Shell script to find the lines containing a number in a file. You can use grep for this.

Shell script to find the lines containing a number in a file Even the ownership or group may change if the sed -i script is run by a different user (who has appropriate RW access to the file and dir, of course). 0. log that should work. So, you can do: awk 'END{print NR}' file Of course, that is a bit silly when there's a program designed specifically for this: wc -l file Jul 10, 2015 · Get the last line number of the file, also known as the total line count. conf: sed -i '2,4 s/^/#/' bla. Note that line numbers are 1-indexed. 8 GNU. Mar 21, 2016 · I'm using grep to find files within a directory, containing a set of words. \{80\}/p' file Except for the perl ¹ one (or for awk / grep / sed implementations (like mawk or busybox) that don't support multi-byte characters), that counts the length in terms of number of characters (according to the LC_CTYPE setting of the locale Dec 16, 2023 · Here are a couple of ways, both of which assume you want to start deleting two lines after a line that contains nothing but the exact string Line 5:. ; The two parts of the Jun 24, 2016 · I need to find if any lines in a file begin with **. grep -f input_file source_file > output_file Let's say your source_file is Mar 18, 2024 · We can use grep to extract lines containing a specific number of digits:. -type f -iname "*SNAPSHOT. As you can see, once the script gets executed, it's output: Hello, World is shown in the terminal. txt having: this is foo test and this is bar test Now the output of grep -n "test" file. In Perl. Change a word based upon the file content. Now, we want to detect if there are lines that Dec 10, 2015 · Adapted from Find any lines exceeding a certain length any of the following will work to find lines longer than 100 chars. grep -lw Mar 15, 2015 · -n, --line-number Prefix each line of output with the 1-based line number within its input file. With the -c and -v command, this will count how many times this does not match a particular pattern. Is there a simple way to find out the last line executed in a bash script? 0. x. \{100\}' file perl -nle 'print if length$_>99' file awk 'length($0)>99' file sed -n '/. The other 2 answers where to long for me. txt so it can be like file-1. perl Jun 30, 2016 · I also experimented with a Python script using two strategies: searching for all keywords line by line, and searching in whole file keyword by keyword. Tac is simply the reverse of a cat and simply prints the file in reverse order. \{80\}' file perl -nle 'print if length$_>79' file awk 'length>79' file sed -n '/. Using GNU sed with -s, as above, fixes this. How can I do it? Use grep with the -n flag. 7 command. This will break hard links. For example, the file contains a short poem by John Donne. If you use the -c command that will do so. 4 power. I cannot figure out how to do it because * is interpreted as a wildcard by the shell. This simple one works: sed -n '/file/=' temp. then you can get the files using find command like this :-. Line by line keyword matching finished in 60 seconds. So you can do all sorts of calculations in your shell script to pick specific words (like ranges or every third word or for-loops ) HTH. In addition, we’ll also learn to extract the lines containing N numbers from a given input file. x file. sed -n '/^$/=' file We use the -n option to Feb 8, 2016 · How many lines are in each file. You can use grep for this. 5 linux. -name "*. My pattern contains slashes so I wanted to add custom delimiter. Its line counter does not reset between files. For example, if you have a file named file. #!/bin/bash awk -F: -v keyword="$1" '$1 == keyword {$1=$1; print}' myfile. txt | grep '^c' --line-number 3:cddefefef // this is the line that I need its line number 10:cat // added to illustrate getting the first occurence vs. csv The trick here is reassigning the value of one of the fields forces awk to recalculate $0 using the output file separator. Visit Stack Exchange May 9, 2014 · To comment lines 2 through 4 of bla. So, each time I find a line matching pattern, Add line to 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. out obviously doesn't work. grep -nr "the_string" /media/slowly/DATA/lots_of_files > output. (I also need to know if this line ends with a ) but have not attempted that yet). But it was slower than just using grep, finishing in 33 seconds. If the current line number equals the last line number, then do something. sh running the shell script. txt: $ grep -n "test" file. The various dialects of shell scripts are considered to be scripting languages. 