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

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grep command to extract data from a file

I have a file that has this line in it: $n22(s:Tstring) = "252"; I'm trying to write a shell command to grep the file and only return 252. This is what I have so far: grep -o ...
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2answers
134 views

Cat, Grep, Redirect Output… Blank File?

I just ran cat /opt/webapplications/Word/readme.log | grep -v 'Apple' and I got the output on the cli that I was expecting, which was all the lines in readme.log that did not contain 'Apple'... ...
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How to kill/close log files that are open through lsof grep deleted?

I have a deleted a large log file from our servers. so I executed this command to validate. lsof -nP | grep '(deleted)' and this showed up. how can I permanently delete the results fo this lsof? ...
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1answer
15 views

Search lighttpd access log

The access-log on my lighttpd server is kind of huge, apx 5GB. Now I need to extract all data from a given date, 12th of February, from the log file and if possible save to new file. Is it possible ...
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2answers
69 views

Using GREP to Find Text in Files

I'm trying to use grep to find a specific line of PHP code I know for certain is present in several files, but all I get back is an empty result. Please advise on how I need to modify my grep query: ...
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2answers
73 views

Update grep on Ubuntu through apt

Say, I currently have grep version 2.2 on my system and I would like to upgrade to version >= 2.5. Other than installing grep through source code, is there a method to update grep using Ubuntu (apt) ...
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1answer
17 views

grep the result of cdrecord or wodim

I would like to parse the result/progress of a running cdrecord -v burn process. What I tried so far was cdrecord -v dev=/dev/sr0 -data foo.iso 2>&1 | grep -E 'Track [0-9]+:.*written'. ...
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2answers
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Find all files which contain pattern in directory of tar files

I have all tar files in a directory. I want to find some files in tar files without extract all tar files. I know how to work with one tar file: tar tvf abc.tar | grep xyz I want to find in all tar ...
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1answer
53 views

Grep is not working without having read permissions [closed]

I am in a folder where I do not have read permission in contents. ls -l List all files sucessfully. I want to count files that have some attributes in their name with: ls -l | grep ...
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1answer
37 views

delete a line if it contain a particular match from a file in bash

I have a file contain lines like the following. 10 TEST NO SOMETHING 20 TEST YES SOMETHING 101 TEST YES SOMETHING 100 TEST NO SOMETHING How can I delete only the line that ...
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2answers
140 views

How do I programmatically convert putty logs to human-readable, searchable files?

Background: I have a Windows 7 workstation and use PuTTY for SSH connectivity to Linux servers with session logging enabled. I previously used the Printable output option but that has the benefit of ...
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1answer
38 views

Unable to use grep regex to search for filename containing period

Ubuntu 14.x. Using grep to search for all files linuxtest-client2. This includes multiple file extensions (csr, crt, key). When I grep for the middle portion of the filename, "2.", it also returns ...
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1answer
36 views

shell script to grep within range inside of cron

I'm trying to create a shell script that would look for ERROR inside of /var/log/jbossas/standalone/server.log, such as following: # grep ERROR /var/log/jbossas/standalone/server.log 10:36:37,530 ...
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2answers
196 views

how to replace one url with another using sed inplace replace in multiple files?

As you can see in the script example down there, I'm trying to find and replace (inplace replace) a string which is part of an URL with another string (url part) within ALL files found with that ...
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3answers
193 views

word wrap in ssh session not working with grep

When I ssh to my Linux servers and use grep like this: grep 'timeout exceeded' logfile | less word wrap does not work. However, if I use the same command but use less first, like this: less ...
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2answers
326 views

Tail, grep and count the instances found in one command?

