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

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Search and replacing strings in a numerical data file

I have a data file I need to edit it is in the form: ...
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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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How to properly structure a zgrep command to return the proper count of expression matches?

I am trying to search through several bzipped CSV files and return a count of emails that contain a .br domain extension. It seems straight forward enough but I have not been able to structure a ...
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3answers
39 views

Find the row and append to the bottom of the file

I have a big file with some record which will be having different values than others. Actual data file: 000000106500000000000129201300000U1E4600000060000+00000020400+00000002532+000000 ...
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What's the point in redirecting output of grep to /dev/null?

Consider this line: ${libdir}/bin/licenseTool check "${SERIAL}" "${VERSION}" "${PRODUCT}" ${libdir} | grep '^200' >/dev/null What's the point of looking for the pattern in the output if the ...
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match a string with special char and exact match using grep

I have a large file and want to search only specific string. eg. mobNo='xxx-xxx-xxxx' i have a lot of string in this formate. i am tring grep "mobNo=\'*\'" . can some one help me. Thanks in ...
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4answers
455 views

Grep first 50 lines of files for pattern

How might one search the first 50 lines of files in a directory for a given string? I'm specifically looking for which database table files (from mysqldump) define a specific field, but I don't want ...
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3answers
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How to start multi-threaded grep in terminal?

I've a folder which has 250+ files of 2 GB each. I need to search for a string/pattern in those files and output the result in output file. I know, I can run following command, but it is too slow!! ...
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Find repository names from gitolite info output

How do I extract the names from the gitolite info command output, for further piping into a script? I'm writing a migration script to migrate all my repositories from gitolite to a Gitlab server. ...
0
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33 views

Filter grep output

Using grep "val" index.php I get the list <td class=val> 7.6</td> <td class=val> 58</td> <td class=val>1013.8 </td> <td class=val> 1020 </td> <td ...
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Filtering multi-lines from a log

Should this question be moved to stackoverflow instead? I often need to read log files generated by java applications using log4j. Usually, a logged message (let's call it a log entry) spans over ...
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1answer
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grep with regular expression

I want to match all the lines that are of the below pattern in a file using grep. Abc::xyz() [18-Feb-15 12:09:16] I came up with below regex with grep , but it is not returning match. Please help ...
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Why can't I pipe to ack?

So I've been trying to use grep to extract some stuff from a Mercurial log and trying to avoid using awk just to see if I can get by without it here, and failing because neither grep nor egrep support ...
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1answer
33 views

Anchors not working with grep

I am trying to do an extended grep on Android logs. However, I am not able to match the anchors for it. Here's my query - grep -A 25 -E 'show\(authenticated = ...
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1answer
74 views

Using the grep filter

I have a text file with the name "hello.txt" that contains the following two lines: Hello WORLD! Hallo world! When I wrote the following grep -i h[ae]llo hello.txt in the terminal, the output ...
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1answer
42 views

Using fixed strings in regular expressions?

I am writing a bash script which accepts a list of CSV files as arguments and outputs e-mail addresses only found in the first file. To accomplish this, for each record in the first CSV file I look ...
0
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1answer
37 views

grep two searched words

I could search lines that contain two specific words using the following in multiple files: for f in $(ls *.txt); do echo ">"$f; more $f | grep word1 | grep word2 done Now, I want to write a ...
4
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1answer
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Find the files between two folder dates in linux?

I need to find the folder names along with the file names which has my string in their contents. I am in this directory "/data/queue/data" and I have lot of folders in the same directory and inside ...
1
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1answer
35 views

List all regular files containing (in their name, directory or their content) a specific (sub)string

Like in the title, and also I want to print the number of the line in each (text) file where the substring occurs. So far I have: find /sys | grep "filesystem" But it appears to only look at the ...
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2answers
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Why am I getting “invalid max count” from grep in an alias?

So the idea is to create an alias that will search my alias's for me. I have quite a few. dude@gnarleybox:~$ grep alg .bash_aliases.sh alias alg='alias | grep ' dude@gnarleybox:~$ alias | grep alg ...
2
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2answers
101 views

how to grep for specific time period in a log

We work with log files that have line entries that start with a date/time format such as this: 20150408 13:29:28 <rest of text> What would I need to do in order to grep for a date range? Say ...
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1answer
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Using egrep in Bash

I'm taking a UNIX course atm, and I've got a newb question. In the following code, I'm getting an error and I'm not sure why: [name@unix ~]$cat test123 123 456 789 1011 1213 [name@unix ~]$egrep ...
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Why does not changing changing LC_ALL from utf to C speed up my grep?

I wanted to try to speed up my already fast grep. I read that changing lc_all from utf to c was supposed to do this. However, it gives no speedup. What might the reasons be? How do I "debug" this? ...
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1answer
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What is the email matching regex in basic regex for grep?

I created a text file and put some email addresses in it. Then I used grep to find them. Indeed it worked: # pattern="^[a-zA-Z0-9]+@[a-zA-Z0-9]+\.[a-z]{2,}" # grep -E $pattern regexfile but only as ...
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Find all the PHP scripts with email in my postfix mail queue

How do I find all the scripts that have mail sitting in my postfix mail queue? This server is sending out spam and I've spot checked it, but I want to make sure I haven't missed any scripts that may ...
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How to run multiple AND in grep command [duplicate]

I'm trying to run multiple AND combination in grep command, I was able to run using two patterns: grep -E 'pattern1.*pattern2' filename Is it possible to use three or four patterns using the above ...
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1answer
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grep: Syntax error near unexpected token `('

I have this problem: I'm looking for a string inside file . Syntax is: grep -E ‘( ^ | [[:space:]] )[A-Z]{2}[[:digit:]]{2}((- | [[:space:]] )[[:alnum:]]{4}) {3} ’ (filename) When I run this ...
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Finding files that contain multiple strings

I am trying to find scripts that contain common malicious code, I need to match multiple strings within each file. What I am using is working but am not sure why I get the following in the output: # ...
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203 views

Print unmatched patterns, using grep with patterns from file

patterns.txt: "BananaOpinion" "ExitWarning" "SomeMessage" "Help" "Introduction" "MessageToUser" Strings.xml <string name="Introduction">One day there was an apple that went to the ...
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3answers
673 views

Strange behaviour of “ls -a | grep ^\.”

