grep is a command-line tool for searching text patterns in files

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extract lines according to a particular column

I have a CSV file like CK,ck XYZ,xyz,xyzs ABC,abc,abcs PQR,pqr,pqrs LMN,lmn, IJK,ijk, I have to check if something is written in column 3 except whitespace, then display the whole line.the output ...
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how to make alias to make grep command shorter [duplicate]

In my coding, I always do grep -rnIi "abcabc" . --color But, how to make an alias that can let me type only one word with my search string? Is that possible?
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Printing lines from one file if part of them appears in another. Both files are millions of lines long

I have two files, let's call them 123.txt and 789.txt. 123.txt is 2.5M lines long, and 789.txt is 65M lines long. Is there any way to use grep or similar to keep any lines from 789.txt that contain ...
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How do you get fgrep to find the literal “--help”?

fgrep --help | fgrep "--help" returns just the whole fgrep --help, how do I return just the lines that have the literal "--help" in them? The quotes don't do anything, nor does \-\-help.
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grep command giving error

I am using grep to filter out the contents on some patterns(genes in my case). For more info,here is the earlier link. Find pattern from one file listed in another My code(should work) but is not. ...
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difference between .* and * in regular Expression

I've a file named "test" that contains linux Unixlinux Linuxunix it's linux l...x now when i use grep '\<l.*x\>' , it matches : linux it's linux l...x but when i use grep '\<l*x\>' ...
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Find files containing string in file name and different string within file?

I would like to (recursively) find all files with "ABC" in their file name, which also contain "XYZ" in the file. I tried: find . -name "*ABC*" | grep -R 'XYZ' but its not giving the correct ...
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Search for a precise number with grep

I am trying to look for lines in a file that have one or more instances of 1234, but no other numbers (non-digit characters are allowed). Any other number should cause the line not to match. Valid ...
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Why is this command not working: “ps aux | grep xscreensaver”

I didn't see any hits about this on google, so I'm asking you: I just tried to run this command in an ssh session, local is Debian Wheezy KDE, remote is Fedora 21 Gnome: ps aux | grep xscreensaver ...
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How to search files where two different words exist?

I'm looking for a way to search files where two word instances exist in the same file. I've been using the following to perform my searches up to this point: find . -exec grep -l "FIND ME" {} \; ...
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What params do I pass to grep to return only file names?

I'm trying to use grep to find a specific piece of text in a bunch of files on my web server. No problem, except that it returns way more information than I want! Ideally it would just return a list ...
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How to replace m part of Lines with n part of Lines?

I have a file "test" like this: RewiteEngine On RewriteCond %{REMOTE_ADDR} !^192\.168\.1\.7$ [NC] RewriteCond %{REMOTE_ADDR} !^192\.168\.1\.8$ [NC] RewriteCond %{REMOTE_ADDR} ...
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GREP / SED or AWK: Print entire paragraph in a file on pattern match [duplicate]

I have a file with hundreds of paragraphs of around 15 lines each. I need to search for a pattern, say Occurance: 1. If this pattern is found in the para, I need to print the entire paragraph. Note ...
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Count lines matching pattern and matching previous line

I want to count the number of times that a role is successfully deleted. The problem is that one line of the log file will show that the script is about to delete the role: Prepare to remove role X ...
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How to tell “grep -w” what characters make up “words”?

$ printf 'asf .test. afd\nasaf foo-test asfdads\n' asf .test. afd asaf foo-test asfdads $ printf 'asf .test. afd\nasaf foo-test asfdads\n' | grep -w test asf .test. afd asaf foo-test asfdads ...
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grep for multiple regexes, and count the number of occurences

Say, I have a file, and multiple regexes have to be searched in it and the number of matches for each regex has to be counted. Thus, I cannot combine the patterns: grep -Po ...
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To grep 20 characters after and before match

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. What ...
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What is the python equivalent of grep -v?

I like grep -v. I use it all the time. But I am also doing some text processing in python, and there is one crucial thing that I lack. Usually, I use grep -v to take extraneous stuff out of text. ...
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Looking for a Java class in a set of JARs with find, unzip, grep

I was trying to find the JAR containing a Java Class. JARs are in zip format. My first attempt was: $ find -name "*3.0.6.RELEASE.jar" | xargs -l1 unzip -l \ | grep stereotype.Controller ...
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How can I match the page break character in a regular expression?

Nano calls it ^L, but of course, typing something like $ grep -v "^\^L" file doesn't work. Its unicode codepoint is 000C. How can I match it in a regular expression?
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remove lines where a field's value is less than or equal to 3 - sed or awk?

I need to remove every line that has a value of 2 or less in the 8th field (column). My data looks like this: 12-31 Airport 189 379 41 49.70946503 -124.91377258 2 2880 30.8 01-01 ...
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How to “grep” for line length in a given range?

NOTE: This question is the complement of this Q&A: How to grep for lines shorter or longer than specific thresholds? I need to get only the lines from a textfile (a wordlist, separated with ...
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Capture in shell variables the arguments after a command (between brackets)

Suppose I have a file that contains, among many other things, \command{arg1,arg2,arg3} (arguments been paths, expressed with /, ., characters and numbers) But that a user can as well call it ...
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Why does a grep reboot the machine?