I am tailing a files output and grepping for lines with certain data. I don't want to output the data to the screen but instead count the number of instances it found and send that to the screen. The ...
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1answer
48 views

How can I visualize a file removing every type of comment if a file (including /* */)? [closed]

I have this small script to visualize config files without the comment lines: cat $1 | grep -Ev '[:blank]*#|^[:blank]*$' | pygmentize -g but it still shows some comments in some files when they have ...
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1answer
140 views

is it possible to search only a files that have specific extended attributes set?

is it possible to search file in the linux OS that have particular extended attribute as this: ---S--l--- ---S--l--- 1 root root 0 Mar 1004:25/opt/csTuner/iba/wys/tuer_lolk What is S ...
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1answer
432 views

How i can dump raw packets from an existing tcp socket using tcpdump on Mac and Linux? [closed]

Once I know the IP address and port number combo, I can run this to see some of the packets: tcpdump | grep [IPADDRESS] Anybody know how I can now see the raw packets too? Thanks!
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6answers
4k views

grep lines after match until the end

I have following output from git status, how do I grep for everything after Untracked files: [alexus@wcmisdlin02 Test]$ git status # On branch master # # Initial commit # # Changes to be committed: ...
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3answers
56 views

Extracting the date of the latest message from an mbox file

How would I go about extracting the "Date:" header for the latest received message in an mbox file? Note that it's not simply an issue of grep'ing for the latest occurrence of "^Date:", since it ...
0
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1answer
36 views

Grep a textfile with (find generated) files, but ignore paths

I receive a huge textfile generated with find. The contents of the generated textfile are a file-referenes with full path, i.e.: //server/dir1/dir1foobar.ext //server/dir1/dir2/dir1bar.ext ...
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2answers
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Script to email if grep result is null

its been a long time and I cant seem to remember how to do this. I am trying to grep a logfile for a word or words and email if it does not exist in the last fifteen minutes ( I will be setting a cron ...
2
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1answer
77 views

how to get the desired value in bash shell from the lshw output?

I want to extract the info from lshw output where it says: -cpu product: ...... I want only the product info of this -cpu. How can I do that with awk or sed?
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3answers
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How to grep (or other command?) for first instance to last instance in a log?

How does one grep/search a text file so that the results show the first line with the string, and then every other line until the last line with the string? So, if I have a file that looks like this: ...
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5answers
640 views

Get the pid if 2 tomcat(s) is running

I have 2 tomcat's running, how do I get the pid if both have similar names? ps -ef | grep java root 12952 1 0 10:01 pts/0 00:00:03 /usr/lib/jvm/jre/bin/java ...
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1answer
730 views

grep ouput filepath with file modified date?

Is it possible to make the grep command to output file paths with file modified date like so: 12-02-2015 /file/path/to/the/file 16-02-2015 /file/path/to/the/file 25-02-2015 /file/path/to/the/file ...
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2answers
324 views

How to grep directly to ftp?

What is wrong with this syntax? How to write output directly on remote ftp because lack of space on HDD? This command is working but there is no HDD space to get the full result: find /somedir/ ...
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1answer
71 views

Finding strings in files with relative path

I don't understand why this two commands don't provide the same result (the differrence is only relative vs. absolute path), can somebody explain it? annika /srv/www/pages/com.example.www/www/povruc ...
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1answer
436 views

How to grep a continuous stream, with paging

I posted this to Superuser but got no takers: http://superuser.com/questions/832578/how-to-grep-a-continuous-stream-with-paging I want to take a log file and filter out some irrelevant log entries, ...
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grep behaving differently on Fedora vs Ubuntu

So when I run this in Fedora I'm seeing this: $ ls hmm_data/indivA12_AATAAG/refs/par1/ 2R-orths.alleles 2R-ref.alleles $ ls hmm_data/indivA12_AATAAG/refs/par1/ | grep -F '-ref.alleles' ...
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71 views

Tail grep what tools are for it

I would like to run the following command: tail -f /var/log/syslog | grep -ri 00:16:CB:1E:AF:CA In Linux but it does not working. How would you interactively grep certain text from log files?
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Nginx - change status code based on grep of process list or similar

We are using nginx as a reverse proxy in our cloud infrastructure, and it's pretty handy. I'd like to use it for something else though. On some of our VMs, there is a process that I need to be able ...
1
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1answer
118 views

