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• grep is inconsistently defaulting to grep -P?

  - by Sammitch

  I have a script that does some housekeeping that works perfectly well when invoked from an interactive shell, but did nothing when invoked by cron. To troubleshoot this I started a shell with a 'blank' environment with the command: env -i /bin/bash --noprofile --norc Using this blank env I've dug into my script and found that the following grep will not match any files: grep -il "^ws_status\s*=\s*[\"']remove[\"']$" However, when run from an interactive shell the command will return the filenames of the matching files. As a note, the expression is matching lines like: WS_STATUS = "remove" Through trial-and-error I discovered that adding -P to the options [Perl regex] the command started working normally in the 'blank' shell. However, I have no idea why my login shell appears to be defaulted to grep -P. There is only one grep binary, /bin/grep There are no aliases defined for grep=pgrep or grep="grep -P" There is no env variable GREP_OPTIONS defined. What's the deal here? Note: OS is RHEL v5.10, Bash is v3.2.25, grep is v2.5.1

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• Grep failing with Emacs (windows), and GnuWin32 Grep

  - by Andy

  Hi, I've downloaded and installed the GnuWin32 tools, and added the grep executables to the Emacs bin. I've also, for what its worth, added the GnuWin32 bin folder to my Path variable. Problem is though, when I try and run with suggested grep commands, I always get: Grep exited abnormally with code 53 at Wed Feb 24 17:16:12 For the life of me, I can't find any reference to error code 53 anywhere! :( I've tried the exact examples on a number of websites for example, when I enter: M-x grep <ret> It comes up with Run grep (like this): grep -n Which is fine, but I have no idea of what parameters it expects. I've tried some in some tuorials, but I get error code 53 again! One of the things I've tried is straight from the emacs wiki (http://www.emacswiki.org/emacs/GrepMode#toc2) (maybe not for the windows version though?) and it says to try this command: M-x grep -n -e setq ~/.emacs Which I've tried and I get: -*- mode: grep; default-directory: "c:/[My Directory]/" -*- Grep started at Wed Feb 24 17:30:47 grep -n -e setq ~/.emacs NUL Grep exited abnormally with code 53 at Wed Feb 24 17:30:47 So frustrating as this is meant to be a powerful feature of Emacs and I'm really trying to learn it as I've heard good things about it! Any help would be appreciated! :) Andy UPDATE From the suggestion below, I've tried it via command line and it seems to work fine, perhaps there some config I'm UPDATE I've found the command M-x Occur which seems to do much the same as I would image grep does. Are there many extra benefits to using grep over occur if I can't get this working?

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• grep pattern interpretted differently in 2 different systems with same grep version

  - by Lance Woodson

  We manufacture a linux appliance for data centers, and all are running fedora installed from the same kickstart process. There are different hardware versions, some with IDE hard drives and some SCSI, so the filesystems may be at /dev/sdaN or /dev/hdaN. We have a web interface into these appliances that show disk usage, which is generated using "df | grep /dev/*da". This generally works for both hardware versions, giving an output like follows: /dev/sda2 5952284 3507816 2137228 63% / /dev/sda5 67670876 9128796 55049152 15% /data /dev/sda1 101086 11976 83891 13% /boot However, for one machine, we get the following result from that command: Binary file /dev/sda matches It seems that its grepping files matching /dev/*da for an unknown pattern for some reason, only on this box that is seemingly identical in grep version, packages, kernel, and hardware. I switched the grep pattern to be "/dev/.da" and everything works as expected on this troublesome box, but I hate not knowing why this is happening. Anyone have any ideas? Or perhaps some other tests to try?