On a RHEL 6.5 Desktop, if I use: sudo grep -r foo /* my desktop reboots. Q: Why?? How to debug this? It's the third time my Desktop reboots because of this :D
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A shell script to write selected fields to a single line

I have a log file trace.log which prints the time stamp, thread name and Transaction method and transaction ID as below. 2014-01-23 15:50:41,724 [catalina-exec-35] INFO TRANSACTION getConnection ...
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recursive search for a pattern, then for each match print out the specific SEQUENCE: line number, file name, and no file contents

What I am after is almost exactly the same as can be found here, but I want the format "line number, separator, filename, newline" in the results, thus displaying the line number at the beginning of ...
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Read log file between two dates

I have to read log file between and my question is how to get only the text in the file wich is between two dates using unix commands? Every line contain date and I want to get the text in the file ...
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How to find the total number of occurrences of text and files with find command

I am trying to run the find command to find the total number of occurrences of a particular text string and also the number of files which has this text string. What I have right now is this command. ...
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Exclude files that have very long lines of text from grep output

I often run grep commands to find things in my code, but the problem with web projects is that there will often be compressed JavaScript and CSS files which create one huge line of text, so that if a ...
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Robustly segmenting a csv file containing noisy data

Say I have a csv file with these columns: timestamp,cpu,memory An example of the shape of the actual data would be this chart: Having the data visualized in this way, it's easy for the human eye ...
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Pattern matching across multiple lines

What is a quick and easy way to validate if the pattern "301 domaname.com 200" is present within BASH when spread across multiple lines of output? I was using something like the following: awk ...
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Grep word boundaries

Accorging to GNU documentation: ‘\<’ Match the empty string at the beginning of word. ‘\>’ Match the empty string at the end of word. My /etc/fstab looks like this: /dev/sdb1 ...
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Scrabble helper in bash

I'm trying to make a scrabble helper in bash, which when given a list of characters, finds all the words in the /usr/share/dict/words file. For example, when given the letters a,c,r,t The word cart ...
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Delete last character in a word but only if the character is there - in bash

How to remove last character only if it's there? input: OpenOffice.org/m openOffice.org/ozm Pers. Pfg. phil. Prof. resp. Roonstr./m roonstr./ozm desired output: OpenOffice.org openOffice.org ...
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Escaping of meta characters in basic/extended posix regex strings in grep

Is it possible to escape all meta characters of a string inside a variable before passing it to grep? I know similar question has been asked before on SE (here) and also a good explanation here, but I ...
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Search for a text in Linux but don't display the complete line in results

I'm using grep to do this, like: grep someText file.log But this returns the complete line in results. If someText is found in the middle of a line I don't want to ouput the whole line, just the ...
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Behavior of grep -o on OSX

On Linux, when I do echo foo | grep -o '^.' to get the first character, it prints f as expected. (I know, | cut -c1 would probably be faster.) But on OSX, doing the same results in 3 matches (3 ...
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How does grep decide that a file is binary?

I have a large utf-8 text file which I frequently search with grep. Recently grep began reporting that it was a binary file. I can continue to search it with grep -a, but I was wondering what change ...
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How to find files containing two strings in different lines

A real example is: I have a Python file util.py, and I changed one of the function name from foo to bar. There might be other files using foo as function name and they are irrelevant. I want to ...
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What's the difference between \b and \< in the grep command

In the man page of grep, I see The symbols \< and \> respectively match the empty string at the beginning and end of a word. The symbol \b matches the empty string at the edge of a ...
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Why pidof and pgrep are behaving differently?

I have a init script in /etc/init.d/myservice for initialize a service like this: ... start() { ... daemon /usr/sbin/myservice ... } stop() { ... pgrep myservice pidof myservice ps -ef ...
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Find pattern from one file listed in another

I want to find patterns that are listed in one file and find them in other file. The second file has those patterns separated by commas. for e.g. first file F1 has genes ENSG00000187546 ...
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Mac OS X find/grep generating “unknown --devices option”

I am entering a command I have done often with Linux, Unix perfectly fine but with Apple Mac OS X 10.8 (and probably before) I get a grep: unknown --devices option when I attempt to run the following ...
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Search for values in 2 columns from CSV

I have a csv files with say 20 odd columns. I need to get the 14th and 15th column values where value in 14th column is say "VALUE1" and value in 15th column is "VALUE2". My condition gets satisfied ...
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How can I get the seprate results for each pattern from multiple grep

I would like to search 14 different patterns within 100 files. At the moment what I tried cat s_3_2_*_qseq.txt | grep -c 'pattern1\|pattern2\|pattern3\|pattern4\|pattern5\|...pattern14' This ...
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Search for specified keywords in files and copy to a new filename based on the keyword

I'm trying to create an .sh script where if any keyword is found in a file then copy that file to the directory /pathtofolder/keywords/$thefirstkeywordfound (overwrite the file if it already exists). ...
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counting multiple patterns in a single pass with grep?

I've written a grep loop to iteratively count DNA trinucleotides within a gzipped DNA fasta file containing DNA sequences e.g. declare -a tri=(AAA AAC AAG AAT CAA .. etc) for i in ${tri[@]} do ...
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Filtering the result of the find command, so that it returns only directories

Is it possible to get only the results from find that are directory paths? Using find with some option, or using grep or some other utility the results are piped into as a filter? I thought something ...
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Print a text file from a line number to another after searching for the lines

I want to print a text file from X line number to Y line number The value of X & Y is determined by searching for a specific line in the text file(in this case the page number) I search for the ...
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How to use grep/ack with files in arbitrary encoding?

On my Linux desktop I have a UTF-8 locale. When I try to search some KOI8-R encoded files with grep (ack), it fails. If I manually encode the pattern into KOI8-R and pass that as an argument, it ...