result to grep -v ‘pattern’. I would like to use grep to return only the line numbers where this occurs (as in, the match was here, go to line # x and fix it). Do whatever actions you need here, in this if statement. Aug 13, 2018 · I decided to use the following, which includes a stack trace as list of fns [list of line numbers] if the script is in a function or the script line number otherwise. Bash version 3. Try this: grep PATTERN FILENAMES* | tac | sort -u -t: -k1,1 Explanation: Grep will return one line for each match in a file. For an example consider a following file: 1linux. If you want to start from the last match instead of the first match it would be: tail -n +$(( 1 + $(grep -n -f file2 file1 | tail -n1 | cut -d: -f1) )) file1 Sep 17, 2011 · Ah, I see now. Or awk: awk '$0 == "UNIX" {getline; print; getline; print}' file Explanation: Search for UNIX in the line ($0=="UNIX"). Suppose that we have a file named athlete_data. txt 2:foo test 4:bar test Jul 3, 2012 · Is there a bash command which counts the number of files that match a pattern? For example, I want to get the count of all files in a directory which match this pattern: log* Oct 18, 2020 · For huge files (a large fraction of your total RAM), if you aren't sure a match exists you might just grep -q input. awk print first line and last line of instance. user@box:~$ grep -C 2 my_regex out line 3 line 4 line 5 my_regex line 6 line 7 user@box:~$ Reference: manpage grep-A num --after-context=num Print num lines of trailing context after matching lines. lineNum="$(grep -n "needle" haystack. txt: $ grep -n "test" file. Getting the line number of the nth match Jun 16, 2011 · Use the -A argument to grep to specify how many lines beyond the match to output. You can change this to print any information that you are interested in. 168. ) In bash, how to capture stdout and the exit code of a command when the -e flag is active Feb 11, 2024 · To access the indexes of the BASH_REMATCH array in bash, you simply refer to the specific index number you're interested in. It need a way to match lines to a pattern, but only to return the portion of the line after the match. Oct 2, 2020 · the * means: "match 0 or more instances of the preceding match pattern (which is [^ ]), and the $ means "match the end of the line. 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. I tried using following command : ls -1 20061101- Sort has a uniq option that allows you to select just one line from many. 1st file:2:string_example is not there. I have an ini file configured in the following manner. txt Line 2 Line 3 Line 4 user@linux echo_line_no "this is a simple comment with a line number" Output is. See also the -B and -C options. If it is 7, the line is printed. via regular bash "indexed" arrays and array indexing Apr 28, 2024 · In Bash, Regex can be used in multiple ways for operations like finding a file extension, matching substring, and finding patterns without the original string. May 31, 2024 · Example: How to Use grep to Get Line Number of Match. So to emphasize the point, I have a filename with x number of characters then a five digit sequence surrounded by a single underscore on either side then another set of x number of characters. Anything more to add? Sure. cut -f1 -d: – wjandrea. I have tried "awk" and "grep" both, but non of them return the value. I am new to linux. However, there doesn't seem to be a way to print the line number (grep -n) and not the match or line itself. More clarity is needed on what you are trying to do. N appends the next line to the one currently in the pattern space. Mar 18, 2024 · This is because grep -An will output n+1 lines: the matched line + n lines after it. 5" SATA SSD fit into a 2. txt | awk -F: '{print $2" - Line number : "$1}' example two null, - Line number : 2 example four null, - Line number : 4 Use command substitution to print out the total null count: $ echo "Total null count :" $(grep -ic null myfile. My pattern contains slashes so I wanted to add custom delimiter. 1. See also the -A and -C options. mbre pccoun woxqak ibedls dws aqocd ibplx twvs mvnilz owlgcqgy