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

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Grep pattern in ksh [duplicate]

a small question regarding grep. I'm doing : find . -type d And I have three directories : ./backup-2013-11-27 ./backup-2013-11-26 ./backup-2013-11-28 If I only want to retrieve the one from ...
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2answers
37 views

Extracting just a single group from a regular expression

I am trying to get a list of numbers from some hacked-together log files using zgrep. So, I am using: zgrep -ie "total time: .* ms" * This returns the whole line that I care about. I'd just like ...
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224 views

“grep: Unmatched [” error when using regex

I'm trying to find a pattern similar to this: tail -n 100000 gateway.log | grep -B10 -A10 'Nov 22 11:13:56 Received Packet from [10.50.98.68' Where "11:13:56" could be any time. This is what I ...
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Why two almost idetical grep commands return different output: w/o and with filename

I have 2 almost identical greps: [Alex@localhost tmp]$ grep /bin/bash /etc/passwd root:x:0:0:root:/root:/bin/bash AlexL:x:500:500::/home/AlexL:/bin/bash user1:x:501:501:user1 ...
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2answers
106 views

Count occurrences of line in multiple files

I have log files that I need to grep and count the number of occurrences of a specific line. Issue is that I must start at a specific line of the first file and only count occurrences after that ...
2
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1answer
357 views

Search for a String inside all files inside a war

Where I work someone had Java project and used Eclipse to export that project into a .war package. Now I need to search for a string inside all the files that make that .war package. I know that a ...
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7answers
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How do I find text within a file and have it search multiple subfolders?

I'm looking for a function name and the folder structure is deep and there are a lot of files to look though. Usually I go with something like find * | grep functionname but is that the best way?
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2answers
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Replace “-from” with “this” in the begining of line

I want to replace "-from" with "this" in the begining of line. This should happen when that line has 'R' at the end and line above it has "D" at the end. For example for the block shown below: ...
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3answers
561 views

Count tabs per line in text file with utils

I have a tab-tabulated file. I would like to check if every line has the same number of tabs. For first step, I'd like to print the number of tabs for each individual line. I've tried grep -o '\t' ...
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8answers
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pgrep and pkill alternatives on mac os x?

Are there alternatives to pgrep and pkill commands on Mac OS X or should I just create aliases for them using other commands available for me?
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2answers
129 views

Count entries for each directory in tree

Say I have the following tree: root: d foo d bar /foo: d A - tmp.txt /bar: d B - tmp2.txt /foo/A: - tmp3.txt /bar/B: d = directory and - = file I need to answer the following question: which ...
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How to grep standard error stream (stderr)?

I am using ffmpeg to get the meta info of an audio clip. But I am unable to grep it. $ ffmpeg -i 01-Daemon.mp3 |grep -i Duration FFmpeg version SVN-r15261, Copyright (c) 2000-2008 Fabrice ...
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1answer
113 views

grep block of lines

I want to grep every block of lines that has starting line with "CK \" at the end of line and ending line that has "D \" at the end of line, I can use sed/awk/grep etc. So far i have tried following ...
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1answer
79 views

Find all lines between a line matching a pattern and a line matching another pattern

i want to start grepping from the lines that has "CK" at the end of line and stop grepping when the line has "D" at the end. I tried grep "$CK" "$D" file..txt , but it didnt work. Input: kkkkkkkkkkk ...
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4answers
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How can I grep for a string containing regex metacharacters like $ and '?

I want to search all files in the current directory and below for the substring $form['#node']. So, I have tried, initially: grep -R "\$form\[\\\\'" . and grep -R "\$form\[\'" . But it returns no ...
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6answers
223 views

Remove lines that do not start with a pattern from a given set of patterns

I have a file that contains data like this: report aaaaaaaa - .. -th bbbbbbbbb -to ccccccccc .. --. Question: I want to remove any line that does not start with following strings : report ...
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1answer
76 views

replace text after match

aaaaaaaaa bbbbbbbbb -th ccccccccc_RD \ DDDDDDDD FFFFFFFF -th GGGGGGG_RD \ using sed/grep/awk etc, In the above text, if a line ends with "RD \" , replace "-th" with "-to" at the ...
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3answers
327 views

Using sed/awk to remove anything after first space

aaaaaaaa 09 bbbbbbbb 90 ccccccccccccccc 89 ddddd 09 Using sed/awk/replace, in the above text I want to remove anything that comes after the first space in each line. For example the output ...
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1answer
150 views

grep on line before the match plus the match

zzzzzzzzz aaaaaaaaa bbbbbbbbb & ccccccccc & ddddddddd hhhhhhhhh eeeeeeeee fffffffff & ggggggggg & in the above line, what i want is to grep/sed/awk (any method is fine) line that ...
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2answers
698 views

What is the best way to find a list of several strings within a large text file

The short, general question is: In Unix/Linux, what is the best way to find a list of several (about 150) strings within a large text file? I am asking this to all Unix/Linux experts as a general ...
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1answer
225 views

Search low values in mainframe files

I am working with mainframe files and it seems that the low values (x'00') exists in the records in the file which throws off my import for fixed block. Does anyone know how to eliminate those ...
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Pipe to multiple files in the shell

I have an application which will produce a large amount of data which I do not wish to store onto the disk. The application mostly outputs data which I do not wish to use, but a set of useful ...
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1answer
96 views

Grep ^ and $ at the same time

I'm, trying to use grep with a ^ and $ at the same time but for some reason that does not work. If I type grep '^s.*e' german.dic I get a lots of words starting with s and having an e somewhere. A ...
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Meaning of the following linux commands

cat "$1" > /tmp/file.$$ 2>/tmp/file0.$$ grep "*" /tmp/file.$$ >/tmp/file0.$$ I understood that in the cat command, if an error occurs, the error will be shown in file0.$$ and if it ...
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solaris 10 + display 2 lines after match by grep?

