Questions tagged [grep]
grep is a command-line tool for searching text patterns in files.
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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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1
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1
answer
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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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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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1
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65
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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 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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1
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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
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743
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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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181
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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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13
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8
answers
38k
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How do i get the default gateway in LINUX given the destination?
I'm trying to get the default gateway, using the destination 0.0.0.0
i used this command: netstat -rn | grep 0.0.0.0
and it returns this list:
Destination - Gateway - Genmask - Flags - ...
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2
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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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4
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Using grep -Po to extract regex
I've been struggling with "grep -Po" off and on for a couple hours.
What I would like to do is to find out how many bytes the virtual disk size is as reported by qemu-img info.
Here's example output:...
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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
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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
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454
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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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How i can dump raw packets from an existing tcp socket using tcpdump on Mac and Linux? [closed]
Once I know the IP address and port number combo, I can run this to see some of the packets:
tcpdump | grep [IPADDRESS]
Anybody know how I can now see the raw packets too?
Thanks!
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4
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grep ouput filepath with file modified date?
Is it possible to make the grep command to output file paths with file modified date like so:
12-02-2015 /file/path/to/the/file
16-02-2015 /file/path/to/the/file
25-02-2015 /file/path/to/the/file
03-...
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2
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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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7
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How to Find a file in FreeBSD
I'm trying to locate all copies of example.filename on my FreeBSD server. What's the best / easiest / most efficient way to do this?
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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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523
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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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1
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342
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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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indexing logs for fast repeated grep/search
I have sets of verbose logfiles that in the course of solving a problem, I will repeatedly regrep.
I usually have about 1-10GB sets of 50-150 files, that I'll spend a few hours with and then never ...
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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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1
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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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How can I use grep to find the most frequently recurring errors in my log file?
I've got a PHP application that is generating large amounts of warnings and notices in the log file..
I'm fixing these one at a time.
I would like to be able to fix the most frequently occurring ...
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3
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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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1
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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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47
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7
answers
48k
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Recursive text search with grep and file patterns
Given this example folder structure:
/folder1/file1.txt
/folder1/file2.djd
/folder2/file3.txt
/folder2/file2.fha
How do I do a recursive text search on all *.txt files with grep from "/"?
("grep -...
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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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2
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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" [email protected] < grep.log
which will write the output of script.sh to grep.log ...
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2
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How can I remove malware code in multiple files with sed?
I've this malware code in so many .html and .php files on the server. I need to remove them using
sed -i expression
search all files under directory /home/
find infected files
remove the code by ...
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2
answers
276
views
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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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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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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1
answer
145
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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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3
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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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13
votes
3
answers
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How can i send /var/mail/root again?
Through some misconfiguration I've a lot of emails in /var/mail/root and /var/mail/www-data
How can I "loop" over these files and send each mail another time?
3
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3
answers
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ps ax | grep java with no wrapping in the terminal?
Is there a way to execute ps ax | grep java without it wrapping on the terminal?
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List top 404 URLs in Apache access_log [closed]
I'm looking for a command to list the 10 or 20 top 404 error URLs out of my apache access_log. Can anyone help me with this?
thanks
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5
answers
314k
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How do I grep through binary files that look like text?
I have binary files that should be text (they're exported logs), but I can't open it with less (it looks ugly - it looks like a binary file). I found that I could open it with vi and I can cat it (you'...
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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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35
votes
3
answers
14k
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Grep in a huge log file (>14 GB) only the last x GB?
I need to search something in a huge log-file (over 14 GB). I'm pretty sure it's in the last 4 GB or so.
Is there a way to skip the first X GB to speed things up?
CommunityBot
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1
answer
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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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6
answers
8k
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"watching" a log on FreeBSD vs Linux
On Linux systems I can
watch -n1 tail /var/log/whatever.log
or
watch -n1 grep somestuff /var/log/whatever.log
To show updates to a log every 1 seconds.
On FreeBSD however, the watch command does ...
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votes
5
answers
8k
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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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3
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How can I count the number of lines matching a pattern returned from a linux command
How can I count the number of lines matching a pattern returned from a linux command
I want the number of lines returned beginning with 'foo' , so if I pipe the output to grep will this ...
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809
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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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