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Questions tagged [grep]

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

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Search a pattern word from multiple files and concatenate whole lines in a new file

I have several data files. For example sales.txt (the original file has 13 columns) Date Unit $$ employee# abc def jkl mno pqr Dec1 10 500 2 1 2 3 4 5 Dec2 12 450 3 6 7 8 9 10 Dec3 13 550 3 11 12 13 ...
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Using systemd-run To Limit I/O on cPanel for Grep Command

When I run the grep command on Linux on my cPanel-based shared hosting account, I hit an I/O resource limit, it says on the cPanel. I tried to research how to limit resources on a command that I run ...
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Replace a string from the cat output

I need to replace a string with the string which is mentioned in a file abcd.txt in all files in a folder. For eg: I want to replace a string 'apple' with whatever the cat output of this file abcd.txt ...
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Filter the output of locate not to show the Duplicates in rsnapshot

When I use locate on my server and the result is in my rsnapshot backup then I get all those duplicates. I could use grep to filter out all rsnapshot files: locate something_in_backup | grep -v /var/...
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5 votes
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Best way to remove text from the beginning of a huge file

I have a huge MySQL backup file (from mysqldump) with the tables in alphabetical order. My restore failed and I want to pick up where I left off with the next table in the backup file. (I have ...
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1 answer
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How can I highlight lines of a file that begin with abc and DO NOT end with xyz?

I have a daily script that retrieves hardware stats from all of my RHEL servers every night and saves them to a yyyymmdd_daily.log file. I have other scripts that I run against these files to extract ...
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2 answers
68 views

Zip all files returned from "grep-ril" command

I'm using grep -ril to be able to see all files that contain a certain string: [user@machine]$ grep -ril "test string" file1.log file2.log file3.log file4.log ... I then would like to zip ...
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How to do sudo grep in a bash script?

I would like to check if the given ip address is already in the config file. But /etc/ can only be accessed by root, and I'm running the a script as admin. It seems I can't just do sudo #!/bin/bash ...
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I want to exclude specific words from the results when piping tail into grep

I am using "tail -f /var/log/fail2ban.log -f /var/log/ufw.log | grep -e Ban -e BLOCK -e ALLOW" (without the quotes) and it is working but I want to exclude the results that have the words ...
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Regex does not work with grep

Why does this match .*\/.+\/wp-admin.*404 [03/Sep/2021:18:58:29 +0200] "GET /up/wp-admin/install.php HTTP/1.1" 404 6197 regexr.com But in grep it does not? sudo grep -rh ".*\/.+\/wp-...
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Linux cli pipeline command tail and grep

I am using tail to monitor a log file and using grep to filer the keyword. tail -F somefile.log | grep "keyword" is working tail -F somefile.log | awk '{print $4}' is working but if to put ...
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1 answer
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How get info into variables from command output

I am run nginx -V and get like this: nginx version: nginx/1.18.0 built by gcc 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04) built with OpenSSL 1.1.1f 31 Mar 2020 TLS SNI support enabled configure arguments: --...
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"grep" a group of lines

I am reviewing my mail traffic looking for large messages and sending these "finds" to the staff for removal or approval. Each message has four SMTP lines and I want extract just these ...
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2 votes
1 answer
316 views

Extract a ids from text file

I have a text file live below { "data": { "assigned-entity-id": null, "assigned-entity-type": null, "availability-domain": null, "...
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2 answers
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GREP multiple lines that are not next to each other

I have a text file that looks like this: landlord: John Smith has: house: 0 flat: 5 available: 1 cheap: 0 quality: 1 landlord: Will Hall has: house: 3 flat: 4 available: 1 ...
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1 vote
1 answer
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Format export using grep and awk

I would like to export data from zimbra server, but it's export data in every new lines, my command: zmprov -l gaa -v domain.com | grep -e "zimbraForeignPrincipal: " -e "...
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Find all words after specific string

So, here's the thing. I have a file contains like this: LOG=123 HEY=BRO FOO=BAR LOG=124 I need the value of LOG= and an output like this: 123 124 I already tried using this command: echo "$LOG&...
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Linux Bash Scripting using grep sed and cut command to display ip address with port number

