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

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insert complex line before or after complex line

i have file with complex text print("ERROR: passwords don't match") password = hash_func(password.encode("UTF-8")).hexdigest() i need to insert this text between them with open('/etc/openvpn/...
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1answer
40 views

Searching for most recent file (Display Unique)

If i have a Folder structure with 10 Sub dirs Each sub folder has the possibility to hold a version of a file (Older or newer) "Poor folder structure." I was looking to use Find to locate all files ...
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35 views

How to use gnu parallel to improve grep within while a loop [duplicate]

I have this loop as you see it makes two greps. The files are huge and grep are very slow.How I can implement gnu parallel in this loop? while read lemma stem POS do date "+%T ${lemma}..." grep -E " ...
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3answers
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Grep in many directories, but only look in each dir's specific subdirectory, not all sub dirs

My case: dir1 subdir1 FooFile subdir2 dir2 subdir1 FooFile subdir2 So, if I cd dir1, I can easily do something like find . | xargs grep "Foo" in order to list the names of ...
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1answer
88 views

Perl one liner to find words longer than 63 characters

I have a number of XML files containing sanskrit texts to be converted to tex. Latex has a maximum of 63 characters per word for its hyphenation to work, everything longer than that will not be ...
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1answer
71 views

Remove files with match only from some subdirectories

I have a directory with several subdirectories; in each of these, I have some files. I want to perform a grep only for some subdirectories to find those files that match the query and remove them; ...
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2answers
39 views

Sed from line 6 on from all txt files and being able to output all the results in a single file

I need to sed from all *.txt files from line 6 until the end All the results should be in a new single file with the name of each file preceding the results Example: Having different txt files the ...
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2answers
59 views

using awk to unzip files in directory

I have some zip files in directory when I need to unzip each in specific dir I used ls | awk '{ print "unzip " $1 " -d " $1} ' unzip p21286665_121020_Linux-x86-64.zip -d p21286665_121020_Linux-x86-...
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2answers
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Why is egrep [wW][oO][rR][dD] faster than grep -i word?

I've been using grep -i more often and I found out that it is slower than its egrep equivalent, where I match against the upper or lower case of each letter: $ time grep -iq "thats" testfile real ...
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1answer
50 views

how can i extract the second and third word of a line{that starts with 9} from a file where words are seperate with |? [closed]

case "$3" in -id) echo "Lines matches with the pattern $4 :" #grep -oP $4 $2 ;; esac
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1answer
38 views

Remove pattern from a line in file with Grep/sed/awk combo, pattern is another column

I have two columns (or could separate as two files) in a huge file and i need to remove the duplicate city name in the state/area column. los angeles los angeles ca, usa, west new york ...
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3answers
48 views

Strings - Extract File Version Recursive

I have been using strings to extract and compare file versions between directories. I don't seem to be able to do this recursively. The method I have been using per file is: strings -e l ...
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3answers
53 views

How can I get the seprate results for each pattern from multiple grep

I would like to search 14 different patterns within 100 files. At the moment what I tried cat s_3_2_*_qseq.txt | grep -c 'pattern1\|pattern2\|pattern3\|pattern4\|pattern5\|...pattern14' This ...
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2answers
58 views

Using Grep Command Without Specifying a Certain Directory [closed]

Can you use the grep command without specifying a directory path afterwards? Example: $ sudo grep "filename" / I have also tried this: sudo find / -type f grep -l "filename" Still no luck. ...
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4answers
78 views

cat results of grep

I am trying to concatenate the results of my grep search. my grep search finds about 4 files on my system and outputs them in a new line for each file. I thought by passing this information to tr '\n' ...
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2answers
105 views

Using Both Grep and Cut

I want to grep the output of tcpdump and cut some part of it but the command below is not working. tcpdump ... | grep -i --line-buffered "..." | cut -d'&' -f1,2 Do you know what is the problem? ...
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3answers
71 views

highlighting parameters in with grep

I'm in need of some assistance with using the highlight feature in bash. My goal is to grep three parameters and then highlight them with three different colors. I've been messing around with this ...
3
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1answer
74 views

How to optimize 'grep'-and-save?

