Questions tagged [grep]
For questions pertaining to grep, a command-line tool for searching text patterns in files. Use this tag for questions about grep itself or questions about issues arising from using the grep command-line tool.
4,978
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Recursive pattern search - output formating: for each match file print out the specific file name "\n", line number, sentence matched "\n" in colors
I want a file content search command, under Linux so that:
it will search on specified files, e.g: md, txt, htm.
recursively from the folder and its subfolders, e.g: .
the content search can be ...
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51
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grep for contents AFTER pattern in delimiter (serial number)
Say I have a file
#cat serial
SerialNumber : G5DBSTLAJ104949
I only want to know what words in print $3 appear after "SerialNumber" ,
I would much prefer that the output of ...
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0
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I need to sort files in recursive list, but there are some difficulties [closed]
I got some problems when I was doing the task:
Output the first four elements of a recursive list of file names and attributes in the lib0 directory containing the string "ra", sort the ...
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4
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615
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Can I extract complete dates from file with grep command?
I need help using grep to extract a zoned date time from a file on a Linux system.
Source file is a XML with the data below:
<item start="20231010073000 +0100" stop="20231010100000 +...
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50
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Search for a string at proximity with another string?
Say I want to search for '123456789' and I want it to be near 'firstname'. Is there a way to do it?
I've 0 logic to do this. Maybe piping greps could work?
What kind of algorithm is best suited for ...
- 434
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74
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Using grep with ps and column width specification
I'm trying to limit the column width of the command column when running a ps command, but also trying to pipe that output into a grep command. However, this is not working.
This runs fine:
ps -eo pid,...
- 103
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20
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Using find in order to detect a magento module
At magento routes are located in adminhtml/routes.xml each module has a folder named adminhtml with a file routes.xml each module has its own folder. In other words I have the following file structure:...
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Counting characters between grep searches
Is there a way I can use the grep command in conjunction with a series of other commands to find a character sequence (ie 'GAATTC' in a fasta file) and count how many characters are between each match?...
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replace both filename and filename's content relying solely on pattern found on the name-of-the-file
I'd like to know if it's possible to replace both filename.ext and a matched pattern inside its content regarding a pattern founded on the filename itself using sed (and grep also, maybe?).
Let me ...
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82
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How to recreate grep -f with awk
I have a large file with lots of unnecesarry info. I am only interested in section between edit and next and handle them as one entry. I manage to filter it down like this....
'
awk 'BEGIN {FS = &...
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67
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How to remove empty lines containing only ends of lines $?
I have a file:
cat -E extracted_numbers.txt
11.47$
0.32$
$
1.37192$
-4.$
7.$
20.$
13.$
$0.
15000$
15000.$
$
2.87$
$.6
47.$
$00.
0.0000000000000000$
0.0000000000000000$
$
0.0000000000000000$
0....
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32
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How to grep logs with line break
I have a log file with the following structure, some logs will contain line breaks like [query-id=123]
[query-id=123] contentA:
1. content
2. content
3. content
[query-id=124] contentC
[query-id=...
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1
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129
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Getting a short string from a long one without spaces
I have a file with a huge string without spaces in it (something like: "A":123,"B":456,"C":789...)
I want to get X amount of chars before and after a specific value (like ...
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A shorter way to list all packages matching a string
When I search for a list of packages, I usually use
dpkg -l|grep string|cut -d" " -f3|xargs
libdouble-conversion3:amd64 libestr0:amd64 libeval-closure-perl
libio-stringy-perl libunistring2:...
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Which portion of boot.log files are binary?
My system keeps seemingly randomly failing to boot after a kernel update. So I am reading logs to try to determine the cause of the issue. Here is one of the boot logs:
$ sudo cat /var/log/boot.log.1
-...
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99
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How to view a log file that's worth 10GB+?
The ways that I've thought of:
If you get to reproduce the scenario in real time. Use
tail -f application.log | tee /tmp/tailed_log
But it's not sure that we'll get to reproduce the scenario in real ...