3. txt You can also pipe data to wc as well: $ cat /dir/file. Mar 23, 2020 · A shell script is a computer program designed to be run by the Unix shell, a command-line interpreter. First use Jun 24, 2022 · grep can print the line number of a match with -n or --line-number so you can use that. txt but when I want to add delimiter to first example it doesn't: sed -n '|file /etc Mar 4, 2019 · Maybe slightly out of context (though similar), as it concerns numbers aka (single) digits, but this supersimple awk-rule helped me out a lot to keep only those lines of a file with less than four times the high digits on each line: Jan 15, 2025 · find dirname ! -name dirname doesn't work if there are other directories within that are named dirname. Loop through the file, keeping track of the current line number. 6 shell. The second strategy was faster in my case. It performs various operations on a file, such as Jul 24, 2014 · Grep has a feature that can count the number of times a particular pattern is found. It's better to use find dirname/. txt. 168. – Oct 20, 2020 · For an example consider a following file: $ nl test. Also I Oct 24, 2016 · Bash script to find maximum number of a certain character (". A script that sets up the environment, runs the program, and does Jul 31, 2023 · Find line number of a specific string or substring or word from a . The -l option tells it to count lines. (and when I say "line(s)", I really mean "record(s)" because awk is capable of processing more than just plain-text files with newline-separated records) A bash script for taking two lines in a text file and forming columns along one line. But grep search lines containing these words, what I want is grep to show me the files or file containing all those words even in different lines. Use. Apr 27, 2017 · Let say your file is following this pattern file-1. For example: Jan 16, 2025 · I am trying to print the matched line and the 4th line from the matched line (line containing the expression I am searching for). Jan 18, 2025 · As in example I'm trying to get line numbers which contains the pattern. Apr 14, 2015 · I've got a file which contains some amount of lines, I want to look for a specific string, and if the file contains it, then I want to print a different line from the same file. txt 1 linux 2 bash 3 shell 4 power 5 linux 6 shell 7 command 8 GNU First use the -n option to print line numbers for a matching string shell: $ grep -n shell test. 0-SNAPSHOT. txt 2:foo test 4:bar test Nov 23, 2019 · I've tried using grep -r to search in the sub directories and managed to find the lines. txt etc. the special variable $. 2. Lets say you want search in the file source_file , and the second file where you have the lines that you want to search from is input_file. txt" It will give you all the files which ends with SNAPSHOT. txt file in Python Finding the line number of a specific string and its substring is a common operation performed by text editors or any application with some Dec 4, 2023 · Count and Display Line Numbers of a File Using sed The sed command, or stream editor, is an essential command-line tool for text manipulation on Linux. $ cat sample. , discard the first two values) from each line in a text file containing, for example, the following values? 1 1112 0 1 2 2 1111 0 2 Jan 30, 2013 · grep '. wc -l <filename> This will output the number of lines in : $ wc -l /dir/file. 1-SNAPSHOT. txt Mar 18, 2024 · In this tutorial, we’ll learn different ways to find a line containing N digits using the grep command. txt Using delimiter for string replace works too: sed 's|file|gile|' temp. wc -l counts the number of lines, file names can be made of several lines as the newline character is as valid as any in a file name. . Typical operations performed by shell scripts include file manipulation, program execution, and printing text. txt or file-1. 