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

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What special characters does grep parse by default? [duplicate]

Possible Duplicate: In a regular expression, which characters need escaping? I know there is the -E flag which treats the "search term" as a regular expression. However, it seems that even ...
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How can I redirect matching lines to a file, and non-matching lines to a different file?

Is there a script/program/utility already available for the following requirement in a optimised way? someCommand | tee >(grep "pattern" > LinesWhichMatch) | grep -v "pattern" > ...
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How to search for a word in entire content of a directory in linux

need to search for something in entire content I am trying: find . | xargs grep word I get error: xargs: unterminated quote How to achieve this?
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How to show lines after each grep match until other specific match?

I know that by using the "-A NUM" switch I can print specific number of trailing lines after each match. I am just wondering if it's possible to print trailing lines until a specific word is found ...
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Diff similar lines

I'd like to print a list of lines where the first word in two files is identical, and the rest of the words are not. Some complicated mess with comm, grep and cut would be possible, but hopefully ...
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Using grep to read a paragraph on Solaris

How can I grep a paragraph from a file in the Solaris operating system? I tried the -p option used in AIX, but it's not useful in Solaris. grep -p Accept is not working in Solaris. Is there any other ...
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How do I grep without leading whitespaces?

I'm greping through a large codebase, and leading whitespaces and tabulation seem to be quite annoying. Is there any way to get rid of it? grep -R "something" ./ E.g, instead of: foo/bar.cpp: ...
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How do I pass a list of files to grep

I am using find and getting a list of files I want to grep through. How do I pipe that list to grep?
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How do I execute a command on a given string in each line of a file?

Let's assume that I already have a file created. This file creation comes from the execution of a command. The contents of the file will be up to 4 different lines looking something like this: LUN ...
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What makes grep consider a file to be binary?

I have some database dumps from a Windows system on my box. They are text files. I'm using cygwin to grep through them. These appear to be plain text files; I open them with text editors such as ...
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Use “grep” to match text in multiple files

I have data in multiple files. I want to find some text that matches in all files. Can I use the grep command for that? If yes then how?
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executing multiple greps in a single find command

I want to use find command to find some files containing multiple patterns at the same time. I tried something like this: find . -name "*.xml" -exec grep -iH keyword1 + && grep -iH ...
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How to display line number while doing grep on a file

How to display line number while doing grep on a file. For example: grep CONFIG_PM_ADVANCED_DEBUG /boot/config-`uname -r
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Using grep -v on multiple arguments

Is there a simpler way to do this? grep -v foo file | grep -v bar There're probably very elegant ways to do it with egrep, but how to go with plain old grep? EDIT: grep -v 'foo\|bar' file seems to ...
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How to specify characters using hexadecimal codes in `grep`?

I am using following command to grep character set range for hexadecimal code 0900 (instead of अ) to 097F (instead of व). How I can use hexadecimal code in place of अ and व? bzcat archive.bz2 | grep ...
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grep surrounding characters of a match

I'm looking to do a find and replace within a giant database dump, and it's not doing what I think should happen. I'd like to grep for my target string in the file, and then see the surrounding 8 ...
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Why is grep -o -w not giving me the expected output on Mac OS X?

If I do echo foo bar baz | grep -o -w baz the output is foo bar baz (and an extra newline). The expected output would be baz as the -o option should only display the matched part. I'm using Mac OS X ...
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How to search for a string only in textfiles? (recursively)

I can list all the textfiles (by mimetype) in a folder with: find . -type f -print0 | xargs -0 file -i | fgrep -i text | sed 's/:$//g' 2>/dev/null | awk 'BEGIN {FS=": "} {print $1}' Ok. But how ...
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Searching for a string on multiple zip files.

I have a folder that contains about 200 zip files. Each zip file contains only one text file in it. I would like to search for a specific string in all the text files in all the zip files. I tried ...
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How to feed the results of date command into grep to filter results of another command

I need to use the result of a formatted date command (date +"%m/%d") as the grep filter to filter the results of another command that will display alerts on a system so that I only see alerts from the ...
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Regex : match 2nd and 3rd character

I was doing some exercises on regular expressions, but I can't seem to be able to crack this one : egrep in a file where the 2nd and 3rd character are the same. I tried : egrep '^..{2}' ...
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Add carriage return to output of `tail` while using `grep`

I'm looking to refactor the following command: tail -f production.log | grep -e "Processing " -e "compatible;" -e "Completed in " -e This is the output of the command: Processing ...
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What is the difference between `grep`, `egrep`, and `fgrep`?

Can any one tell me the technical difference between grep and egrep, and fgrep and provide a suitable example? When do I need to use grep over egrep and vice versa?
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tee and grep at the same time (shell)?

I'm trying to run a server that writes to $log (a txt file) and then find all the text in the logfile that starts with '[1]' and put it in another file. Here's my attempt. tee -a $log works along with ...
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Deleting Lines Containing a Specified String in Different Files

Suppose there are two files in web/ named foo.php and bar.php. The 1st line of foo.php is "sdajgeSTRINGdsad" and the 10th line of bar.php is "gdfhu98324STRING". The task is to first locate these two ...
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Is there a way to get the effect of combining grep -v with grep -A?

