Questions tagged [grep]
grep is a Unix command-line utility that searches input for lines matching (or not) a regular expression and prints the results. Use this tag for questions about how to use grep features, how to write regular expressions that work with grep, and general usage. Because grep is now available in Unix-like environments (e.g., Cygwin on Windows), you can also use this tag for compatibility questions, and differences between versions and software environments.
1,101
questions
1
vote
2
answers
134
views
How to search for all text lines that start with a tab character?
I need to find all lines in a text file that start with a tab character.
I tried this command:
findstr /B /R "\t" test.txt
But it doesn't print any lines.
I also tried with grep.exe (taken ...
- 209
-1
votes
1
answer
36
views
grep output to file does not work - ping www.google.com |grep -v "time=1." >>ping.log
ping www.google.com |grep -v "time=1." >>ping.log
Nothing is appended to the logfile, without the redirection the command works fine. What am I doing wrong ?
- 1
6
votes
2
answers
467
views
Maven - ignore ANSI color escaping chars in grep search
I find that sometimes, ANSI escaping chars in mvn output prevents me to do this search with grep:
mvn | grep -P "\[INFO\]"
I have to use "\[.*INFO.*\]" to get results.
How to ...
- 592
0
votes
1
answer
47
views
Using grep to search for files with a specific extension [duplicate]
I'm trying to recursively look for C Sharp files containing specific text using a bash prompt on Windows Subsystem for Linux.
If I type grep -l -i -r "public virtual List<" /mnt/c/mycode/*...
- 1,203
4
votes
3
answers
694
views
How to check if a command is running currently? [duplicate]
I want to check if a command is running with the following if clause, but it's always true, whether command actually is running or not:
if [ $"(ps aux | grep curl)" ]; then echo is; else ...
- 387
0
votes
1
answer
43
views
Does Microsoft word have wildcards for return (\r) & new line (\n) like Grep or Regex do?
I frequently want to replace multiple consecutive return characters in written documents with a single return character and to use paragraph space (space after) to do the formatting. Sometimes there ...
- 103
1
vote
1
answer
110
views
BBEDIT multi-file search : multiple find&eplace queries simultaneously?
In another thread
grep search
got the proper use right for the OR argument in a grep search in BBEDIT and so was wondering whether this can be expanded as following :
is it possible to have a given ...
0
votes
2
answers
173
views
Replace between brackets content sublime & regex
I've actually got lines like this:
[Sat Dec 31 18:24:18.700 2022] 0.017 sec 0.017 sec [all/2/rel 37 (0,700) @groupparentid] [post]keyword
How can I delete the whole line starting with bracket [ and ...
- 1
0
votes
1
answer
27
views
How to highlight text using color in output if in a certain temp range
I am outputting the HDD temps of my system to a text file on a local webserver that I can check every once in a while to monitor hdd temps when the system is under load. I was wondering if there is a ...
- 1
0
votes
0
answers
90
views
bash loop to create m3u file with sed awk grep
I am trying to auto create m3u file for my IPTV software with the help of sed/awk or grep command,but don't have much experience in this. expert help required to do this. working on Windows-10 PC ...
- 21
3
votes
1
answer
99
views
Getting average CPU frequency
Which command should I use to get the average CPU frequency? inxi -C requires sudo.
I looked on the internet, but could not find a non-sudo command that would display what I want. I don't mind ...
- 33
0
votes
2
answers
84
views
How to combine tee, sed and grep?
I have a command after which I place | tee >(sed $'s/\033[[][^A-Za-z]*[A-Za-z]//g' >> ~user/filepath/file.txt) The tee is redirected to sed $'s/\033[[][^A-Za-z]*[A-Za-z]//g' which removes the ...
- 11
0
votes
1
answer
60
views
gnu grep -r -R -recursive not working on Windows 11
I submitted the following commands through the cmd window on a Windows 11 machine:
grep -r --include=*.c "return"
grep -r --include="*.c" return
grep --recursive --include=*.c ...
- 13
0
votes
1
answer
44
views
Grepping an specific command give me an old grep output
I need some help, wasn't able to find a solution...
I've made a script to run xfs_growfs and pipe its output to know only if the it found no difference is disk size and gave me an "data size ...
0
votes
1
answer
29
views
Linux - Find string and then end of section
I have an XMLTV file. I need to get all of the programme sections for a specific channel. An example snippet:
<programme start="2023031305000 -0400" end="2023031305300 -0400&...
15
votes
1
answer
2k
views
Why does my "grep" stop filtering a non-ASCII file it thinks is "binary"?
I'm working with a Windows-10 computer, using a WSL.
I'm investigating a logfile, produced by NLog in a C# application. I'm expecting log entries to appear everywhere throughout the file, but I see ...
- 1,931
0
votes
1
answer
27
views
In some of my VMs grep does not show color. Is there any shorter switch for `grep --color`?
