grep a Unix command-line utility which searches input passed to it for lines matching a regular expression, and prints the results.

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How to grep through HTML using GNU grep 2.12 and bash 4.2.37?

I've never used grep to parse HTML files, and am having the following problem: grep -Po "(?s)(<h2>.+?<!-- /endcontent -->)" input.html > output.html -bash: !--: event not found I ...
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26 views

grep: display all output but highlight search matches

in bash, if I want to execute a command and only display output lines that matches a certain pattern, I can pipe it to grep, like file testfile hello there my friends command $ cat testfile | ...
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17 views

grep php output show more than grep query

I'm having an issue where php file | grep "query"'s output shows EVERYTHING, not just the grep'd output. EX: php /vagrant/code/test.php | grep "Do not show anything" Shows anything echo'd in the ...
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22 views

How do I correctly return context from a gnuwin32 grep (grep in windows cmd)?

I want to return a line of context after the string I'm searching for as per grep --help Context control: -B, --before-context=NUM print NUM lines of leading context -A, --after-context=NUM ...
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42 views

BASH : grep count same word occurrence

Is it possible to count the maximum number of occurrences of a word in a string using only grep ? Here is an example of what I want : script.sh "aaaa bbbb ccc bbbb azesd bbbb" would return bbbb ...
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28 views

grep and sed with pipe from tail -f appears to be caching

I am trying to get a working system to monitor special logs. I usually just want a very specific pattern which I extract using grep and a pipe from tail -f. I have noticed that grep does not output ...
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18 views

Grep invert match with context

I am trying to grep a file with invert match, but also not match every line occurring right after the matching lines. So I have the following contents in a file called testing_grep: ...
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22 views

Grep with string comparison: return only lines “higher than” a timestamp

I have an email log file which records when an email went out, and who to. This gets logrotated and so there are a mixture of zipped and unzipped log files going back a week or so. I'm currently ...
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25 views

grep -l output filenames with spaces

I want to loop over files with for f in `grep -rsl "foo" . `: do sed -i -- "s/foo/bar/g" $f; done; But since filenames contain spaces, a filename is split whenever a space is found. How can I ...
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27 views

How to serach for a line which contains specific string in Bash?

I've got a file which contains some amount of lines, I want to look for a specific string, and if the file contains it, then I want to print a different line from the same file. for example, let's ...
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16 views

Grep Whitespace across multiple lines

Given the following in a bunch of text files (.vb): Partial Class [A-Za-z0-9_] Inherits System.Web.UI.Page End Class I'm trying to grep for files that have this basically empty code file, to ...
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39 views

How to grep for line numbers in a binary file?

I'm on Centos 5 Linux and using GNU grep v2.5.1 and looking at a 36GB log file. It is huge and I need to find around a million lines starting from the occurrence of a string 6307459 in the log file ...
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30 views

Why is grep missing missing matches when searching multiple directories?

Trying to grep the files in several child directories, grep returns nothing. ~/box/raw $ grep ":2259\"" f*/hh*.adt ~/box/raw $ But when I descend into one of the child directories, grep finds a ...
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34 views

Why is the Windows Explorer not able to find a UUID string in a list of text files?

I have a directory with all my PUtty log files. Now I would like to find the files containing a UUID. I know that the UUID is in one or more files. I tried it with Windows Explorer. I searched with ...
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18 views

Using grep for text search

I need to search the filesystem for text strings that match some string. I'm trying to get where the commands are used, meaning in which files they are called or used. I need to find every file where ...
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18 views

Find a <a> tag that starts with a space in grep

I want to search an entire codebase for spaces after an < a> tags. They are visible as underlined spaces. Is this possible with regular expressions and grep? My first guess is that I must use a ...
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2answers
37 views

Exclude lines that have duplicate words between delimiters

I have a folder structure that has been (badly) maintained by a number of automated jobs. One of the side effects of these jobs appear to be that it creates duplicate folder names (and subsequently ...
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26 views

ack.pl tool and ack.pl flags + how to ignore files with S attr

I am using the ack.pl tool in order to search string or IP’s in files The official site of ack.pl is - http://beyondgrep.com/documentation/ Example of ack.pl CLI ( want to find the string ...
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30 views

Removing lines in text document that end the same

We have a script that downloads a list of domains for our squid box to block, but we keep getting warnings like the following: 2015/03/02 17:08:47| WARNING: You should probably remove '.artnau.com' ...
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37 views

How to save matching words from output of dmesg in a list

I am connecting USB-Serial devices to my device using different ports and serial-USB devices sometimes show up as 'ttyUSB0', sometimes 'ttyUSB1' or 'ttyUSB2'. How can I write a script to extract all ...
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30 views

Easy way to grep for text in one file only in directories containing a second file

Background: We have a process that is not running correctly. It is supposed to only run on files with patterns like "AAA*.x12". However, it is also running on files similar to "BBB*.x12" Each ...
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80 views

how to grep exact pattern

I’ve tried several grep / egrep ideas with different options but none worked here. I’m trying to grep exact match of the pattern I’m looking in a log. For example I want only a pattern “ERROR” to get ...
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53 views

Piping grep causes error $'\302\240grep': command not found on linux

Sometimes when I'm catting & grepping a file, I see this error come up: $ cat something.txt | grep "some text" -bash: $'\302\240grep': command not found When I re-type the command, it works as ...
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135 views

How to find the total number of processes in Unix/Linux shell script

I’m trying to find the total lines of running processes excepting the commands I’m using to create the listing. Then to parse out the userID and the PID into a new list. All within the same shell. ...
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25 views

grep % through a file

I am running an import job on a really large mysql file that for the most part doesn't have line breaks. Using mysql process list I was able to fine the ID of the currently inserting record. What I ...
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139 views

grep: output specific line after match

Is there a way, using grep, to output the line that falls a specific number of lines after the match is found? For example, I want to output the line with a match, the 8th line after the match, and ...
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52 views

Linux: How to kill a root owned process by parameter's name?

