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

learn more… | top users | synonyms

7
votes
3answers
800 views

What are the exact differences between awk and cut with grep? [closed]

We know that we can get the second column of the line we want from a file using these two techniques: awk '/WORD/ { print $2 }' filename or grep WORD filename| cut -f 2 -d ' ' My questions are: ...
6
votes
10answers
704 views

Copy only Specific text of a file to another

I have a file abc.txt the contents are <classpathentry kind="src" path="Sources"/> <classpathentry kind="con" path="WOFramework/ERExtensions"/> <classpathentry kind="con" ...
1
vote
3answers
127 views

Returning only the portion of a line after a matching pattern (Unix)

I have a parent folder (abeps) which contains several sub folders (1,2,3....25) where output file is located, one in which - all are the same name (opt.out). In this files there is an unpredictable ...
4
votes
3answers
158 views

conditional coloring in grep

I have a simple bash script. One line of my script matches a "pattern" with grep and colors the match grep -i --color=always -- "$1" I need to modify it, so that it only colors the match, if the ...
0
votes
4answers
190 views

Search for a Value only in one column w.o using awk, sed, or perl

I have a file that looks like this : Marketing Ranjit Singh FULLEagles Dean Johnson Marketing Ken Whillans FULLEagles Karen Thompson Sales Peter RobertsonPARTGolden ...
1
vote
2answers
166 views

How to show specific lines from specific columns of a file

First off, I'm not allowed awk, sed or perl. For my assignment I was given a file of employee list: Marketing Ranjit Singh FULLEagles Dean Johnson Marketing Ken Whillans FULLEagles ...
4
votes
1answer
99 views

Blank lines when executing “grep | xargs” in a “find -exec”

I'm trying to list all directories of a web server that are blocked by Apache via a .htaccess (containing deny from all). I've managed to get the list of blocking .htaccess but when I try to extract ...
5
votes
3answers
579 views

Recursive grep vs find / -type f -exec grep {} \; Which is more efficient/faster?

Which is more efficient for finding which files in an entire filesystem contain a string: recursive grep or find with grep in an exec statement? I assume find would be more efficient because you can ...
0
votes
1answer
85 views

Duplicate specific text in text file, using perl or grep

I need to duplicate part of a plain text file as follows: The text file consists of a sequence of "pages", of the form: <page [lots of lines of text] /page> <page [lots of ...
3
votes
2answers
80 views

how to grep complex hierarcy?

I have a file as:- start apple 1 a 2 b 3 c start orange 4 a 5 b start mango 1 a start a/b/c 5 z end 4 b end 6 c end start banana 3 c end 4 d 5 e end I want the output as :- 1 apple/a 2 apple/b 3 ...
2
votes
1answer
45 views

Globbing fails in zsh, but works in bash

I have an alias in bash, that I'm trying to port over to zsh. I thought it may have been the alias itself, but now it seems it's just the globbing. grep -irl --exclude=\*.{log,class,fuegoclass,dat}* ...
3
votes
5answers
114 views

How to “grep” a string of a returned result

How to grep the number 50.0 from the string temp=50.0'C In JavaScript I can use the expression /temp=(.*?)'C/ to get it. But I cant get it running in grep.
2
votes
1answer
89 views

How to find text in files and only keep the respective matching lines using the terminal on OS X?

I am pretty new to the terminal and command lines, from what I have found out grep seems to be the right tool for search files for specific text strings. I have a folder with many huge text files and ...
1
vote
7answers
846 views

Can grep be used for searching files with some string in their names?

I understand that grep can only be used for searching for files which contain a string in their content. Can it be used for searching for files with a string in their names? I read the manpage, and ...
2
votes
2answers
233 views

Grep log and get text between log delimiters

Is there a way to grep a log and find text between the log entry delimeters? Our log file separates the line entry with characters "-------" So when I search the text word I want all the lines before ...
6
votes
4answers
828 views

Why doesn't grep using pipe work here?