2. Thanks also go to previous answers, which I expanded on after some experimentation to handle both fn based and non fn based scripts. txt" -exec cat {} + | grep -ic abc Grep -c will do the total count for you - something I didn't find in SigueSigueBen's answer, which contains unjustified calls to xargs, imho. ") in any single line of a file 2 Find lines in one "key - value-list" file that contain data fields not mapped to that key in a second "key-value" file Sep 6, 2016 · Your command: grep 'PATTERN' | sed -n '7p' yyyymmdd*. Just use position numbers. only from the first file). Common Errors in Running Shell Script. To run the shell script after checking all the permissions, use the command:. grep -i "^2" test. txt 32724 /dir/file. Jun 18, 2015 · You can use grep. Jan 16, 2025 · Stack Exchange Network. For example: Jan 16, 2025 · I want to search for a string in a file, and the output should give me the line number and line containing that string. Shell Script to find out the sum of the given numbers using command line argument PROLOG PROGRAM TO SPLIT A LIST IN TWO LISTS SUCH THAT ONE LIST CONTAINS NEGATIVE NUMBERS AND ONE CONTAINS POSITIVE NUMBERS Aug 24, 2023 · To get the line numbers into an array, use process substitution along with the bash built-in mapfile (a synonym for mapfile in bash is readarray but you get much better & more detailed help in bash from running help mapfile than help readarray). \{100\}/p' file chose your preferred method and pipe it through grep if Jul 22, 2016 · The permissions on the file may change, due to the umask the temp file was created with. 5. grep -i "^**" test. 3 shell. bernie Jan 17, 2025 · How can I extract the third value and all subsequent ones (i. txt 3:shell 6:shell As a Mar 18, 2024 · As the output above shows, we’ve used the cat command with the -n option to show the file content with line numbers. txt | wc -l 32724 $ curl google. com --silent Apr 30, 2017 · The special variable NR holds the current line number. Array indexes are positive integers. Oct 20, 2020 · 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. ; The sed will only pick up the 7th line from the complete set of input files (i. find . 2 bash. txt and then you can use it to do your work. grep -r -e $3 $1 gives me the lines but fails to weed out other files with different file extensions and I couldn't find a way to include $2 in the code. So if you try something like: grep -c -v 192. out works if the line begins with a 2 but . Use wc, originally for word count, I believe, but it can do lines, words, characters, bytes, and the longest line length. grep -E '^[^0-9]*([0-9][^0-9]*){N}$' sample. is the current line number. Sample Dataset and Toolset. all The problem then reduces to: Get the first line only Apr 11, 2015 · Your awk syntax is a little wrong. The replacement file will have a different inode. Whereas nl commands numbers, Aug 7, 2017 · sed will report the line number with the = command, so you can use this expression to report line numbers of empty lines (lines with nothing between ^ (start of line) and $ (end of line)):. e. /script. Example: grep -c -v <pattern> file. Dec 24, 2024 · granting permissons to execute shel script file Step 4: Run the Shell Script. Jan 16, 2025 · To count the number of all "abc"'s in the . ! -name . In this example, grep is the command used to find patterns in files, -E enables the extended regular Dec 12, 2021 · Display file contents in reverse: To print the contents of any file in reverse, we use tac or nl, sort, cut commands. Aug 24, 2023 · FNR is the line number of the current file only. conf To make the command that you wanted, just put the above into a shell script called comment: #!/bin/sh sed -i "$1"' s/^/#/' "$2" This script is used the same as yours with the exception that the first and last lines are to be separated by a comma rather than a dash. Feb 20, 2009 · Shell program to count Vowels, blank spaces, characters, number of line and symbols from a file. Once the entire file has been processed, it will hold the total number of lines of that file. Jan 18, 2025 · Don't mess around with something like "last field on this line" or a character mask etc. Jan 17, 2025 · I use the following command to recursively search multiple files and find the line number in each file in which the string is found. grep '. log Some issues: The grep has no input and will be waiting for input on its standard input stream. For an example consider a following file: 1 linux. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. txt files, use grep -c and find and - exceptionally - cat: find . for example, let's assume I have the file: aaa bbb ccc Let's say that I'm looking for bbb, and if I find it I want to print the following line (in the example, ccc). gfnifl vmxiu jif kdwfw nphr yeeq dihwrj kyeypa zmhztv zaps