Questions tagged [grep]
grep is a command-line tool for searching text patterns in files.
0
votes
1answer
55 views
Linux Shell script - grep . filename
Can some explain the meaning of grep . filename, what does the . (dot) means here.?
Actually it removed all the empty lines in my file.
I just want to know how it's working.
2
votes
1answer
17 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 ...
1
vote
2answers
63 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 ...
0
votes
0answers
31 views
rsync + find & replace string on all incoming files
I am using rsync to sync my development server with my production server. To make things easier, how can I pipe all the files so that all instances of a string are replaced with another during the ...
0
votes
2answers
92 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 ...
0
votes
1answer
108 views
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 ...
0
votes
1answer
263 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 ...
-1
votes
1answer
29 views
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 - - ...
-2
votes
1answer
24 views
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 ...
1
vote
3answers
374 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 ...
0
votes
1answer
129 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 ...
1
vote
1answer
360 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=.*?...
6
votes
5answers
3k views
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/...
1
vote
1answer
331 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 ...
4
votes
2answers
368 views
How to show specific luns from lsscsi command?
I need to grep specific luns from the lsscsi command.
For example:
[root@e15l1 ~]# lsscsi 4 0 1 | awk '{print $1,$6}' | head
[4:0:1:0] -
[4:0:1:1] /dev/sdab
[4:0:1:2] /dev/sdj
[4:0:1:3] /dev/sdz
[4:...
3
votes
2answers
2k views
Ansible yum update then email me the results
Writing a playbook to perform yum updates and then get an email from each server. I'd like the email to contain the changed contents of yum.log.
IOW, I want the results of:
grep [today's date] /var/...
0
votes
1answer
240 views
Grepping a single line from iftop
iftop -t -L1 -s1
Output:
iftop -t -L1 -s1 | grep "Total send and receive rate:"
Output:
How can I grep just the "Total send and receive state:" line?
0
votes
1answer
255 views
Argument list too long with grep
Normally to search and replace a string in a selection of files, I would find with:
grep -rl 'pattern' .
This works fine unless you have a LOT of matches.
Anyway, I was looking around and found a ...
1
vote
0answers
151 views
Legal Discovery - how to search .eml files for keywords and copy the results to another folder on macOS/Unix?
I've got a Kerio Connect mail server that saves all of it's emails in a relatively standard mail spool folder structure as raw .eml files. I've been tasked with performing a keyword search against ...
0
votes
1answer
533 views
Trying to do grep and sed from a file and push the output into a variable
Can we do grep and sed from a file and push the output into a variable
grep "^/dev/disk/by-id/scsi-*" /tmp/disks.txt | sed '{'s/=.*//'}'
Output would be like this:
/dev/disk/by-id/scsi-...
-1
votes
1answer
406 views
Why grep doesn't work in the /usr/lib/systemd/system directory?
The other day I was on a RHEL7.1 system and I wanted to search for a specific word in the /usr/lib/systemd/system directory where all the systemd unit files are located.
I used the grep command as ...
-1
votes
1answer
79 views
how do i remove local ip from list of ip addresses?
I have a variable that contains list of ips and i will like to remove the ip of the instance where the variable is set
Please see below
[root@ip-10-10-2-100 ~]# INSTANCE_IP=$(curl -s http://169.254....
-2
votes
1answer
92 views
Listing all packages, but without addional text
In this time I am working of project, what tell you, what software you have installer and what you can install. In this time I have problem with this command: grep -hn Package: /var/lib/apt/lists/* . ...
3
votes
1answer
37 views
How to signal the presence of a pattern via exit code, without altering STDOUT
I need to run cmd1. If and only if PATTERN is missing from its STDOUT, i need to run cmd2 too:
cmd1 | grep "$PATTERN" || cmd2
But I'd like to see all output from cmd1, not just the lines that ...
0
votes
1answer
186 views
More elegant ps aux | grep [g]rep do not work
I am running the command: ps -ef | grep [p]ts/1
The result is:
root 13820 1733 0 14:19 ? 00:00:00 sshd: root@pts/1
root 13822 13820 0 14:19 pts/1 00:00:00 -bash
root 15847 ...
1
vote
0answers
291 views
Grep - Looking for non printable or higher range ascii characters
We faced an issue when someone copied a string from somewhere in one of the metadata xml files that contained ascii characters 239 (0xef), 191 (0xbf), 189 (0xbd)
We fixed the problem in known file, ...
2
votes
3answers
3k views
Cron: only send mail if output contains string
Can I make cause cron to only send the email if the output (stderr) contains a certain string?
I'm aware of this answer but the command I run doesn't distinguish between stdout/stderr, it always just ...
1
vote
1answer
4k views
Escaping special characters in grep regex
I am trying to run a grep regular expression on a file, where I have to exclude lines where "00" and "0" appear. I came up with this expression:
grep -a -E \"stored\"\:\ \"\*123\*(?!00)[0-9]{2,5}\#\" ...
34
votes
3answers
8k views
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?
1
vote
0answers
54 views
Grep error or limitation reached on 1.2GB text file?
grep on large file followed by tail produces incorrect result, see proof below. The file is 1.2GB large, but grep should process it as a stream, so where could be a problem?
root@condor1796 /home/...