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• grep --exclude/--include syntax (do not grep through certain files)

  - by Piskvor

  I'm looking for the string "foo=" (without quotes) in text files in a directory tree. It's on a common Linux machine, I have bash shell: grep -ircl "foo=" * In the directories are also many binary files which match "foo=". As these results are not relevant and slow down the search, I want grep to skip searching these files (mostly JPEG and PNG images): how would I do that? I know there are the --exclude=PATTERN and --include=PATTERN options, but what is the pattern format? manpage of grep says: --include=PATTERN Recurse in directories only searching file matching PATTERN. --exclude=PATTERN Recurse in directories skip file matching PATTERN. Searching on grep include, grep include exclude, grep exclude and variants did not find anything relevant If there's a better way of grepping only in certain files, I'm all for it; moving the offending files is not an option, I can't search only certain directories (the directory structure is a big mess, with everything everywhere). Also, I can't install anything, so I have to do with common tools (like grep or the suggested find). UPDATES: @Adam Rosenfield's answer is just what I was looking for: grep -ircl --exclude=*.{png,jpg} "foo=" * @rmeador's answer is also a good solution: grep -Ir --exclude="*\.svn*" "pattern" * It searches recursively, ignores binary files, and doesn't look inside Subversion hidden folders.(...)

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• Grep, no value return

  - by Daniel S.

  I am searching for a word, in this case "hehe" that is located in the file findTest by using grep, but when i initiate the search: grep -r "hehe" or grep -lr "hehe" it starts but after 5 min waiting nothing happens, even if i am in the same directory as the file. the only way i get a results straight away is being in the same directory and typing: grep "hehe" findTest Are their any other ways to search for a word? even if not in the same directory.

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• Attempting to GREP details of a Java error

  - by BOMEz

  I'm running Ubuntu 11 and I'm having some issues with grep. I have a shell script (see below) which essentially checks if a certain Java program of mine is running, if not it runs it. That part works out great! If my Java application throws any kind of exception however I would like to capture that information and email it to myself. How can I go about checking to see if the call to java -jar /bin/MyApp.jar fails? I tried piping it to grep, but that doesn't seem to work. Below is the full script that I've written: #Check if MyApp.jar is running, if not run it. if [ $(ps aux | grep 'java' | grep -v grep | wc -l | tr -s "\n") -eq 0 ] then echo "PacketCapture Starting...\n" java -jar /bin/MyApp.jar echo "PacketCapture Started.\n" else echo "PacketCapture already running.\n" fi

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• recursive grep started at / hangs

  - by Martin

  I have used following grep search pattern on multiple platforms: grep -r -I -D skip 'string_to_match' / For example on FreeBSD 8.0, FreeBSD 6.4 and Debian 6.0(squeeze). Command does a recursive search starting from root directory, assumes that binary files do not have the 'string_to_match' and skips devices, sockets and named pipes. FreeBSD 8.0 and FreeBSD 6.4 use GNU grep version 2.5.1 and Debian 6.0 uses GNU grep version 2.6.3. On FreeBSD 6.4, last information printed to stderr was "grep: /dev/cuad0: Device busy". After this grep just idles as according to "top -m io -o total" the I/O usage of grep is nonexistent. Same behavior is true under FreeBSD 8.0, but last information sent to stderr is "grep: /tmp/.wine-0: Permission denied" on my installation. In case of Debian, last output to stderr is "grep: /proc/sysrq-trigger: Input/output error". If I check the I/O usage of grep process under Debian, it is following: root@Debian:~# iotop -bp 22439 Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 22439 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % grep -r -I -D skip 10.10.10.99 / Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 22439 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % grep -r -I -D skip 10.10.10.99 / Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 22439 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % grep -r -I -D skip 10.10.10.99 / ^Croot@Debian:~# What might cause this? Is there a way to view which file grep is currently processing in case lsof is not present? I'm able to use lsof under Debian and looks like the problematic file name there is "0xc6b2c230 file struct, ty=0, op=0xc0d34120". I'm not sure what this is.. I'm not able to use lsof or fstat under FreeBSD. PS: I know I could use find utility, but this is not the question.