Regex matching first word and any word

I have a log file with a list of many entries. With grep regex I want to match the first word and another word which can be anywhere in the string. For example, if I specified "user1" the search ...
5
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1answer
434 views

screen causes “tail -F | grep” to echo unmatched lines

This is Ubuntu (3.13.0-29-generic #53), trying to do a simple bash script to monitor a log file for matching lines. If I do the following, there is no output in the bash shell except for matches, ...
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1answer
1k views

Need help grepping postfix log

I'm trying to search for an unknown string (Message ID) in a log based on a known string (recipient address), and then grep the unknown string to output the entire relevant log information. I'm able ...
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2answers
189 views

find and replace multiple files using a file as input to find and another to replace

I need to replace several chunks of text inside some php scripts... i have: find . -name 'products.php' -exec grep --silent 'TEXT_TO_FIND' {} \; -exec ls {} \; -exec sed -i ...
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2answers
595 views

Parse Apache logs for specific verbiage within the last hour

I'm looking to parse my /var/log/httpd folder which contains a lot of Apache log files. I'm looking for specific events within the last hour. I've tried the below, but I didn't have any luck. grep ...
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3answers
90 views

Equivalent of grep -l for filenames in zipfile

Given a set of zip files, is there an easy way to list only those zipfiles that contain files whose names match a given pattern, cf. using grep -l to list only files whose contents contain lines ...
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1answer
75 views

Refine grep look behind to avoid numbers

When I query docker images, I get this: #> docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE local/debian 7.5 172c7702a46f ...
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How to report filenames found by strings after being piped through grep?

I've been around *nix long enough to remember having done this in the past, and now those neural pathways are gone... I'm searching /usr/local/lib for files that contain img_convert because I'm ...
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1answer
196 views

Plesk Unable to exec utility listmng: Cannot find grep program System error 2: No such file or directory [closed]

I have a little problem with my plesk installation at the moment and unfortunately do not have enough knowledge to solve it on my own. I would therefore be glad if I could get a hint on this. I tried ...
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382 views

Bash/grep: ignore lines over N characters

I have a find/grep command that i use to search my projects' codebase, thus: find folder1 folder2 folderetc -print | awk '{print "\""$0"\""}' | xargs grep -n "search-string" Something that ...
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Capture piped multiline grep output into a variable

I'm using Zabbix's zabbix_sender.sh script to push exception stack traces to my remote Zabbix monitoring server. zabbix_sender.sh requires a key and a value for any data that it sends. It can read ...
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1answer
599 views

Get some meaning from apache logs with awk and grep [duplicate]

I am trying to have some meaning from my apache log files: I want to parse my access log and have some statistics about 200 status code hits (how many times each of them was hit). So I tried to learn ...
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1answer
99 views

How to comma-demilit the output from cut?

So far, I have this: grep -B 36 'pattern1' Mapper.1.Configuration.MapRules | grep "pattern2" | cut -d'"' -f2 which give me a new-line delimited list of values that I need. I could put this into a ...
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4answers
1k views

Sieve: filter subject with regex, file into mailbox named match

I am trying to filter mails by subject with a regular expression. The subjects I want to match are read like [git-foo] some more text where foo is the string I want to check for. I end up with the ...
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1answer
277 views

Invalidating email addresses from sql dump before import

Synopsis I would like to import production data into the development environment so testing can be done in an almost accurate way. Of course I need to invalidate e-mail addresses as I don't want ...
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1answer
41 views

How to find file which have not specific content?

I have a lot of files which already have SPF records defined grep -i v=spf *.db /var/named/domain.com.db domain.com. 14400 IN TXT "v=spf1 +a +mx +ip4:XXX.XXX.XXX.XXX ?all" And want ...
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1answer
362 views

linebreaks between results in grep

I need to occasionally monitor a spider that I have running on my server. I'm testing it to see how many iterations of it are running concurrently and to see if any of them are hanging. I use this: ...