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

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2
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2answers
217 views

How can I enhance the output of find and grep?

I really don't look forward to having to do find/grep because the output, as returned by find . -exec grep sometext {} \; -print is just not very easy to read even when you dump it in a file. What ...
11
votes
6answers
701 views

How can I grep a directory based on the contents of two successive lines?

How can I grep a directory for lines that contain "Foo", but only get matches when the next line also contains "Bar"?
3
votes
2answers
510 views

how to grep for c:\

I'm using cygwin's grep to find all instances of hardcoded paths on c drive. doing: grep -r "c:\\" . gives grep: trailing backslash Does anybody know how I can do this?
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vote
3answers
5k views

bash merge 2 lists removing duplicated

I have an embedded linux system using Busybox (OpenWRT) - so commands are limited. I have two files that look like: first file aaaaaa bbbbbb cccccc mmmmmm nnnnnn second file mmmmmm nnnnnn ...
3
votes
3answers
2k views

Average rows with same first column

Given a file with two columns: Id ht 510 69 510 67 510 65 5l0 62 510 59 601 29 601 26 601 21 601 20 I need a way to coalesce all rows with the same ID into one that has an average height. In this ...
11
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3answers
3k views

Online grep exercises?

Are there any online grep tutorials that would feature some online tool for performing exercises? For example, having some predefined text sample and being told what patterns to find and so forth? It ...
5
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4answers
2k views

Why does grep not work with redirection?

Using the top command with redirection works fine: top > top.log Now I want to use grep to filter a certain line: top | grep "my_program" > top.log But the log file will remain empty. But ...
13
votes
2answers
43k views

Can grep return true/false or are there alternative methods

I'm trying to write this script for an assignment - it's only the second one I've written so bear with me. As a part of this script, I need to be able to check if the first argument given matches ...
3
votes
4answers
369 views

Grep one liner to remove blocks of random text

Using a script to backup some Cisco routers and compare startup and running configs. My output is tarnished by some ssl certificates it returns - I wish to remove them. Given: ********* ERROR ...
2
votes
3answers
622 views

Which is a better way to search- find with regex or find with grep?

Of these two ways of searching a file recursively in all the subdirectories, which is faster / better ? find . -regex ".*/.*abc.*" or find . | grep ".*abc.*"
4
votes
3answers
3k views

How do I use tee to redirect to grep

I don't have much experience of using tee, so I hope this is not very basic. After viewing one of the answers to this question I came across a strange beheviour with tee. In order for me to output ...
4
votes
3answers
506 views

Use command grep and locate

How I can make the grep command locate certain words in the files specified by the routes found by the locate command? locate my.cnf | grep user (I want that grep command search the word "user" ...
3
votes
1answer
185 views

grep for n or more periods on a given line

I want to be able to arbitrarily match lines that contain a lot of periods, like this: $ echo "there's. someone on the wing. some. thing." | grep -stuFF [[:idunno:]]{4,} there's. someone on the wing. ...
2
votes
5answers
2k views

Need to grep file with specific letter and move to another folder linux

I need to select files which contain "Error" or "traffic" in their names, e.g. abc_ERRor.csv raError.csv bsn_Error.csv bbbctraffic.csv ccc_traffic.csv ... and move them into corresponding ...
0
votes
5answers
7k views

compare two files get identical list

file1.txt (50 lines) TERYUFV00000010753 TERYUFV00000009526 file2.txt (500 lines) TERYUFV00000009526 refids_739_known_8/10_target TERYUFV00000018907 refids_12023_known_21/22_target ...
3
votes
2answers
2k 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 ...
4
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3answers
2k views

shell script to read from multiple files in parallel

I need to write a script that runs parallel and looks for a string in multiple files. I tried a lot of options but they slow down the speed of my processor.
13
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6answers
13k views

How do I list every file in a directory except those with specified extensions?