I have to ssh login to so many VMs / containers.
In some of my VMs grep does not show color. Is there any grep default settings?
Is there any shorter version of grep --color switch?
- 639
1
vote
1
answer
112
views
Waiting until a string appears in a log file
I have a log file that text is appended to during the program run.
I want to know when a specific string was appended to the end of the file.
All the solutions given here:
Monitoring a file until a ...
- 13
0
votes
1
answer
61
views
Grep -f seems to return every file in a directory
I am using grep -f to search through a directory for files that match the strings in the file I provide. Below is the command I am using
$find $(pwd) -type f |grep -f list.txt >result.txt
I am ...
- 11
1
vote
1
answer
39
views
How do I correctly execute 'vim $(grep -rli pattern | sed 's/\(.*\)/"&"/')' in bash?
I am trying to edit files that contain text matching a regular expression with vim and use the following command in bash to do that:
vim $(grep -rli pattern | sed 's/\(.*\)/"&"/')
I ...
- 2,219
1
vote
1
answer
50
views
Can I replicate the `strings` command using `grep`?
I often use a Windows Git Bash environment, which doesn't contain the strings command.
Is is it possible to use a tool like grep to output all the strings of ASCII or printable characters above a ...
- 7,112
0
votes
1
answer
33
views
How to grab filter the numbers of results
I use grep -E '^[ 0-9]{6}$' to grab strings of 5 digits (numbers or space) in files
It returns:
71 051
17 293
017299
862610
But is it possible to extract only the 2 first occurrences?
If possible ...
Jean-gabriel Lopez
0
votes
0
answers
45
views
grep with -P (=PCRE) and ext regex pattern (?(cond)yes-pat) does output line despite non-match, what do I wrong?
I am using grep version
grep (GMU grep) 3.0
and I have tried following test code with these results:
echo "ab" | grep -P '(?<=a)b'; WE_retcod=$?
yields
ab (b is colored)
retcode is 0
ok
...
- 109
0
votes
0
answers
184
views
Windows CMD - Is there any way of getting the plain text from a compiled CHM help file and/or a PDF?
I have a build chain based on Windows batch and Python files. As part of the build, there are variables that are determined and are then communicated to the application CHM help compiler and PDF ...
- 1,556
0
votes
0
answers
120
views
Redirect pipe contains quotation marks to a variable in Windows batch file
I am trying to get the number of substrings "id" in a file and save to a file
I am trying to do it this way:
for /F %N in ('"C:\Program Files (x86)\GnuWin32\bin\grep.exe" -o "...
4
votes
3
answers
950
views
Copying a path in the terminal with the keyboard
I often find that when using the command line, I need to copy a path that appears in the output of the last command. For example I might use find . | grep like this:
[user@localhost /tmp]$ find . | ...
- 163
5
votes
1
answer
676
views
How to print and pipe log file at the same time?
I use this to check the log lines of a log file until the occurrence of a specific event (taken from this answer to Monitoring a file until a string is found):
(tail -f -n 0 test.log &) | grep -q '...
- 521
0
votes
0
answers
21
views
mingw grep does not find matched results
grep -rn "bg.tool" "pom.xml" does not find any result in pom.xml. However, many pom.xml in the current directory or its subdirectories contain that string. Is it a MINGW thing, or ...
- 2,860
0
votes
1
answer
210
views
ext2fs and e2p packages are not found
I'm installing ext4magic on CentOS 7. When I run ./configure it stops at a certain point returning an error message.
configure error: You must install the develop packages "ext2fs, blkid, e2p, ...
- 111
2
votes
1
answer
131
views
Is there a way to Grep multiple HTML pages on a domain without downloading the files?
I essentially want to Ctrl+F multiple sites in a browser.
I have a range of URLs on a domain https://exampleblog.com/posts/{1-50}
I want to grep all of the pages under /posts/ at once. They are each ...
- 23
1
vote
1
answer
261
views
grep search count occurrences in number of files in recursive folder tree
Say I have 1000 files in multiple recursive folders and say the string 'testing' is in 600 files and total number of mention of 'testing' within those 600 files is 750 times. Then -
I need something ...
- 13
0
votes
0
answers
674
views
egrep warning: egrep is obsolescent; using egrep -E
could someone help me with the problem I had when installing and starting xampp, it shows me this error. (Arch-Linux)
sudo /opt/lampp/lampp start
XAMPP: Starting Apache...egrep: warning: egrep is ...
0
votes
3
answers
102
views
Get a valid path with random directory name from a text file
How to to get the valid path from a string?
For example I have the following text in file.txt that will always generate with a random path using the following patern:
Some error occurred. rerun the ...
- 103
0
votes
1
answer
342
views
How do I change the order in which grep looks for pattern in files by filename
I have a directory with a bunch of files with numerical filenames like this:
1 - filename
2 - filename
3 - filename
etc...