Can any one please help me I need a output of "192.168.1.1#53" by using these 'grep' 'sed' and 'cut' command mandatory in linux bash scipting in given below text. ;; Query time: 29 msec ;; ...
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1 answer
107 views

how to avoid grep output empty file

Using grep to print a keyword in a log to the output file grep -i -n "application" /app/log1.log > L1.log Now this gives results if it finds application in the log. But also results empty ...
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1 answer
2k views

How to grep (Select-String) the output of curl (Invoke-WebRequest) in PowerShell

I'm trying to curl a website and grep it for a specific line in PowerShell. How can I do that? Here's the equivalent of what I'm trying to do, but in BASH user@host:~$ curl -s www.isxkcdshittytoday....
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Summarize first column same field

I have some datas with URL's and used network data. I made a custom file with these data's and i stuck last one step. What i have now: sevroland.api.url.com 488 www.logstach.url.com 42725 ...
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1 answer
254 views

How to change one line of code in a block of code from linux command line?

I have a change I need to make across multiple different sites and may need to make again in the future, so I'd like to put it in a shell script. Essentially I want to find a specific class block in a ...
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1 vote
1 answer
918 views

CentOS command not found

When I login to my CentOS 7 Server I get a couple of errors. Similar command is: 'tty' bash: ls: command not found... Similar command is: 'lz' /usr/libexec/grepconf.sh: line 5: grep: command not found ...
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1 answer
102 views

How to tail server.log and grep multiple text combination? [closed]

The server log is too large, I would like to grep the logs which has "/API/login" and "/API/init" from the server log. I'm able to use: tail -f /server.log | grep -i "/API/...
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2 answers
613 views

Grep messages like trash - No such file or directory

my server was hacked, and I am now trying to locate all the "strange" files. I am running: find . -type f -name '*' | xargs grep -l "Mini Shell" This command is helping me a lot ...
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1 vote
1 answer
804 views

Scan IP range for SSL/TLS versions and vulnerabilities with legible/greppable output

I'm looking to find computers on the network that are using older versions of tls/ssl. So far I've been using nmap's ssl-enum-ciphers and ssl-poodle scripts but the output isn't helpful as it shows ...
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1 vote
1 answer
267 views

Append to crontab only if entry does not exist

I am looking for a programmatic way to append to crontab only if the entry does not exist. Also, the exit code must be 0 for both cases where the entry does not exist, or the entry exists. I tried: (...
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1 answer
737 views

netstat how to exclude localhost from the result when using grep

When I run this command in my terminal: netstat -an | egrep ":80|:443" | sort I got this following output: tcp 0 0 172.104.10.125:48310 172.104.10.125:8081 TIME_WAIT tcp ...
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  • 137
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1 answer
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How to grep lines only with matched words in Linux [closed]

I have a little question. I have a list of processes. After this command ps aux | grep postgres I see postgres 1178 0.0 0.2 320064 27060 ? S Apr12 0:05 /usr/lib/postgresql/10/bin/...
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3 answers
253 views

How to remove old kernel on Ubuntu operating system

I am wondering how can I do remove old kernel from Ubuntu operating system. Please refer image screenshot taken. Please advice. Many thanks. list of linux kernel
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1 vote
1 answer
49 views

How to quickly check if specific keywords exist in a lot of log files in shell?

I have run a program that writes a lot of log files in a lot of directories. For example, there are hundreds directories, and every one includes thousands of log files. I need to find out the files ...
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  • 137
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1 answer
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check ip is present and update iptables openvpn

I want to check that the ip is present within the ccd folder and push the ip route to the FORWARDING chain in the iptables. Im new to bash scripting and need a little help finishing this script. ...
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2 answers
109 views

Extract string from column with grep

I have a column based .txt file and I want to grep output the Common Name, having a little trouble. V 300223164711Z 01 unknown /C=UK/O=LMG/OU=server/CN=server/name=server/emailAddress=...
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1 answer
76 views

Script to grep large file [closed]

I have a file that has about 63000 row I need to grep though [root@server]# cat missinglinks.txt 69870 1.pdf.Published 125098 2.png.Published 125022 3.pdf.Published 69867 4.png.Published I have a ...
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1 answer
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How to print only Users list and Access level from /etc/sudoers?