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• grep simply fails when used on a few files

  - by Reid

  I've been trying for about the past 30 minutes to get this to work properly. grep is not exactly the most difficult thing to use, so I'm somewhat baffled as to why this won't work. The files I'm trying to use grep on are simple XHTML log files. Their names are in the format [email protected], though I don't think that should matter, and inside is simple XHTML. I copied one such log file to be testfile so you can see the output of some commands and why it's baffling to me: [~/.chatlogs_windows/dec] > whoami reid [~/.chatlogs_windows/dec] > type grep grep is /bin/grep [~/.chatlogs_windows/dec] > uname -a Linux reid-pc 2.6.35-22-generic #33-Ubuntu SMP Sun Sep 19 20:32:27 UTC 2010 x86_64 GNU/Linux [~/.chatlogs_windows/dec] > head -1 /etc/issue Linux Mint 10 Julia [~/.chatlogs_windows/dec] > ls -Alh | grep testfile -rw-r--r-- 1 reid reid 63K 2011-01-10 12:45 testfile [~/.chatlogs_windows/dec] > tail -3 testfile </body> </html> [~/.chatlogs_windows/dec] > file testfile testfile: XML document text [~/.chatlogs_windows/dec] > grep html testfile [~/.chatlogs_windows/dec] > grep body testfile [~/.chatlogs_windows/dec] > grep "</html>" testfile [~/.chatlogs_windows/dec] > grep "</body>" testfile [~/.chatlogs_windows/dec] > cat testfile | grep html [~/.chatlogs_windows/dec] > cat testfile | wc -l 231 [~/.chatlogs_windows/dec] > cat testfile | tail -3 </body> </html> [~/.chatlogs_windows/dec] > chmod a+rw testfile && ls -Alh | grep testfile -rw-rw-rw- 1 reid reid 63K 2011-01-10 12:45 testfile [~/.chatlogs_windows/dec] > grep html testfile That's what I'm attempting to do. I want to just use grep -ri query . in ~/.chatlogs_windows, which normally works perfectly for me... but for some reason, it completely fails at going through these files. If it matters, I copied these files off of my Windows 7 partition. But I chown'd them and gave myself all the appropriate permissions, and other programs (like cat) seem to read them just fine. I also copied testfile to testfile_unix and converted the line endings and tried that, but it didn't work either. I'm using zsh, but I tried it on bash and that failed too. Also, grep works normally: I tried it out on my documents folder and it worked flawlessly. If you need any more information, just let me know. I tried googling around, but I found no reason for grep to simply not work. Thanks in advance.

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• Can't pipe or redirect cygwin grep output

  - by Thomas

  How do I get grep to work properly in a regular cmd.exe? > grep -o 'ProductVersion\".*\".*\"' foo.txt | grep -o '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' foo.txt:ProductVersion" Value="59.59.140.59" grep: |: No such file or directory grep: grep: No such file or directory grep: [0-9]+\.[0-9]+\.[0-9]+\.[0-9]+: No such file or directory and > grep -o 'ProductVersion\".*\".*\"' foo.txt >> blah.txt foo.txt:ProductVersion" Value="59.59.140.59" grep: >>: No such file or directory grep: blah.txt: No such file or directory

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• How do I grep in a variable?

  - by Ashfame

  How to do a grep in a variable? I have stored the wget output in a variable and I need to extract out some strings from it. Like the content of the variable is upgrade http://wordpress.org/download/ http://wordpress.org/wordpress-3.0.5.zip 3.0.5 en_US 4.3 4.1.2 I need to check if the string contains the word upgrade, so I can do a simple grep and then check the exit status of it by $? and proceed. But how can I get the value 3.0.5 which is actually the fourth word? And how to actually grep in a variable?

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• Grep in a variable

  - by Ashfame

  How to do a grep in a variable? I have stored the wget output in a variable and I need to extract out some strings from it. Like the content of the variable is upgrade http://wordpress.org/download/ http://wordpress.org/wordpress-3.0.5.zip 3.0.5 en_US 4.3 4.1.2 I need to check if the string contains the word upgrade, so I can do a simple grep and then check the exit status of it by $? and proceed. But how can I get the value 3.0.5 which is actually the fourth word? And how to actually grep in a variable?

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• using grep with pipe and ampersand to filter errors from find

  - by HKK

  I am using cygwin to find a file on the cygdrive. However I need to suppress the permission denied messages (otherwise the results get hidden in the error messages). The following command works: find -name 'myfile.*' |& grep -v "Permission denied" I don't understand why the ampersand needs to be put into this command, would have expected this to work but it doesn't. find -name 'myfile.*' | grep -v "Permission denied" Please explain the meaning of the ampersand.