They don't have leading zeroes, so if I do something like
grep -oha "...
- 1
0
votes
1
answer
42
views
Select group of words
I am trying to capture all the words which are bold including the colon.
I am using the following code which is not working.
(1)This is heading: This is description of heading; This is another: This ...
- 53
0
votes
0
answers
50
views
How to move all old files from Downloads to the trash with one or more terminal commands in macos?
I already found the command with which I can select all the files and directories that I do not want to send to trash. That command looks like this:
find ~/Downloads -newerat "2 months ago" -...
- 131
-1
votes
3
answers
734
views
sed or grep command to extract all lines that match a particular date and time range
2022-09-08T08:55:10+02:00
2022-09-08T19:55:16+02:00 200 200 76 0GET /v1/heartbeat/tcanalytics HTTP/1.1
2022-09-08T23:55:17+02:00 200 200 POST /...
0
votes
1
answer
221
views
how to grep only text preceded by several ‘=’ characters
I want to grep only text preceded by several ‘=’ characters.
tried this but doesn't work
cat sometext.txt | grep \=
and
cat sometext.txt | grep ^--[[:alpha:]]\{2,\}=[^=]\+$
(where sometext.txt is ...
- 101
1
vote
2
answers
55
views
Reverse Quotes in a document using Regex
I have a document which contains lots of sentences in quotes. Issue is that some of them are properly quoted and some of them have reverse quotes, meaning the opening quotes are at the end of the ...
- 53
0
votes
1
answer
551
views
Replace strings from text file with csv values
I've got a txt file (template.txt) with stuff like:
Hostname from Client: !hostname . OS !windowsversion
and a CSV-Export from many clients:
!hostname, !windowsversion
exampleName, Windows10-Pro
I'm ...
- 1
2
votes
0
answers
284
views
Why would the windows implementation of grep command here, from cmd, give an error message of trailing backslash?
Why would the windows implementation of grep command here, and from cmd, give an error message of trailing backslash?
C:\Users\User>where grep
c:\cygwin\bin\grep.exe
C:\Users\User>c:\cygwin\...
- 23.2k
0
votes
2
answers
202
views
In Windows cmd, does grep use GetCommandLine(), and findstr use argv?
In Windows cmd, does grep use GetCommandLine(), and findstr use argv?
This is the grep i'm using
C:\>where grep
c:\cygwin\bin\grep.exe
C:\>c:\cygwin\bin\grep.exe --version
grep (GNU grep) 3.7
...
- 23.2k
1
vote
1
answer
135
views
what is the difference between 'grep -n ' \.*' test.txt' and grep -n '\.*' test.txt
When I run grep -n ' \.*' test.txt , I get:
1:Hello! This is a Unix \ Linux test text file.
2:It is being used to check multiple grep commands.
3:It is very useful.
4:.Below are some tabular ...
- 11
0
votes
1
answer
237
views
Capture process output with sed, capture block of text and then filter inside it
There is some stdout that I would like to filter with sed but I don't know how. The stdout example would be:
.
.
.
Model a. # This should be captured
.
.
.
Metrics results: # This ...
- 103
0
votes
1
answer
574
views
Displaying users and their home directory but NOT WITH awk
I have seen similar questions and I actually found the solution using awk command, but I'm not allowed to use it in my homework.
so I want to know if there is another way of displaying all the users ...
0
votes
2
answers
230
views
remove duplicated lines taking into account only two columns
I have a file that has some duplicated lines if I take into account only the two first columns.
For example
2 2 7 7
1 1 3 3
1 1 4 4
1 1 5 5
1 1 6 6
3 3 7 7
4 4 9 9
4 4 2 2
In this example, I have ...
- 103
0
votes
1
answer
45
views
Insert new line if file contain string
I need to insert 'import packagename' to the line after imports. In files which contains the specific word.
What I try:
find iOS/Chat \
-type f \
-name "*.swift" \
-exec gsed -e "/...
- 101
0
votes
2
answers
2k
views
How to group and count all lines in a file that contain specific string
I want to filter all lines from a file that contain mySearchString and after that group them together and count them.
Example find all lines that contain 9791
AB-9791___Foo
AB-9791___Foo
DE-9791___Bar
...
- 275
0
votes
1
answer
663
views
How to find a multiline partial regex match in multiple files?
I have a bunch of files. Every file can contain one or more matches for the following regex pattern:
(foo)([\s\S]+)(bar)
The matches can contain line breaks / multiple lines.
I want to extract all ...
- 1,369
1
vote
0
answers
545
views
Grepping byte offset values for data blocks of specific type in a binary file, but it's skipping blocks containing any byte larger than 127 [or 0x7F]
I have a binary file containing blocks of data. The first four bytes of each block contains a fixed byte string, five bytes after that contains the block's "type" byte. I want to find out ...
- 11