We have multiple servers and i would like to print users list and access level using bash. I tried below command but could not get exact result what i wanted to: awk '/Allow root/{p=5} p > 0 {...
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2 answers
62 views

How to filler out iptable result base on certain fields and view it with tail command?

I have this log : Jan 26 01:05:47 server54 kernel: [41s58.6w4335] INPUT:DROP: IN=eth4 OUT= MAC=d3:ss:43:23:23:43 SRC=1.1.1.1 DST=127.0.0.0 LEN=40 TOS=0x00 PREC=0x00 TTL=254 ID=65259 PROTO=TCP SPT=...
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0 answers
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Creating a script for Kickstarting servers; issue with created softraid 1 server based on CentOS 7

First off; I am sorry if my title is incorrect, but I didn't want to "clutter" it too much. I am creating a bash script which is used to install various servers based on CentOS 6 and CentOS 7 with ...
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1 vote
1 answer
1k views

From a string, formatted as a table with spaces, how to grep all values that are equal for all columns?

The question comes from the issue: https://github.com/kubernetes/kubectl/issues/717 Kubectl returns information in a table like this: $ kubectl get replicasets -n kube-system NAMESPACE NAME ...
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1 answer
101 views

Filter ss process output without using grep

ss -p can give the process name, process id (PID) and the file descriptor associated with the connection. Example: ss -tuanp [...] tcp ESTAB 0 0 x.x.x.x:59594 x.x.x.x:993 users:(("...
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  • 285
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1 answer
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Not logic in docker filter

I have a named container that may or may not be up and if it is up I want to be able to kill all the containers but that one by name. Basically what I want is: docker kill $(docker ps -aq --filter="...
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2 answers
237 views

Parse Date from Text String in a 3 column format

I am given an array of lines from a text file. They look similar to this, and will always be structured like this: Full Tue Aug 27 10:59:43 2019 1 ...
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0 answers
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Why is sudo password entering lost

When I use sudo command and pipe it to another command, e.g. sudo dnf search foo | grep bar there is a prompt requiring to enter the password. Following this answer, sudo directly accesses the ...
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0 votes
1 answer
307 views

grep for an array entry in a file

so I have a file step1 containing data like field [T]:0.000 heatstart [s]: 1.50E+1 a[a],b[b],[c[c],d 1.02E-1,2.31E-1,... 1.50E+1,4.26E-1,... ... and a file called var4 containing only the entry 1....
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0 votes
1 answer
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How to create an alias that uses a value and grep on a remote server?

I need help, I can't create an alias with a variable to grep a file on a remote server. I have tried: alias searchword="ssh -t user@server "grep -i \"$1\" /root/file.txt\"" alias search="ssh -t ...
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  • 3
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2 answers
511 views

grep exclude multiline pattern

Searching for multiline patterns in files with grep is trivial. Inverting that pattern not so much. Background: I want to create clean variable files without passwords so I can commit them into a ...
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0 votes
1 answer
884 views

How do I grep last match in a range of files?

I have files named memOutput.X where X ranges from 0 to 47 in a directory. I want to see the line with the last occurrence of VmData in all these files. I can run grep VmData memOutput.0 | tail -1 ...
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  • 103
1 vote
3 answers
58 views

text processing linux using grep awk or anything else

I want to replace in this string Wed Apr 10 06:44:10 UTC 2019 all whitespaces with comma and along with that trim off UTC part. What I have tried : var1="Wed Apr 10 06:44:10 UTC 2019" echo ${var// /,...
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  • 172
0 votes
1 answer
87 views

get a specific line from in linux using grep

Hello I am new to linux and grep and awk commands. I am trying to get the number value from this string variable and then store it in another variable. var1="Version must be incremented on update. ...
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  • 172
2 votes
1 answer
155 views

Cygwin 2.9.0 cat/tac Commands Fail on Large Files when Piping to grep -q -m1

I am seeing some odd behavior using Cygwin x64 2.9.0 on Windows 10 Pro x64. The command I am attempting to run is the following: tac <file> | grep -q -m1 -F "literal string" The above command ...
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1 vote
2 answers
952 views

Send email if script outputs string

I found this line: sh script.sh | grep 'NO' 2>&1 > grep.log && /usr/bin/mail -s "grep found something" m@mail.com < grep.log which will write the output of script.sh to grep.log ...
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