I want to know on which node my calculations were running on our cluster in case the node crashes and I get no files back to know on which node I have to search. For that case I wrote a little script ...
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1answer
37 views

List lines that consist of a single non-vowel character

I need help with listing lines that consist of a single non-vowel character. I got this: ls | grep -nv '[aeiouy]' file But this doesn't give me a single character. How do I get just a single ...
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2answers
79 views

List files that don't have certain letters in the first two character

I need help with listing filenames that are at least two characters long and don't have the following letters in the first two characters. The letters are abcfghxyz So far I have: ls | grep -v '^[...
3
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3answers
287 views

non-greedy grep

I want to grep a link from an external file example.txt. example.txt containins: (https://example.com/pathto/music.mp3)music.mp3 the code: egrep -o -m1 '(https)[^'\"]+.mp3' example.txt output: ...
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3answers
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How to search efficiently for a list of strings in a big code directory

I have a list of strings, for every of those strings, I want to check if it occurs in a big source code directory. I came to a GNU grep solution that gives me what I want: for key in $(cat /tmp/...
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1answer
91 views

Search file name within file

Someone put a lot of malicious code onto every single wordpress instance on my server. For the second time. (At least) Every js file has been modified. There is a pattern though, the code always looks ...
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1answer
47 views

How to test if certain strings existing in file are present in another file?

I have a file sites.txt that is generated by a script. It's a list of host names. I have another list of host names sites_old.txt. I need to check whether any of the host names present in the sites....
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Grep-like tool to show a specific region of a text relative to a pattern

I have this kind of text message published at a high frequency: pose: - position: x: 0.0 y: 0.0 z: 0.0 orientation: x: 0.0 y: 0.0 z: 0.0 w: 1.0 ...
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1answer
36 views

Why is there an error when grepping man results?

I am running this command, attempting to grep the output, but I keep receiving this error and I don't understand why. man man | grep color <standard input):977: warning [p 8, 0.8i, div '3tbd1,0'...
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4answers
379 views

How can I use grep to display lines WITHOUT either of two specific strings?

For a large logging file, how do I display those lines without "success" or not terminated with "ok"?
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3answers
98 views

How to add a different prefix to every line in a grep output?

I currently have this code: cat /proc/cpuinfo | grep "MHz" | cut -d ':' -f2 | sed 's/.*/Core NUM&Mhz/' Which outputs the following (for 8 cores): Core NUM 1941.054Mhz Core NUM 1949.820Mhz Core ...
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2answers
91 views

Grep only in files that are in certain folders

I want to grep for interesting string, but only in specific folder/file combinations, such as myfolder/myfile.out. The directory I'm grepping from may have these combinations in subdirectories of ...
0
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1answer
214 views

How to use negation of a command in a while loop with grep in shell script?

Is there any way to use while loop and grep all together? See my example: while [[ !(grep -R -h "${text}" ${path}) ]]; do ... done It says: ./test_script.sh: line 1: conditional binary ...
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2answers
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How to find/grep what is between string1 and string2?

I am trying to extract a value from a long string that may change over time. So for example the string could look something like this ....../filename-1.9.0.3.tar.gz"<.... And what I want to ...
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1answer
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Issue with grep, egrep in solaris

I have an issue when I execute this command in Solaris: grep -Ev "(^#|^EBM_SERVER|^$)" ${EBM_CONF} | awk -F, '{print $2"|"}' | tr -d "\n" | sed 's/|$//g' I got this error message: egrep:illegal ...
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2answers
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How to use a greped url provided by tshark inside a bash script?

