Questions tagged [grep]

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

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30 views

“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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1answer
189 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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which are the ways to find new files in a server location

I'm trying to find new file(s) created , copied, moved or modified in latest hour in a linux server location /home/user/ and I would know if the following command is the best way which covers all ...
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2answers
120 views

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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1answer
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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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1answer
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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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grep -e and find is changing last modified time of files

I was using grep -rn '.' -e 'pattern' to search for the occurrence of the given pattern and after I used find . -type f -exec sed -i 's/OLD_PATTERERN/NEW_PATTERN/g' {} \; to find and replace a ...
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1answer
877 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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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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1answer
322 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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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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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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1answer
422 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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1answer
104 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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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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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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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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1answer
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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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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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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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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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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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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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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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598 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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1answer
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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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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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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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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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1answer
226 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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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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2answers
321 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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1answer
424 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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3answers
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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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1answer
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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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1answer
113 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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2answers
668 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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Any way to avoid using `grep -v`

When performing a grep filtering across pipes, as in the following example, $ ps -ef | grep 24604 username 18660 24604 0 16:38 pts/3 00:00:00 ps -ef username 18661 24604 0 16:38 pts/3 ...
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1answer
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Grep returns nothing

This is the grep command I used grep -ic address log* The output is 0. I know for a fact that there are more than 60 occurrences of the word address in the log file. But I still get 0. Now, I ...
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1answer
2k views

How can I use an iperf output and only grep Interval and Bandwidth?

I am trying to get the output from the command iperf -c 10.0.0.1 -t 3600 -i 2 And only need the Interval and bandwidth fields listed for the entire hour of logging. I haven't used grep or awk in ...
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1answer
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Apache Logs - identify IP that made series of specific requests

Given the following apache access log: 127.0.0.1 - - [04/May/2018:11:19:03 +0300] "GET /file1 HTTP/1.1" 200 ... 127.0.0.1 - - [04/May/2018:11:19:03 +0300] "GET /file1 HTTP/1.1" 200 ... 127.1.1.1 - - ...
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1answer
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finding a string among several zipped files (webapps)

We have to find a string, let's say "foobar" among several webapps. However, some webapps contain zipped files, eg log4j.jar. Therefore, grep -IR "foobar" /pathto/tomcatroot/ won't work, because of ...
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3answers
1k views

Grep last match from file

I'm running the following command against a log file and only wanting to get the last/latest match. Sometimes there may only be one match, other times there may be multiple, which is causing an issue ...
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1answer
394 views

grep multiple occurrences with intervening lines

I'd like to do the following: Given a file with many lines, several of which match a pattern, output the first matching line, the last matching line, and all the lines in between (I want them in ...
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1answer
682 views

Grep --only-match without new line

I want to use grep command to extract some strings from my data file. data file format a=1,b=2,c=3, a=4,b=5,c=6, I want the out format a=1,c=3, a=4,c=6, I tried the below command grep -Po 'a=.*?...
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Calculate sum of several sizes of files in Bash

I have list of files in a file, cache_temp. In file cache_temp: /home/maildir/mydomain.com/een/new/1491397868.M395935P76076.nm1.mydomain.com,S=1740,W=1777 /home/maildir/mydomain.com/een/new/...
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1answer
609 views

grep does not work in particular folder on centos?

It's a bit strange with the grep command. When I am in the mail folder, it always produces help text. At first, I thought I had wrong synxtax but it is working on its parent folder. What could be the ...

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