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

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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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157 views

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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2answers
95 views

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
179 views

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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2answers
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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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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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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
105 views

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 ...
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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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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 ...
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1answer
156 views

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
192 views

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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5answers
559 views

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
282 views

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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3answers
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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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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: ...
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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 ...
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6answers
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How can I use grep to search only on the first line of files for a specific string?

How can I use grep to find a string in files, but only search in the first line of these files?
0
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1answer
61 views

Cron start script twice

I have a backup script which sends my snapshots to a off-site location. 0 0 * * * /root/backup/backup_incremental >> /root/backup/test.log For some reason my PID file which should stop the ...
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1answer
35 views

Grep rows where change occurs in columns

I'm wondering if there is a grep command to return the row lines where a character in a column changes... for example if I have a file: 1 1010 1 101010 1 10101010 2 1010 2 101010 2 10101010 And I ...
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4answers
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How do I perform xargs grep on grep output that has spaces?

I'm searching for files based on a regular expression, and then I'm trying to search those files for content. So, for example, I have something like #Find all C++ files that match a certain pattern ...
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grep with variable

I am trying to create a script to monitor all logins using sudo, both success and failure. Right now, I have: set tdate = $(date "+%b %d") set attempted_su_log = /var/log/suattempts cat ...
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4answers
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Insert new lines with missing values (NA)

I would like to insert new lines in text files if there are missing values. I have for example the following text file (A.txt), for which line 5 is missing. In addition, as the file should have 12 ...
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4answers
199 views

How to search the word after the specific line in the file in linux?

I have a file with 100 lines and i have to search the word happy but the search must start after the 50th line of the file. what's the exact grep command is used in linux?
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Find out on which line in text file is matching word

Is there any way to find out on which line of the text document is some word which is matching pattern for example with grep or something. Thanks.
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4answers
636 views

Can I use Find and Grep in one line

I am a complete novice in UNIX and desperately need some help. I have a directory structure based on events. In these events I have one type of file which does or does not contain a pattern for ...
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2answers
168 views

Search only in plain text files that are not source code

I use following command to search for string ELF in plain text files under the current directory recursively: grep ELF -r . but it also searches in binary files (e.g. zip file, PDF file), and in ...
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6answers
162 views

filter out length

I have a file which contains 3940 sequences and looks like >TCONS_00000066 gene=XLOC_000030 CCGCCGGCTGCTGCGCGCACCGACTTGTCACCACCCCAGCACGTCCTCCACGTATACAAG ...
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2answers
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Why is grep searching more than the files I want with asterisk?

Deep within a bash script I have grep -Ech 'string1|string2' /server/directory/$servername_log_20150312* | awk ... I was getting the "too many arguments" error so I turned on set -x and I see that ...
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2answers
282 views

How to put $@ in quotes?

My bash script looks like this: #!/bin/bash grep -r --color=always $@ . | nolong The file is saved in /usr/bin/findstr Everything's ok when I run this: findstr hello But when I run this: ...
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1answer
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Find a file that doesn't include specific characters

I want to find a specific file that doesn't start with a,k,G or Q and in which the third letter in the name is not a digit. I have tried many links, but found nothing regarding to this composite ...
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grep to get all the getters from a java file

I have a java file called Friends.java . There are 5 variables and each variable has its own getter. Assume that all the functions below follow standard java standard, i.e public methodName(){ //Some ...
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Grep not writing output until end of input [duplicate]

I have some script that is taking a long time, and producing a lot of output. I want to send the full output to one file, and pick out some specific lines to be directed to another file. Since it ...
2
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3answers
185 views

Keep a tally from a log file

I have a file called output.log which has this content: Thread started Thread finished Thread started Thread finished Thread started Thread started I monitor its output using: tail -f output.log ...
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3answers
443 views

Output to be saved in file named same as the input file [duplicate]

I have one input file and run some command but want the output to be saved with the same name as the input file has. I tried below command but it makes the output file blank: cat file1 | grep ...
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126 views

How would I grep for a password file entry without using 'username'

Can a who command be integrated to find the current logged in users password file entry?
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1answer
40 views

ack.pl tool and ack.pl flags

I am using the ack.pl tool in order to search string or IP’s in files The official site of ack.pl is - http://beyondgrep.com/documentation/ Example of ack.pl CLI ( want to find the string ...
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2answers
116 views

Regular expression to match sequences of alphanumerics

Any way using grep/awk/perl to match lines in the form *.* = *.* (i.e. ac4df.bx5dfd8g = ce5def.dd5f7gdgf ) Where * means 0+ alphanumeric char?
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SED: print entire paragraph for specific pattern while loop

I find partial answer about my problem on this question but i still have trouble. I need to use a variable as a pattern for the sed command in a loop sed -e '/./{H;$!d;}' -e 'x;/'$var'/!d;' The ...
0
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1answer
116 views

grep recursively in ksh on AIX [duplicate]

How do I grep recursively in directories and sub directories in ksh on AIX? I have tried grep -r but this is not available.