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• find grep pipe and ampersand

  - by HKK

  I am using cygwin to find a file on the cygdrive. However I need to suppress the permission denied messages (otherwise the results get hidden in the error messages). The following command works: find -name 'myfile.*' |& grep -v "Permission denied" I don't understand why the ampersand needs to be put into this command, would have expected this to work but it doesn't. find -name 'myfile.*' | grep -v "Permission denied" Please explain the meaning of the ampersand.

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• Grep only shows last match

  - by Bannix

  I've got a problem with grep. When I use it as followed, it only shows the last match in every line and what follows after it. For example: If I use tail -F example.log | grep -a -i -e "word1" -e "word2" -e "word3" and example.log contains word1 this word2 is word3 a test only "word3 a test" will be displayed. How can I display the whole line and not only the last matched string in a line + rest of the line? I hope you can understand what I mean and help me :) Greetings, Bannix

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• Problem manipulating text using grep

  - by moata_u

  I want to search for a line that contains log4j and take 7 lines before and 3 lines after the match. grep -B7 -A3 "log4j" web.xml After that I want to add comment tags before this paragraph and after it. <!-- paragraph that i found by grep --> I wrote this script bellow: search=`find . -name 'web.xml'` text=`grep -B7 -A3 "log4j" $search` sed -i "/$text/c $newparagraph" $search It's not working. Is there any way to just add comment symbol not replace the paragraph? What I want to the script to do: search for the paragraph append append -- at the end Edit: This is the paragraph that am trying manipulate : <context-param> <param-name>log4jConfigLocation</param-name> <param-value>/WEB-INF/classes/log4j.properties</param-value> </context-param> <listener> <listenerclass> org.springframework.web.util.Log4jConfigListener </listener-class> </listener> This paragraph is part of many paragraphs! I want make it like this: <!-- <context-param> <param-name>log4jConfigLocation</param-name> <param-value>/WEB-INF/classes/log4j.properties</param-value> </context-param> <listener> <listenerclass> org.springframework.web.util.Log4jConfigListener </listener-class> </listener> -->

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• How to grep the output of youtube-dl?

  - by mohtaw

  The normal output for youtube-dl is the following [download] Downloading video #3 of 33 [youtube] WbWb0u8bJrU: Downloading webpage [youtube] WbWb0u8bJrU: Downloading video info webpage [youtube] WbWb0u8bJrU: Extracting video information [download] Resuming download at byte 107919109 [download] Destination: Lec 6.mp4 [download] 86.2% of 137.18MiB at 48.80KiB/s ETA 06:37 I need to show the first and last monitor the downloading I use the command youtube-dl -cit -f 18 URL | grep -e ETA -e "Downloading video #" It's not working only the first line is working while the last line is not, and I see the download is running as the file size grows

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• Grep through subdirectories

  - by Kathryn

  Add a string to a text file from terminal I've been looking at this thread. The solution (number 2, with ls | grep) works perfectly for files called .txt in the current directory. How about if I wanted to search through a directory and the subdirectories therein? For example, I have to search through a directory that has many subdirectories, and they have many subdirectories etc. I'm new to Linux sorry, so I'm not sure if this is the right place

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• GUI for watching logs (tail and grep)

  - by Grzegorz Oledzki

  Could you recommend a GUI application with powerful log watching capabilities? Generally it would work as tail -f in GUI, but on top of that following features would be very useful: filtering out some lines based on (regular) expressions coloring some lines based on (regular) expressions interactive search saveable configuration easily applicable to different files notifications based on (regular) expressions A similar tool on Windows is BareTail and its paid version - BareTailPro

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• GUI for watching logs (tail and grep)