7
votes
2answers
2k views
How to programatically add secure_path in sudoers file
I'm trying to build a user data script for an EC2 instance that builds node and npm from github, and then starts a service. To grease these wheels, I need to add:
:/usr/local/bin
to the end of the ...
-2
votes
1answer
87 views
How to turn this into an alias?
I frequently use this command:
grep -rnw donkey | grep market | cut -c -80
How can I change it into an alias on Linux?
I tried:
alias search='grep -rnw $1 | grep $2 | cut -c -200'
But when I run ...
5
votes
1answer
3k views
Grep Not Working (on some files)?
I have a MSSQL database dump I'm trying to grep through. However, grep does not seem to work on it, at all. Here is a snippet of the file.
...
ALTER DATABASE [Documents] SET RECURSIVE_TRIGGERS ...
-5
votes
3answers
355 views
Search for a word before white-space
I've got a file with some e-mails:
info@example.com info51351@hotmail.com
test@hello.com test6261@gmail.com
example@example.com example64262@gmail.com
And now... I need to find a way to search for ...
3
votes
3answers
559 views
Grep regex Stdout to telnet
I'm trying to use grep to get a regex result and pipe the results on-the-fly to telnet running an open port to a node server.
The grep received continuous, but varied in interval, commands from a ...
2
votes
2answers
2k views
Pipe grep result to awk with “: ” as field separator
I would like to filter the result of a grep command, eg :
myRepo/path/to/my/file.php:123: error_log(' - myError');
If I do the following, it works.
echo " myRepo/...
3
votes
2answers
1k views
cygwin grep running 680 times faster via ssh than via remote desktop
Running grep by opening Cygwin terminal via Microsoft Remote Desktop to Windows Server 1012 R2(same as natively?):
Administrator@MYSERV /cygdrive/d/bin/beta
$ time grep -inowf ...
0
votes
1answer
85 views
Can I filter output from `tail` with the `-f` flag?
I'd like to tail -f the output of access_log on RHEL 6.8 but pipe and grep that output to act as a filter. Is there such an option?
That is I'd like live output from:
# tail -f error_log | grep <...
0
votes
1answer
25 views
how to compare and move the matched string files in different locations
I have a two different .zip files in /tmp/1/ and /tmp/2
I want to compare these two different location files and move the matched string files into /tmp/3
/tmp/1
ArchiveFile_aaa.zip
ArchiveFile_bbb....
1
vote
1answer
118 views
How to write a shell script to search from a position in file instead to start from beginning of the file again
I am trying to write a shell script to find value stored after a repetitive word in a big file with millions of lines using for loop. After the finding the repetitive word how i make script to start ...
1
vote
1answer
144 views
grep command to extract data from a file
I have a file that has this line in it:
$n22(s:Tstring) = "252";
I'm trying to write a shell command to grep the file and only return 252.
This is what I have so far:
grep -o '$n22(s:Tstring).*...
7
votes
2answers
1k views
Cat, Grep, Redirect Output… Blank File?
I just ran
cat /opt/webapplications/Word/readme.log | grep -v 'Apple'
and I got the output on the cli that I was expecting, which was all the lines in readme.log that did not contain 'Apple'...
...
0
votes
2answers
2k views
How to kill/close log files that are open through lsof grep deleted?
I have a deleted a large log file from our servers. so I executed this command to validate.
lsof -nP | grep '(deleted)'
and this showed up.
how can I permanently delete the results fo this lsof? I ...
1
vote
1answer
241 views
Search lighttpd access log
The access-log on my lighttpd server is kind of huge, apx 5GB.
Now I need to extract all data from a given date, 12th of February, from the log file and if possible save to new file. Is it possible ...
0
votes
2answers
231 views
Using GREP to Find Text in Files
I'm trying to use grep to find a specific line of PHP code I know for certain is present in several files, but all I get back is an empty result. Please advise on how I need to modify my grep query:
...
2
votes
2answers
2k views
Update grep on Ubuntu through apt
Say, I currently have grep version 2.2 on my system and I would like to upgrade to version >= 2.5.
Other than installing grep through source code, is there a method to update grep using Ubuntu (apt) ...
0
votes
1answer
49 views
grep the result of cdrecord or wodim
I would like to parse the result/progress of a running cdrecord -v burn process. What I tried so far was cdrecord -v dev=/dev/sr0 -data foo.iso 2>&1 | grep -E 'Track [0-9]+:.*written'.
...
-1
votes
2answers
832 views
Find all files which contain pattern in directory of tar files
I have all tar files in a directory. I want to find some files in tar files without extract all tar files.
I know how to work with one tar file:
tar tvf abc.tar | grep xyz
I want to find in all tar ...
-2
votes
1answer
297 views
Grep is not working without having read permissions [closed]
I am in a folder where I do not have read permission in contents.
ls -l
List all files sucessfully.
I want to count files that have some attributes in their name with:
ls -l | grep file????.tar.gz ...
0
votes
1answer
532 views
delete a line if it contain a particular match from a file in bash
I have a file contain lines like the following.
10 TEST NO SOMETHING
20 TEST YES SOMETHING
101 TEST YES SOMETHING
100 TEST NO SOMETHING
How can I delete only the line that has ...