I would like to know how to kill processes owned by the root based on their parameter's information: root 3176 0.0 0.8 3604 2252 ? S 21:33 0:00 sudo python main.py root ...
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40 views

Why grep shows me output that does not contain the search word?

I want to check if the sensu service is installed. I ran this command service --status-all| grep sensu and here is the output vagrant@vagrant-ubuntu-trusty-64:~$ service --status-all| grep sensu [ ? ...
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22 views

Filtering 2nd field from a data set and then using uniq on the output

I've got a dataset that goes like this: AAAAA 11111 Data1 AAAAA 11111 Data2 AAAAA 11111 Data3 AAAAA 11112 Data4 AAAAA 11112 Data5 AAAAA 11112 Data6 AAAAA 11112 Data7 AAAAA 11113 Data8 AAAAA 11114 ...
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2answers
107 views

Chronologically grep or zgrep files in folder depending on file extension (xargs)

I have dozens of folders which contains both plain text log files and gzipped older logs. My goal is just a one liner to run (one folder at a time) to pull up all grep results based on timestamp ...
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38 views

Why chain of commands that runs fine on local doesn't run on SSH?

There's something funny with tail -f and grep -o combination when running over ssh. So on local server, if you do tail -f /path/myfile.log |grep -o keyword It grep just fine. But if you run it on ...
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174 views

how to select nth result on command line without using mouse

I got this alias for searching for a file recursively and case insensitive type fr fr is aliased to `find . | grep -i' and so let's say i'm searching for a file fr nsstring+util ...
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67 views

How to use Continuously (-c) with grep on netstat?

How can I use netstat -c option with grep without repeating the info? Example: sudo netstat -tapc (works fine) I want to do the same but only for the http lines: sudo netstat -tapc | grep http ...
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343 views

Anything faster than grep? [closed]

I am looking for a tool that will be faster than grep, maybe a multi-threaded grep, or something similar... I have been looking at a bunch of indexers, but I am not sold that I need an index... I ...
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33 views

from which file grep found match

when doing something like this: cat *.* | grep mystring is it possible to know from which file each match comes from? If not what would be the alternative?
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54 views

Grep fails to find sequence after assign to variable

I run: awk -F ',' '{print $2}' data.dat | sort | uniq | tr '\n' ',' | grep "*)>nS4XkrlH @XUL" and the sequence is located in results. Then I run b=`awk -F ',' '{print $2}' data.dat | sort | ...
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64 views

Can I create a “file” that, when opened, actually gives the output of a command?

I've found myself in a couple of situations now where I'd like to have such a "file" that essentially runs a script whenever it's "opened", allowing me to "read" it's output. For example, I might ...
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440 views

CygWin: grep command shows some “binary file coincidence” message

I have been googling about this, but, maybe due to my spanish version of CygWin/Windows, I have not been able to find a solution. I have latest (December 2014) CygWin 32 bits installed, and it seems ...
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Breadth-first search with ack or grep

When I search e.g. my home directory with ack (or grep), I normally want to know where I set a specific option. Since most config files are really close to ~ it would considerably speed up ack if I ...
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41 views

Make perl regex search exit with failure if not found

With grep I get a failure return code/exit status if no result is found. How can I do the same thing with perl? Basically, I would like to change the following so that it exits with status 1 if no ...
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19 views

Including and excluding in one regular expression

We're using HP SiteScope system at work to monitor logs and get alerts when a special string or combination of strings is caught. There is one field where the regular expression that catches the ...
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42 views

Parsing XML log in shell

I have to parse a very large log file and I want to use the command grep (or any other tool). I am currently using PuTTy. I want to search for each log line for a specific string (let's call it AWB) ...
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6answers
188 views

How to match everything from after the last YAML delimiter onwards

I normally use grep to search for a pattern in a string. However in this particular instance I have to identify a YAML header, also, it ends with a triple dash. My test.info file has the following ...
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15 views

Find specific files by name and create a summary file containing info from them + name of their directory

I've a directory containing subdirectories (each of them containing also directories). I want to find into this directory all files names "Log.txt" ( and in each subdirectories). And to grep each of ...
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fit grep syntax from linux to solaris

The following command grep -w '^[^#]* machine_VIP' /etc/hosts | head -1 | awk '{print $1}' works fine on linux (its capture the machine_VIP alias and return the IP address from /etc/hosts and ...
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41 views

Showing filenames when grepping from mysqlbinlog

I am trying to find out when some queries have been executed on our DB. For that I started looking in MySql binarylogs, using mysqlbinlog: find -name "binlog.000056*" -exec mysqlbinlog {} \; | grep ...
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95 views

Can grep show context, but not a full line?

I have a file with several very long lines. I want to grep for a string which may occur several times in the file, including possibly more than once on the one line. $ cat 2014-11-03.json | grep 218 ...
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18 views

Terminal command to show lines of a text file n characters long?

Is there a way to output only the content of lines in a text file that are 'n' characters long? Ex: 1.txt a aa aaa aaaa aaaaa "Print lines(5)" would return "aaaaa" Maybe some grep magic can do ...
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1answer
58 views

regex not working as expected in grep

My problem is about a regex. Thanks to regexr, I managed to write up an expression that matches the interface name route linux command gave me. But I can't catch it with: route | grep -Eo ...
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21 views

how to print pattern match

I am trying to get versions for services in a gnmap file. A typical line looks like: Host: 192.x.x.x () Ports: 21/open/tcp//ftp//HP JetDirect ftpd/, 23/open/tcp//telnet//HP JetDirect printer ...