Suppose that I have a folder containing .txt, .pdf, and other files. I would like to list the "other" files (i.e., files not having the extensions .txt or .pdf). Do you have any advice on how to do ...
2
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3answers
120 views

Need to parse a double entry table with two pairs

I have this two-entry table resulting from a program output: Variable1 : Value1 Variable2 : Value2 Variable3 : Value3 Variable4 : Value4 Variable5 : Value5 Variable6 : Value6 ...
3
votes
4answers
449 views

Display lines inbetween text with grep

I know that I can use the -A and -B command for grep to get a lot of what I am looking for however that is not quite what I want. I am looking to parse the httpd.conf file to search for a domain. ...
4
votes
1answer
6k views

Find and remove many files by specific content [duplicate]

Possible Duplicate: Arg list too long error while using find I try to find many files in many folders with specific content, and delete them. find dir.*/* -exec grep -l "content" {} \; | ...
16
votes
3answers
9k views

Piping from grep to awk not working

I am trying to grep the ongoing tail of file log and get the nth word from a line. Example file: $ cat > test.txt <<EOL Beam goes blah John goes hey Beam goes what? John goes forget it Beam ...
3
votes
1answer
329 views

grep list of names and information from bigger file

I have two files: one with list of names (500 entries) and other having some more information for each entry in A.txt and extra entries too. File A.txt (each line is starting with > (fasta format) ...
2
votes
2answers
105 views

reformat a text file to have all text on one line using CentOS 5.6

I have a 210-line block of HTML that I have stored in a HTML for debugging purposes. The HTML, as you would expect, is formatted accordingly so is stored in the file with spaces and tabs. Is it ...
0
votes
1answer
423 views

wget images with certain path

im looking to only grab images from a document with a certain path for example domain.com/uploads/287167/file_name.jpg only grab those with the uploads/number/filename im currently doing it this ...
4
votes
1answer
5k views

Delete last character in a word but only if the character is there - in bash

How to remove last character only if it's there? input: OpenOffice.org/m openOffice.org/ozm Pers. Pfg. phil. Prof. resp. Roonstr./m roonstr./ozm desired output: OpenOffice.org openOffice.org ...
2
votes
3answers
133 views

Finding out how many programs I have not installed from a list with grep/awk in archlinux

I want to see how many packages from a list are not installed. I use archlinux, so I use pacman -Q to determine if a package is installed. If it is not installed, it returns a message like: "error: ...
7
votes
1answer
986 views

grep --color adds ANSI code ESC[K - This can change displayed text

Why does grep add ANSI code \e[K to its colored output? I can't see the point of it, but obviously the developers can. It is an ANSI/VT100 Terminal code which is used to "Clear line from current ...
4
votes
1answer
2k views

Bash, remove lines containing string with grep

This is currently deleting the whole contents of the file in question: #!/bin/bash rpc_port="9201"; dir="/etc/apache2/ports.conf" cat $dir | grep -v "Listen $rpc_port" > $dir The file contents: ...
2
votes
1answer
486 views

Oneliner to detect camelcase variables

I would like to insert some style tests as git hooks in order to stick with precise style rules. How can I come up with a oneliner that detects and prints arbitrary camelcase variables like the ...
7
votes
3answers
1k views

Print a line only if the next line does NOT contain a particular match

I am trying to search a log file for logged activities that did not complete. For example, I log a "Starting activity for ID 1234..." and if successful, the next line will be "Activity 1234 ...
4
votes
3answers
2k views

Why piping find and grep returns nothing?

I'm trying to have grep search inside specified files that are returned by find: find . -type d -name 'mydir*' -exec find '{}' -name '*.java' \; | grep 'MyClass' This doesn't work. Meanwhile, ...
6
votes
1answer
711 views

Peculiar piping grep/head behavior

I'm helping the netadmin here with a perl regex to automate operating on some snapshots from our SAN and our scripts does stuff like this: varinit1=$(iscsiadm -m session | grep rbmsdata1 | head -n1 | ...
6
votes
3answers
13k views

Pipe find into grep -v

I'm trying to find all files that are of a certain type and do not contain a certain string. I am trying to go about it by piping find to grep -v example: find -type f -name '*.java' | xargs grep -v ...
0
votes
1answer
352 views