  - by Grzegorz Oledzki

  Could you recommend a GUI application with powerful log watching capabilities? Generally it would work as tail -f in GUI, but on top of that following features would be very useful: filtering out some lines based on (regular) expressions coloring some lines based on (regular) expressions interactive search saveable configuration easily applicable to different files notifications based on (regular) expressions A similar tool on Windows is BareTail and its paid version - BareTailPro

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• grep only returns help text

  - by Pete Mancini

  Well, I am perplexed. I am working with an Ubuntu server and I type in grep 'bash' *.sh BUT fgrep 'bash' *.sh works like a champ. which grep and which fgrep both point to their respective executables in /bin. I am perplexed as to what I am doing wrong. EXAMPLE output: $ grep -F 'grounding' repl.clj Usage: grep [OPTION]... PATTERN [FILE]... Search for PATTERN in each FILE or standard input. PATTERN is, by default, a basic regular expression (BRE). Example: grep -i 'hello world' menu.h main.c $ fgrep 'grounding' repl.clj (p/concepts-for-grounding-term imp1 "PERSON" "summary") See? grep is failing but fgrep is working fine. That is why I am perplexed.

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• grep -v -A not working properly (actually not working at all)

  - by Lo'oris

  I have to filter lines like the following: [javac] /Users/looris/Sviluppo/android/projects/toutry/src/net/looris/toutry/Stuff.java:23: warning: unmappable character for encoding ascii [javac] return (poked=false); // NOTA: è un'assegnazione, non un controllo! [javac] ^ I've tried |grep -v -A2 "unmappable character for encoding ascii" but it just does nothing. If I just do |grep -v "unmappable character for encoding ascii" it does filter that line, but I need to filter the following two lines too. (using "grep (GNU grep) 2.5.1" under OSX 10.5)

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• grep not functioning correctly

  - by ak0

  I've been happily using grep for many years without any issues, but since today it quit working. During the past hour I tried this and that, but enough is enough, I'm posting the bastard here: On the simplest command like grep 'aaa' file.txt I'm getting this: grep: aaa: No such file or directory So grep does not interpret the first argument as the pattern as it should, but treats it as a path. Please help me, I'm going crazy '-(

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• Grep a strange acirc character

  - by John Hunt

  I have this character appearing in places in some files I have:  (if you can't see it or it looks like a question mark it's the Acirc character (capital A with a circumflex over it)) I simply want to grep replace this char with a space, however when I do this: grep --color -ri  myproject.php Putty gets very confused, as does grep. As I understand it there's probably a way to use an escaped hex code with grep.. does anyone know how? EDIT: The character is showing up on my web page as a weird <?>. The http headers for the page specify utf-8 as does the meta character set and I still see the strange character. In putty it appears as a space (putty also set to utf-8.) When I copy from vim and paste into grep it simply doesn't find it. Cheers, John

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• Passing a file with multiple patterns to grep

  - by Michael Goldshteyn

  Let's say we have two files. match.txt: A file containing patterns to match: fed ghi tsr qpo data.txt: A file containing lines of text: abc fed ghi jkl mno pqr stu vwx zyx wvu tsr qpo Now, I want to issue a grep command that should return the first and third line from data.txt: abc fed ghi jkl zyx wvu tsr qpo ... because each of these two lines match one of the patterns in match.txt. I have tried: grep -F -f match.txt data.txt but that returns no results. grep info: GNU grep 2.6.3 (cygwin) OS info: Windows 2008 R2 Update: It seems, that grep is confused by the space in the search pattern lines, but with the -F flag, it should be treating each line in match.txt as an individual match pattern.

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• [Single|Double|Or no] Quotes when using grep?

  - by Hamy

  Grep acts differently depending on what kind of quotes I surround the regex with. I can't seem to get a clear understanding of why this is. Here is an example of the problem: hamiltont$ grep -e show\( test.txt variable.show(); variable.show(a); variable.show(abc, 132); variableshow(); hamiltont$ grep -e "show\(" test.txt grep: Unmatched ( or \( hamiltont$ grep -e 'show\(' test.txt grep: Unmatched ( or \( I am just assuming there is some proper way to enclose the regex with single/double quotes. Any help? FWIW, grep --version returns grep (GNU grep) 2.5.1

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