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3
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90
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Deleting files whose filenames match strings contained in a file
There is a text file, del.txt, containing a list of randomly-generated identifying strings, for example:
07ckv978yk0
HuinLBoZHcY
_oR7ccXiunY
I would like to delete any files whose filenames contain ...
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5
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How can you, with bash, check all files in a directory to see which ones (if any) something was written to?
I ran a script which acts on multiple "people", and creates output and error files for each. let's say something like this:
output_alice.txt
error_alice.txt
output_bob.txt
error_bob.txt
.
.
....
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Regular expression to search contents that contain qr in it?
grep -rlw . -e '%QR%'
I am doing something like this. Anything could be before QR and anything could be after QR. It could be nothing as well.
I am searching for file names containing QR inside in ...
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324
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Grep Multiple Pattern located in different lines and print in the same line
I'm trying to find a way to grep information in the file that located in the different lines and one of the pattern is contain pattern of date and time.
below is the input
unwantedtext unwantedtext ...
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How to check logs greater than certain duration using grep?
grep -lw -e '0123456789' application.log_2023-07-*
I want logs greater than 2023-07-*, how do I achieve it?
Similar Question:
grep particular log entry greater than specific time
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106
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How to grep for the value of a variable inside a shell script?
I have 2 files:
a file full of values I want to look for
my source text file
I wrote a short shell command to loop thru my list of values and grep against my source file. If it doesn't find the ...
- 483
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4
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64
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Find strings with several exclude-constraints on the beginning of the line
If I want to find all the "double-quoted" strings in files, I would use:
grep -rnw . -e "\".*\""
but I want to exclude all the lines that begin with some text. For ...
- 713
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50
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Attempting to use a variable set from a read of a .csv file as the pattern to grep a second .csv file
I have two .csv files. The first file has a column of words. The second has two columns with the first column containing values that match one of the entries in the first file. I want to read the ...
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-1
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1
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31
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looking for paragraphs that contain every pattern in a list
I have a list of words in a file called pattern.txt.
I need to search paragraphs of an input stream that contain ALL the patterns in the list. For a single pattern (foo) in paragraph I normally use ...
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126
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Save the output of earlier tailed logs to a file?
Is it possible to save the output of earlier tailed logs to a file?
Steps to Reproduce this issue:
tail -f application.log
Ctrl+C to end the logs
Save that output to a file now.
I am assuming an ...
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1
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147
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What are the security implications of piping apt output compared to apt-get?
I tried to install all python3 packages so that I don't have to manually go to terminal and install one everytime. However due to some dependency issues apt refused to proceed:
sonic@boomboom:~$ sudo ...
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1
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26
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bash non greedy grep between two phrases
I'm running a curl command to send data to a remote server. Part of the command is --trace-ascii which shows the full output for curl.
I'm trying to grep this output so I only get the posted data.
...
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Just as there is "locate" to "find". Is there a database for a faster "grep"?
locate (or rather, updatedb) is somewhat simple: it takes the output of find for the required paths (usually '/'), sorts it, and then compresses it with a front-compression tool (frcode), in which the ...
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How do I use grep, awk, or sed to get a substring of a line up until a string literal?
I am trying to process a text file and omit a certain string literal if it occurs at the end of the line. E.g.:
Source:
ABC 123
DEF, characters I don't want
GHI, these characters are ok
Desired ...
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OpenVPN using Luci (OpenWRT) ssh commands to get instances and enable/disable them
Hey all I have been researching how to go about doing this but I have not really found anything on it.
What I am trying to do is, use SSH luci, get a list of all my OpenVPN instances:
And be able to ...
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In journalctl internal grep, is it possible to specify option to only output matched pattern?
I have the following journal messages:
$ journalctl _COMM=kwin_wayland -o cat --since "-10s"
...
kwin_screencast: Dropping a screencast frame because the compositor is slow
kwin_screencast: ...