I have the following command: find / -name libGL.so.1 Which returns lots of lines with "Permission denied". I want to exclude such lines, so I added the following: find / -name libGL.so.1 | grep ...
0
votes
1answer
82 views

Grep : Find all possible cases of a word in text file

I have a directory with many text files. Out of these files, I am interested in a word "abcdefghi". I need to list all possible cases of this word such as abcdefghi abcdefghI abcDefghi ABCDEFGHI ...
2
votes
3answers
68 views

Make grep work for special filenames

I have a set of txt files whose names may contain space or special characters like #. I have a grep solution grep -L "cannot have" $(grep -l "must have" *.txt) to list all the files who have must ...
1
vote
3answers
483 views

Find files containing one string but not the other

I am in a folder with lots of .txt file, I would like to find all the files which contain stringA, but don't contain stringB (they are not necessarily in the same line). Does anyone know how to do ...
1
vote
0answers
32 views

Filter partial output of some script [duplicate]

I need to analyze the output of some script So, I know their header and their tail of some part of the output script, but not the content. I found an approach [1] But I need something like: $ ...
4
votes
1answer
71 views

Redirect grep out to a file does not work [closed]

I am doing a recursive grep by the following command: grep -r "load" . > tmp.txt However, when I hit enter, the command does not execute and bash is waiting for more inputs.. My OS is Ubuntu ...
1
vote
1answer
61 views

grep file from file

What is the fastest way to grep -v a file against another one, both line by line. does grep support this ? Or should I use it on two for loops ?
3
votes
1answer
103 views

pcregrep newline lookbehind assertion bug?

Attempting to use pcregrep to print the first line after a blank line. For example, contents of file first line second line I need second line to be printed. Here are a few tests using the same ...
-1
votes
3answers
102 views

How can I run a grep on epub/mobi files?

Is there a way to do it, particularly on a set of multiple epub/mobi files in one directory?
-1
votes
4answers
105 views

How to exclude directories from `ls -R` output?

If ls -aR | grep ":$" returns ./.hiddendir2: ./dir1: ./dir3: ./dir3/.hiddendir4: then how can you update the pattern given to grep so that you only get ./dir1: ./dir3: (note that the last ...
2
votes
2answers
169 views

grep print relative file path when doing a recursive search

I'm trying to find out which version of hibernate the project depends on (this is orthogonal to my question). We have a parent project with several sub projects, and I know this is defined in one or ...
2
votes
4answers
139 views

Color matching but print other lines too [duplicate]

I have an alias: alias grep='grep --color=auto'. I wish to have some way to print not only matching row but all of them and just color matching patterns. I doubt is there an option to do that in the ...
0
votes
1answer
83 views

How many times does the same character occur twice in a row

My task is using grep to find how many times the same character occurs twice in a row. I was thinking about something like this but it isn`t working grep '[a-zA-z]{2}' *.txt | wc How can achieve ...
1
vote
2answers
72 views

Parse,Manipulate Data In linux/Unix

I want to have exactly the same output in this post(http://unix.stackexchange.com/questions/126139/extract-data-in-linux-unix)as above,but I have a new input file,which is below: ABCB11 4 ACE 11 ...
0
votes
2answers
549 views

How can I use grep to search multiple unnested directories?

It may sound like I'm asking the same thing as this question, but I have different requirements. This is an example of my filesystem: /code/ internal/ dev/ main/ public/ dev/ main/ release/ ...
5
votes
2answers
108 views

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
1
vote
2answers
167 views

Extract data in linux/unix

I have input data which I want to parse and extract values using awk/grep/sed: group-2 9 10 text color=black,from=ABCB11,fromid=4,order=2,thickness=3,to=ACE,toid=11,use=1,z=1 group-3 0 1 text ...
2
votes
1answer
275 views

Regex doesn't work with grep

I have a string like this TEST="/dev/sda1 on /media/sda1 type vfat (rw,relatime,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=iso8859-1,quiet)" (Result from mount | grep sda1) ...
0
votes
2answers
173 views