I'm trying to use a url piped from tshark into a while loop. while read line ; do echo "$line" ffmpeg -i "$line" -c copy "filename" done < <(tshark -i tun0 -B 50 -P -V -q -l -Y 'http matches "(...
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1answer
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How to grep a string in multiple files on basis of month

I have a set of multiple log files and i want to search specific strings from those multiple log files between time period say July to October 2015. Please note there are multiple log files for each ...
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3answers
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Extract Strings from Web Log file

Given a file containing web access logs for a YouTube video, every line is a hit and is in the format. 62.172.72.131 - - [02/Jan/2003:02:06:41 -0700] "GET /random/html/riaa_hacked/ HTTP/1.0" 200 ...
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Suppress warning of rbenv versions if no rubies installed

At the moment I'm working on Ansible role that installs ruby with rbenv. In order not to install same ruby version every time I run setup task I have to check that no needed ruby is already installed. ...
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3answers
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Print lines after pattern in several files

I have a file with the same pattern several times. Something like: time 12:00 12:32 23:22 time 10:32 1:32 15:45 I want to print the lines after the pattern, in ...
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3answers
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Can I grep two files against each other?

I want to grep file A for every phrase in file B, where a phrase is a string of words of length X. Ideally, it would be an approximate grep, like agrep. Is there a way to do that using command-line ...
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2answers
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How do I ack-grep exclude file type *.sql files or file size larger than >3MB?

I want to search my directory for "foo" in the files, but i have these gigantic sql files. How do I exclude these file types or file sizes larger than 3MB using ack-grep? Also how would this be done ...
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2answers
45 views

Is there any tools that will let me check String length of XML Node

Am wondering if there are any tools that will do this: Exmaple XML: <node1> <Data> <Unique>123456789-1234567891</Unique> </Data> </node1> What i was hoping ...
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3answers
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I want to grep out a text string from many files, how can I run a loop for this

I have a thousand .xyz files, all numerical data and in the same directory. Some of them have the text string "END" at the very end of them. I'm not sure how to loop a grep command so that it removes ...
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2answers
37 views

Egrep back referencing not working

I have trying top back reference the first captured group in the below command: $ ls -lR | egrep 'd(rw(x|s)|rw-|r-(x|s)|-w(x|s)|r--|-w-|--(x|s))(rw(x|s)|rw-|r-(x|s)|-w(x|s)|r--|-w-|--(x|s))---' drwxr-...
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Find files with the exception list of file name in separate file

I have 10 files in a directory.. test1.txt test2.txt test3.txt . . test10.txt Also a exclude file names exclude.txt which have the below file names test1.txt test2.txt test3.txt text4.txt I need ...
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Need some help on awk/grep command on shell script

This is in reference to Need some help on grep command on shell script I have a log file and I am trying to write a shell script to find pause/play happening or not (Success /Failure). The script ...
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3answers
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How can I parse JSON to test the string value of a nested key?

For example, here is my program's output (bspwm, if you wanted to know): { "id": 29360131, "splitType": "vertical", "splitRatio": 0.5, "birthRotation": 90, "vacant": true, "sticky": false,...
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2answers
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Listing lines that start with a number and end in a sequence [closed]

So basically, I need help with listing lines with their line numbers that contain one or more words that start with 42 and end in a sequence of any number (but not zero) of character X. so far what I ...
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2answers
59 views

Shell output from one command as input to other

I am trying to automate Forever JS to keep my dev server running and for that I need to check and stop the forever process to start another one. By running sudo forever list I get the following ...
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2answers
133 views

Print lines of a file between two matching patterns [duplicate]

How can I print all the lines between two lines starting with one pattern for the first line and ending with another pattern for the last line? Update I guess it was a mistake to mention that this ...
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0answers
45 views

Standard deviation of number next to a pattern

I have a file with lots of tags with a number next to them, set out like this: <Score>4 ... other data <Score>2 ... other data <Score>3 and so on... I have used grep to get the ...
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2answers
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parse HTML in Bash (when grep just isn't enough)

This is driving me insane, as I'm sure there must be some program doing the job but I just can't find it. To be noted, I'd be on ARM/Raspberry so unfortunately Xidel is not an option here, unless ...