Tag: grep

Regular expression operator {} in linux bash

I’m having some problems with the {} operator. In the following examples, I’m trying to find the rows with 1, 2, and 2 or more occurrences of the word mint, but I get a response only if I search for 1 occurrence of mint, even though there are more than 1 per row. The input I am processing is a

reading and analyzing a text file with bash script

bash echo grep linux regex

I want to read a log file and want to extract 5-6 number digit that is written right next after the keyword “salary”. And then want to analyze if the salary is above 2000. If there is even one above 2000, it is a MNC otherwise unknown. After writing the salary, the line ends mostly but sometimes t…

How to replace newlines between brackets

awk grep linux logfile sed

I have log file similar to this format Here is the echo command to produce that output $ echo -e “test {nseq-cont {nttt0,nttt67,nttt266nttt},nttgrp-id 505nt}n}ntest{nttest1{nttvalnt}n}n” Question is how to remove all whitespace between seq-cont { and the next } that may be multiple in the file. I …

Filtering on a condition using the column names and not numbers

awk bioinformatics grep linux terminal

I am trying to filter a text file with columns based on two conditions. Due to the size of the file, I cannot use the column numbers (as there are thousands and are unnumbered) but need to use the column names. I have searched and tried to come up with multiple ways to do this but nothing is returned to

Filter followed tail to file using grep and redirect

grep linux redirect stdout tail

I want to get the output of tail -f /var/log/apache2/error.log | grep “trace1” into a file. But tail -f /var/log/apache2/error.log | grep “trace1” > output.txt does not work, while the first command gives an output in my terminal window as expected. I guess it has to do with the fol…

not sure what’s the problem with this “regex” in the “grep” shell command

bash grep linux regex shell

This was my attempt: I’m on hackerRank. I have this file that is delivered to my stdin. I need as a result lines that contains : Answer In a POSIX BRE pattern, when you use a “shorthand character class” like s, w, even in GNU grep, these escape sequences are treated as separate chars, a back…

linux replace string in files recursively

grep linux replace sed string

I have a folder which is full of *.java files. it has the following method in it: i wanted to change this as following: I have searched in the forum and found some solutions, replce string is what i wanted so tried the following: But it throwing me the following error: I guess the old_string and new_string fo…

using only ‘grep’ command to get specific column

cat csv grep linux unix

This below shows this some lines of csv file, i want to get the results that only get the Population column with only using grep command. results i want: The command i made for this problem was which got results below how can i get rid of the rest of things without using awk sed or any other things? Answer

Replacing line of text cointing using sed

command-line grep linux sed

I’m trying to replace document.querySelector(‘.popup’).classList.add(‘active’) by document.querySelector(‘.popup’).classList.add(‘noactive’) Answer You can use See the online demo. The regex is POSIX BRE compliant and matches (document.querySelector(&#8216…

To read desired values from file using linux system commands (grep,awk,sed) [closed]

awk command-line grep linux sed

Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 1 year ago. Improve this question I have file test.txt contains some variables assigned to some value, i need…