Compare first column in different files

I want to compare one file with other files in the same directory. file1.txt contains: move 34#123# get 11#278 put 33#29#567#23 file1.txt should compare with files 1.txt and 2.txt. 1.txt ...
4
votes
3answers
86 views

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 ...
1
vote
3answers
647 views

How to specify matching patterns while excluding some files having a PATTERN in their filenames

NOTE: I have updated this question from what I posted earlier and hence some answers may not match with what I intend to ask. I want to search some TEXT in a set of files in sub-directories and ...
7
votes
1answer
159 views

Grep search returning a different line

This is my grep search grep 'Invoker_Slark*' true_pairscore.txt But it returns the line Invoker_Slardar. Even though the file contains Invoker_Slark. Why is that?
4
votes
4answers
593 views

How to exclude some files not matching certain extensions with grep?

I want to output all lines containing the word OK recursively from a directory. But there are a few extensions which I need to exclude from the result: *~ *.map *.js except *.debug.js I tried: ...
1
vote
3answers
214 views

how to pipe the output of cut to the foreach command?

I have the cut command I want that grabs the first word in each line of a file. I then want to put each word from the cut command into a foreach. I then want to do a grep command inside the body of ...
3
votes
3answers
188 views

Rearrange text file by prepending data rows with header row

I have a file whose content looks like this: 2009 150 0 0 0 0000 75.316 0.0400390625 0.00007 0.00000 0.8980 76.216 0.0400390625 0.00007 1.00000 0.9046 77.217 0.0400390625 ...
2
votes
4answers
299 views

Can I use grep matches to execute command? CentOS

I need to upgrade php from 5.3 to 5.4. I've installed it with rpm. I want clean install: delete all 5.3 packages, and install all necessary 5.4. Here is the command to see all installed packages: rpm ...
4
votes
4answers
746 views

Detecting pattern at the end of a line with grep

If I do: $ ls -R .: 4Shared/ Cloud/ ./4Shared: UFAIZLV2R7.part3.rar ./Cloud: UFAIZLV2R7.part2.rar.part UFAIZLV2R7.part1.rar.part UFAIZLV2R7.part4.rar.part If I want to list the .rar files only, ...
2
votes
4answers
104 views

Find + Grep Recursive Search

I am mirroring a website using wget. On the server, there is a dump of the find / command, which includes filenames in the form : /dir1/ /dir1/page1.txt /dir1/page2.txt ... The mirrorring is very ...
0
votes
6answers
90 views

grep, display only files starting with . (hidden)

I tried to display only hidden files but dont know how to do it. That is working(but matching also dots in other places) ls -la | grep '\.' Was trying adding ^ but didnt find soultion.
0
votes
2answers
89 views

Extracting with grep/sed a first pattern and then a second pattern that occured some lines before and related to the first

I'm trying to extract a specific line from a .htm file when a pattern occur ("Event 100" in my example below) but at the same time I need to retrieve also another pattern which is related to the first ...
2
votes
3answers
203 views

How can I get the last line number of unique commands when grepping my history file?

I rely on my history file for previous commands, especially ones that are long with many parameters. Once I find the command and its line number(nn) I use !nn to run it. I prefer to see the full ...
1
vote
2answers
106 views

grep --byte-offset doesn't give me the bytes offset?

I run grep -b --byte-offset 'EXTH' Agent_of_Change.mobi but I only get "Binary file Agent_of_Change.mobi matches". How can I get the bytes offset instead?
1
vote
1answer
222 views

grep: match pattern on a particular position

I need to match a pattern with grep, only if it starts at position 16. Lets suppose I want to match the string ' pattern' (starting with space) the following should match bla bla bla bla pattern ...
2
votes
1answer
138 views

How to print strings matching a pattern with grep?

I want to get a list of strings matching the following pattern: CLASS_NAME:"*" where * represents any number of characters. I tried: grep -o CLASS_NAME:\".*\" script.js and grep -o ...
3
votes
4answers
291 views

extract the characters before () using grep

I need to extract the characters before the character '('. My file structure is: rose(good)ook daisy()no lilly(bad)fine sunflower()nice I need output file as in the form of: rose ...