I wanted to list the content of a pwd and display only file starting with dot. I tried ls -a | grep ^\. but I cannot figure out why the output contains also the files which do not start with dot. For ...
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awk & grep to search for all strings in file1 on file2 where strings can have pipe [duplicate]

Please ignore - this post is a duplicate of this one. I have file-1 which has list of transaction id . File -1 ...
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1answer
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string search using awk

I have file-1 which has list of transaction id . File -1 201503301616|9b8791b3-f860-409f-aad0-24debf834c1b|10.233.18.29.677220869928387637969 ...
3
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1answer
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Grep a specific word in a single string with repetitions

How can I grep a specific word in a single string that contains repetitions? For example : Apple_1 Apple_1_Test Juice_2 Juice_2_H If I use grep -Eo 'Apple_1' I get two results (because of two ...
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How to perform grep onto the output of ldd properly ?

# ldd /usr/bin/ffmpeg linux-vdso.so.1 => (0x00007ffffc1fe000) libavfilter.so.0 => not found libpostproc.so.51 => not found libswscale.so.0 => not found ...
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2answers
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grep or find a pattern in all directories [duplicate]

I have an account number 1234-5678, I am trying to find it in all files of directories. I used the below command but no result found. grep "1234-5678" */ Please can someone help me how to find it in ...
3
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1answer
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Extract first word after pattern that includes `[…]`

I have an issue when I try to extract the first word after grep matches my pattern . Let me show you an example : cat test.txt [profile dev] xxx xxx [profile prod] xxx xxx now I want to extract ...
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4answers
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Is there a way to grep a folder and show all lines containing non-ascii characters?

Some code I am working with has a bunch of comments written in Japanese and I am working on translating them to English. Is there some way to "grep" for all lines containing Japanese characters or at ...
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How to grep the n-th substring between given delimiters?

Let's say we have a string and its delimiter is ?: Leslie Cheung April 1 ? Elvis August 16 ? Leonard Nimoy February 27 I know how to grep the first substring between delimiters: echo $above_string ...
2
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1answer
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grep behaving abnormally

grep is behaving different when letter a is being searched. when letter a is included in search criteria, it is not searching for any other letter. But it is not the same case with other characters. ...
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2answers
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grep with count of individual patterns

I have a file with MAC addresses (1/line with : as separator, sorted) and I need to find out how many times each of these MAC addresses appears in the file. I modified this: How to count occurrences ...
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3answers
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grep log lines of a specific id request

So, I have the following log sample: 2015-03-30 10:19:44,200 DEBUG [Default : 1] [Application:ABC BIW: IDA:6d87de8e-1276-4496-b49d-dd4cd375cbe4 Info:P23 Code:ABCD] A log message 1 2015-03-30 ...
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2answers
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How to print an element from the corresponding immediate next column after searching the element in the current column?

I have thousands of lines as seen in the following list. file name = "textfile" 3 2 3 1 4 7 5 8 6 8 9 8 8 9 4 7 3 9 2 3 4 4 9 2 2 2 0 9 4 0 0 9 8 2 4 0 I have to search a particular element – ...
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2answers
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Parsing C Style Multiline Comment

I want to filter non-commented javascript with sed and output the line number Here is the example: /*! * jQuery UI 1.8.17 * * Copyright 2011, AUTHORS.txt (http://jqueryui.com/about) * Dual ...
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3answers
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How can I extract the text between two strings in a log file?

I think I have a very similar question to this one but I see it was closed due to being unclear so I'll create a new question. I've got a log file that contains one-line entries with multiple ...
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1answer
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Is it possible to get static backreference with grep?

I try to match a a group twice in multiline. grep -Pz 'Source: (?<group>.*/).*\n.*\n.*\n.*\k<group>|$' it work except one major problem - it doesn't, \k<group> search for .*/ and ...
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find and grep pipeline returning nothing

I have files named lect1.txt, lect2.doc, and lect3.doc. I want to get a file which is a .txt file, and contains lect as the filename. I tried find *.txt | grep lect* and it returned nothing. ...
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Why is “grep keyword” causing the terminal to stand by forever?

When I type "grep doc" in the terminal, it just don't do anything, stopping the terminal from doing anything else before I escape using Ctrl+C or Z. I know this isn't how I'm supposed to use grep, ...
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1answer
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can we get sorted grep output

I have same: 1.txt with apple written in it, 2.txt with mango written in it, 3.txt with apple written in it, 4.txt with mango written in it. grep -e apple -e mango *.txt will give result as: 1.txt: ...
0
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47 views

Search a file for a string in multiple directories

Can someone please help me with a command to search a file for a string in multiple directories? I am searching for the VIP in httpd.conf in multiple httpd instances. I am using: find ./ -name ...
0
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1answer
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Using regular expressions to search a word list. Finding 2 letter words instead of 3. Why?

I am studying regular expressions and I am stumped. Here is my process so far.... I downloaded this file. wget http://www.mieliestronk.com/corncob_lowercase.txt mv corncob_lowercase.txt words.txt ...