I want to match for example: The string e1000g0 from the lltconfig -a list , and then to display the two lines after the string e1000g0 so I get only the lines: Node 0 du1a : ...
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How to get multiple lines out of a file by a regex?

I am trying to read part of an XML/SGML file (they are not necessarily well formed or in a predictable syntax, so a regex would be safer than a proper parser. In addition I would like to be able to do ...
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8answers
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How can I grep in PDF files?

Is there a way to search pdf files using the power of grep, without converting to text first in Ubuntu?
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1answer
425 views

Getting a date format with grep

I've looked at similar questions and tried most suggestions, but none of them got me anywhere, even though i have a fairly simple task I think :S. I'm fairly new to this whole thing, so I've run out ...
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2answers
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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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0answers
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How to use grep command to find the matching pattern and some more characters? [duplicate]

I have a compressed JS code and I want to find a pattern, but since the file is compresses, it has only a line, and the match pattern is all the file. The output is too much large. grep -r ...
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5answers
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Multi-line grep beween two tags, only show the last match

I'm having a program that intermingles data segments into log output: log message log message ----BEGIN INLINE DATA---- data data data -----END INLINE DATA----- log messge I'm looking for something ...
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With grep, how can I match a pattern and invert match another pattern?

With grep, I want to select all lines that match a pattern, and that don't match another pattern. I want to be able to use a single invocation of grep so that I can use the --after-context option (or ...
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2answers
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mv complains about standard input in a pipeline that filters file name with grep

I'm trying to move several .avi files that have spaces in from a CD to my home folder. I've already know how to get rid of the spaces: find /media/mathscd/ | grep -L -r "*.avi" | for file in *; do ...
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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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Using grep to search a file

Re : grep command. I have to search a file for the names of all the students in the school's Linux system. I am able to do this and return about 665 names. (First string of /etc/passwd file). ...
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4answers
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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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2answers
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Show only part of the line found by grep (but not the part that matches the pattern)

In ifcfg-eth0, I managed to grep "DEVICE=eth0" by using grep "DEVICE=" ifcfg-eth0 But how can I grep pattern to show only "eth0"?
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1answer
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How to trick an init script into returning 0

I have a init script which is poorly designed because it does not conform to the Linux Standard Base Specifications The following should have an exit code of 0 if running, and 3 if not running ...
2
votes
1answer
312 views

Search and Filter Text on large log files

I use the tail, head and grep commands to search log files. Most of the time the combination of these 3 commands, in addition to using pipe, gets the job done. However, I have this one log that many ...
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4answers
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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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grep entire filesystem blocks on devices

Command grep -rHinF --colour=always -e "aa:aa:aa:aa" / Output grep: /dev/geom.ctl: Operation not supported by device grep: /dev/devctl: Device busy It seems that grep can not proceed because it ...
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1answer
164 views

How to use awk or sed to convert csv diffs into more readable format

Can anyone give me the example of how to use awk or sed (not sure which one, as I haven't use either of these much, as I have mostly been using grep and cut to work with csv data) to convert ...
2
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3answers
389 views

Printing match groups with grep

I have the following grep: grep -Po 'href="(http://.*)">Transcript.* - ([0-9]*)\. (.*)</a>' I would like to print out the match groups. Is there a way to do this without Perl/Python? I ...
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Multiline pattern match using sed, awk or grep

Is it possible to do a multiline pattern match using sed, awk or grep? Take for example, I would like to get all the lines between { and } So it should be able to match 1. {} 2. {.....} 3. ...
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Using a perl compatible regex with GNU grep -P

I'm using this regex (?<=\[')[^,]* on a file containing the following line disk = ['OVS/sdasd/asdasd/asdasd/something.img, w'] I want that to return OVS/sdasd/asdasd/asdasd/something.img How do I ...
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How to perform a multi line grep

How would you perform a grep for text that appears on two lines? For example: pbsnodes is a command I use that returns the utilization of a linux cluster root$ pbsnodes node1 state = free ...
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1answer
100 views

Retrieving two matches from repeated pattern

How can I retrieve matches from two repeated patterns: mappedname & its value in the text below?. MapName:abc someDiffName=someDiffValue x=3 y=6 NeedyMappedName=NeedyMappedValue . . Flag=true ...
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4answers
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AWK Search massive file and write to variable name

I want to pull data that I will need to reformat from a simulation file I am working with to prepare it as input for running other simulations. The target data is an optimized chemical z-matrix. The ...
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5answers
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Get filesystem name and usage with `df -h`

df -h | grep test | sed -e 's/*%.^ //g;s/.*[ ^I]//' Output: /test /test/drv0 /test/drv1 df -h | grep test | cut -d '%' -f1 | sed -e 's/*%.^ //g;s/.*[ ^I]//' Output: 10 20 15 I want to ...
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466 views

Get all regex matches between two patterns and print them to file

I've got a file with a bunch of long lines. I'd like to grab every group between two patterns and print them to a new file, one match per line. I could manage to do this with Python, but I'd prefer ...