Is there a way, either with grep or something else, to (in effect) combine grep -v and grep -A? That is, rather than include everything for x lines after a string, exclude everything. Quick reminder ...
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Pattern Matching Exclude Duplicate Characters

Is there a regular expression for the following that matches characters in a character set but only once? In other words, once a character is found, remove it from the set. If grep cannot do this, ...
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In-place substitution for lines matching some pattern in a given set of files

Following on from my previous question: Remove slashes/parent paths from filenames inside CSS and Javascript content I arrived at the following command which replaces any filenames in these ...
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find first line beginning with <keyword> following <other-keyword>

let's present my problem to explain better. I'm using cygwin, the installation is based on a setup.ini with the following format: @ package-name sdesc: "short description, on one line" ...
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How to search text throughout entire file system?

Assuming that the grep tool should be used, I'd like to search for the text string "800x600" throughout the entire file system. I tried: grep -r 800x600 / but it doesn't work. What I believe my ...
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grepping a variable and adding 1 to it

I have a variable containing a leading zeroes number, and I want to grep this variable and that same variable plus one. I made several attempts but ran into errors. Here's what I want to do: read var ...
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How can I assign the output of a command to a shell variable?

I want to assign the result of an expression to a variable and concatenate it with a string, then echo it. Here's what I've got: #!/bin/bash cd ~/Desktop; thefile= ls -t -U | grep -m 1 "Screen Shot"; ...
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Sum of grep results

I need to output the sum of a grep results for a certain time, for now i hard coded the time grep but any help will be very much appreciated, my problem is i cant output the results on the script. If ...
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1answer
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Time/Date grep for 15 mins

I need to grep a specific type of line in a specific time of the log, do you have any ideas? Here's my working script: cat *.log |grep -E '2011-06-30 (1[0-1]:[0-1][0-5]|10:16)'| grep -ach '0110 ...
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how to execute lines coming from a grep result?

I've got a text file with certain installation instructions, and I know I can grep for a unique occurrence in the file. For example, the text file has something like: MYDIR=`find /home/user -name ...
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Curl and grep html text

Is there a way to grep html text from a curl request and output grab the value that is between two html tags? More specifically the input value of a form?
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vim/emacs plugin to view recursive grep search search results?

Suppose I have a file formatted like this: file1:123 file2:4444 some/other/file:2233 This represents the search results from a grep (i.e. file:line-number). I'd like to have a vim plugin which ...
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Searching for string in files

Is there an easy way to search inside 1000s of files in a complex directory structure to find files which contain a specific string within the file?
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Find a string only in a specific file inside subdirectories

Let's say I need to find the function GetTypes() in all C# source file (.cs) the directories/subdirectories. I used grep -rn GetTypes *.cs, but I got an error with grep: *.cs: No such file or ...
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sed, grep, or tr command that returns only Latin characters from a UTF-8 file

I am working with the text of the 300 tang poems, which unfortunately is a single file containing both Chinese and English. Since I am interested in 'extracting' the English, I hope to use sed, ...
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pad a number with zeroes

I need have put 0 on the results of my grep so my script format will be fine and i don't have any idea how to do it. here's my grep result : 261 : 261 = 0 | 1192 : 1184 = 8 | 283 : 283 = 0 | 666 : ...
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How do I recursively grep through compressed archives?

I'm trying to find out what modules use Test::Version in cpan. So I've used minicpan to mirror it. My problem is that I need to iterate through the archives that are downloaded, and grep the files ...
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How costly is case insensitive search as compared to case sensitive search?

I dont think grep -i is exponentially (wrt to the number of characters to be grepped) more costly (time wise) than a normal grep because the run times are not too different. But theoretically it ...
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Can grep output only specified groupings that match?

Say I have a file: # file: 'test.txt' foobar bash 1 bash foobar happy foobar I only want to know what words appear after "foobar", so I can use this regex: "foobar \(\w\+\)" The parenthesis ...
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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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Reverse grep to get the last couple of occurrences in a file

Say I want to grab the last 5 mentions of cron in /var/log/syslog.log looking over the grep manual it seems like I can't get grep to search in reverse. I can however grab the most recent occurrences. ...
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Is there a archive of old man pages? specifically for the features available for grep in early 'ed'

This is just a bit of history rummaging... I'd like to know how different today's grep is to the original implementation, introduced by Ken Thompson in ed. which evolved to ex, which then became vi... ...
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Grep - ^(\s*$) vs ^\s*$

I want to search for a field that only has spaces. When counting, this two commands gave me different results: grep "^\s*$" -E -c grep "^(\s*$)" -E -c Another thing. What is the correct way to say ...
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How to search for file contents [duplicate]

Possible Duplicate: Finding a substring in files across subdirectories with a single built-in command? I know that I can use grep for a single file, but what about a whole directory tree?
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Grep: Show all the file up to the match

grep --before-context 5 shows 5 lines before the match. I want to show everything before the match. Doing grep --before-context 99999999 would work but it is not very... professional. How to show ...