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Questions tagged [grep]

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

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Copy/Move Entire Line To End Of The Line Above

I have a file that looks like the following: /path/to/a/very/long/path 0 0 0 0 0 0 I need to move the line starting with a number (this can be any value not necessarily 0) to the end of the ...
djc72uk's user avatar
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1 vote
1 answer
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why "grep -v" or "tail -f" stop my program's output?

I have a server for Euro Truck Simulator 2 which is called by the following command: LD_LIBRARY_PATH='$ORIGIN/../../linux64' eurotrucks2_server When the server is running, sometimes I get these lines ...
roughnecks's user avatar
1 vote
1 answer
185 views

how to exclude folders by date with find?

This is "myfolder": tree -a 'myfolder' myfolder ├── 20220902 │   ├── filefoo │   └── filebar ├── 20221001 │   ├── filefoo │   └── filebar └── 20221015 ├── filefoo ├── filebar └── ...
acgbox's user avatar
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1 vote
1 answer
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how to extract values from files, compare it with a variable and send to out file

I have myfolder with this files: ls myfolder filefoo filebar filefoobar For example, the content of filefoo is: total: 379400041 cache_object://localhost/active_requests 379400041 6778 0-...
acgbox's user avatar
  • 366
0 votes
1 answer
370 views

how can I extract a Version number from a website with curl and grep / sed?

I want to get the latets version number from this website: https://www.mailpiler.org/wiki/download so I do a curl to get the content and then just use a pipe to search for the string using grep curl ...
helpmenicely's user avatar
0 votes
1 answer
945 views

Pipe into command stored in bash variable

I enter two command in bash: $export g='grep "something"' $echo "something and another thing" | $g But it doesn't work. I want the second command to be evaluated by bash as : ...
rooni's user avatar
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0 answers
35 views

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 ...
ServerChecker's user avatar
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0 answers
723 views

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 ...
Am3Y's user avatar
  • 67
1 vote
1 answer
20 views

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/...
rubo77's user avatar
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5 votes
3 answers
827 views

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 ...
Christopher Schultz's user avatar
0 votes
1 answer
27 views

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 ...
PCnetMD's user avatar
1 vote
2 answers
201 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 ...
Ress's user avatar
  • 45
1 vote
0 answers
74 views

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 ...
Houman's user avatar
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0 votes
2 answers
319 views

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 ...
Greg Azar's user avatar
0 votes
1 answer
150 views

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-...
lampstackxyz's user avatar
0 votes
1 answer
54 views

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 ...
olo's user avatar
  • 103
1 vote
1 answer
126 views

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: --...
Petro's user avatar
  • 11
2 votes
1 answer
481 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, "...
Am3Y's user avatar
  • 67
1 vote
2 answers
273 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 ...
John Smith's user avatar
1 vote
1 answer
125 views

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 "...
zuku's user avatar
  • 41
0 votes
1 answer
41 views

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&...
Azikun's user avatar
  • 3
-2 votes
2 answers
730 views

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 ;; ...
hemanth singamala's user avatar
0 votes
1 answer
586 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 ...
chandu rajpurohit's user avatar
0 votes
1 answer
4k 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....
Michael Altfield's user avatar
0 votes
0 answers
27 views

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 ...
TDex's user avatar
  • 1
0 votes
1 answer
367 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 ...
TBridges42's user avatar
2 votes
1 answer
2k 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 ...
Jonas Heinze's user avatar
0 votes
1 answer
527 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/...
Tech's user avatar
  • 3
0 votes
2 answers
869 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 ...
Pikk's user avatar
  • 339
1 vote
1 answer
1k 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 ...
rambetherleu's user avatar
1 vote
1 answer
536 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: (...
Justin's user avatar
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0 votes
1 answer
1k 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 ...
Kalib Zen's user avatar
  • 137
0 votes
1 answer
37 views

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/...
Piduna's user avatar
  • 531
0 votes
3 answers
290 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
Fairuz Adli's user avatar
1 vote
1 answer
156 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 ...
Leon's user avatar
  • 169
0 votes
1 answer
122 views

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. ...
Kam-ALIEN's user avatar
0 votes
2 answers
518 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=...
Kam-ALIEN's user avatar
0 votes
1 answer
167 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 ...
Andrew Sitterly's user avatar
0 votes
1 answer
122 views

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 {...
Santosh Garole's user avatar
0 votes
2 answers
81 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=...
malloc's user avatar
  • 103
0 votes
0 answers
41 views

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 ...
HudsonHawk's user avatar
1 vote
1 answer
2k 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 ...
kivagant's user avatar
  • 113
0 votes
1 answer
239 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:(("...
wget's user avatar
  • 291
0 votes
1 answer
2k views

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="...
Itay Weiss's user avatar
0 votes
2 answers
433 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 ...
Kevin's user avatar
  • 133
1 vote
0 answers
42 views

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 ...
Ta Thanh Dinh's user avatar
0 votes
1 answer
396 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....
nobody's user avatar
  • 1
0 votes
1 answer
199 views

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 ...
xxmlud's user avatar
  • 3
0 votes
2 answers
684 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 ...
Gerald Schneider's user avatar
0 votes
1 answer
2k 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 ...
nac001's user avatar
  • 103

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