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71
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Handling Space in Filename for sed command
I have 3 files: en.json, en 1.json and en 2.json. All of them have the below content
{
"ABC" : "/long_name",
"DFG" : "/{long_name}"
}
I run ...
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42
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How to grep n lines from the first occurence of a string in linux? [duplicate]
I need to share logs to developers. They keep asking for more logs. So, I'm wondering is there a way to grep 1000 or so lines after the first occurence of a string in linux.
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Limit 'grep -rnw . -e "string_to_search"' to only display filenames and not the contents?
grep -rnw . -e "string_to_search"
This command takes the input string mentioned above and lists all the files in the current directory (indicated by a dot) that contain that string.
The ...
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69
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Passing multiple includes that contain spaces to grep
I'm creating PowerShell and Bash scripts to standardise our usage of the former's Get-ChildItem and Select-String and the latter's grep.
As part of the Bash script, I'm taking command-line arguments, ...
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sudo cannot ls root owned files in /proc
I am on Debian 12 and I am trying to write a script to identify processes with certain inodes (from /proc/net/raw and /proc/net/packet).
My original grep command is this (to get only the pid itself):
...
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How to find the most recent file that contains a string
I have a directory containing several files. I need to know the full path of only the most recent file that contains a certain string.
This needs to work on macOS, and the directory path contains ...
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Remove exact line from file if present, leave the rest of lines; error-handling - how to go about it
I am not exactly sure how text processing should be done in a good way, so let me ask.
I have this file: ~/.config/mpv/input.conf containing possibly other options as well as v disable.
If I want to ...
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933
views
Use uniq to filter adjacent lines in pipeline
I'm trying to monitor theme changes using this command:
dbus-monitor --session "interface='org.freedesktop.portal.Settings', member=SettingChanged" | grep -o "uint32 ."
Output ...
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82
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grep text only from files less than x size inside 7z
I have a 7z file that contains binary data and both large (>1Mb) and small (<1Mb) XML files.
I want to find only the small XML files that contain a specific string. I've tried using zgrep, but ...
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99
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How to use the -E option of grep matching some variable name
We want to know about the correct method for matching some variable name(including its $ prefix) via using the grep -E option.
It seems that this grep macthing function can only work with either no ...
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56
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How to assign output of Grep in a Variable
I am trying to assign the output of grep in a variable .
The below command provide me the correct output in a script
str="DWMessStage-20230609-083501.xml__a6e27c1.4a73a37b.13.1889d3efa14.N7f9d....
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107
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Grep not working - searching a file with a variable
I am trying to use grep to find the lines in a file that start with a specific variable I am defining. I know that you need to use double quotes with this command when searching with a variable, but ...
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4
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103
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Find text files where the content is duplicated?
By mistake I appended (>>) rather than overwrote (>) the output from a script that processed thousands of files, but I only did it for about 20 % of the files (I ran 5 parallel instances of ...
- 1,713
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67
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Alternative to multiple greps [duplicate]
I am reading a list of outputs for pipewire in a shell script and looking for a specific entry. I don't know the exact name but I know the words that are in it. To find it I am using multiple greps ...
0
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1
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28
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Need help structuring a nested zgrep to produce a count
I've been assisting with some reporting at work, and am trying to get a unique count of different elements from some rather large log files that we are generating. So far, I've been able to run two ...
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What does "^ii" mean in the command grep -c "^ii"
Description
To find the number of packages installed on the system, I tried the command dpkg -l | grep -c "^ii" (found here: How to show the number of installed packages).
Questions
It ...
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39
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find content of files with other text and combination of xml tags, grep in grep?
I have a lot of files that match a grep 'xmltag' and 'subtag'.
random xml
needed_text
random xml
<xmltag>
<subtag>content</subtag>
</xmltag>
I want to search for files that ...
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79
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How to remove characters after specific word using grep command in BBEDIT?
I have these data where I need to remove the extended URL from each website to make it, previously I used ^.+?(?=.com ) to remove the front line of characters. This time I need to remove the words ...
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