PHP file recursive change array key on find [closed]

I used PHP array $lang['module']['1'] = 'Title'; $lang['module']['2'] = 'Title2'; $lang['value'] = 'text123'; how i can use replace in terminal Key Value to CASE UPPER ? $lang['VALUE'] ...
4
votes
4answers
3k views

cut / grep and df -h

How can I grep or cut the "173G" under "Verf"? I need this for Unix scripting in school. jonas@jonaspc:~/$ df -h /dev/sda2 Dateisystem Größe Benutzt Verf. Verw% Eingehängt auf /dev/sda2 ...
2
votes
1answer
631 views

How can I use unix tools with Cyrillic text?

I recently started processing Cyrillic text, and it's been really difficult. I couldn't get my Python scripts to work with it at all. And I tried. PHP worked well, but I don't know PHP. I just ...
2
votes
2answers
2k views

How to do a regex search in a UTF-16LE file while in a UTF-8 locale?

EDIT: Due to a comment Warren Young made, it made me realize that I was not clear on one quite relevant point. My search string is already in UTF-16LE order (not in Unicode Codepoint order, which is ...
2
votes
3answers
2k views

Grepping several lines from Nmap output

I apologize in advance as this is a simple question. So I'm attempting to scan a Class C to identify all mail servers by IP. The vast majority of IPs aren't mail servers. I'm trying to filter out the ...
4
votes
5answers
749 views

grep second time faster

Suppose I do a time consuming recursive grep search. After seeing the results I want a different output; for example I want to add the option -C 3 for 3 context lines. I can do the whole search again ...
1
vote
2answers
750 views

Is there any other way to use tail -f for grep -q && operation?

I found this solution: http://stackoverflow.com/questions/7178888/grep-q-not-exiting-with-tail-f but is there any other possible? UPD: I want to do tail -f | grep -q something && echo ...
1
vote
4answers
2k views

Grepping over a huge file performance

I have FILE_A which has over 300K lines and FILE_B which has over 30M lines. I created a bash script that greps each line in FILE_A over in FILE_B and writes the result of the grep to a new file. ...
6
votes
1answer
587 views

inexact text search

Is there any utility like grep or even uniq but for inexact search or I should write it myself? I mean it will look at 90% (number may vary) matching, or smth like that. For example I have file with ...
0
votes
1answer
2k views

last modified with grep

I'd like to make a list to stdout of the files modified in the last two hours in the . directory using grep. It has to be automatic (can't ask user what time is it or similar stuff) and I have to use ...
7
votes
2answers
5k views

Where does grep -r search by default?

I found if I search using grep without specifying a path, like grep -r 'mytext' it takes infinitely long. Meanwhile if I search with path specified grep -r 'mytext' . it instantly finds what I need. ...
1
vote
2answers
674 views

Weird zsh grep -P behaviour

I connect to server with PuTTY from Windows. I have a long yet not touched (I suppose) by hands of local admin config: $ cat /opt/jira/.subversion/config ... ### must be enabled, which is ...
3
votes
3answers
487 views

“Grep-ing” from A to B in hexdump's output

Here is the situation: I have to find in the output from an hexdump the bytes between a string A and a string B. The structure of the hexdump is something like: -random bytes -A + useful bytes + B ...
1
vote
2answers
519 views

How do I generate a list of the characters occurring before a certain character only in lines that contain another certain character using regex?

I know that's super confusing (total noob-sorry!). To clarify, I have a text file that looks like this: 407-OL? 408-2-OL? 408-OL? 418-het? 420-1 and 2- OL? 429-2-left unscored? 430-2-left both ...
3
votes
4answers
12k views

How to find the total number of occurrences of text and files with find command

I am trying to run the find command to find the total number of occurrences of a particular text string and also the number of files which has this text string. What I have right now is this command. ...
3
votes
2answers
206 views

Is there a global grep.conf in Unix/Linux?

I would like to make a utility that always enables the --color argument for the grep command in any distribution. Is there a way to do this or do I have to search for a way for each distribution?