grep is a command-line tool for searching text patterns in files

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Use grep with or [duplicate]

How do I search in a textfile with grep for the occurrence of a word or another word? I want to filter the apache log file for all lines including "bot" or "spider" cat ...
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5answers
660 views

How to get the lines that contain -R with grep

How can I find "-R" in files with grep? I tried grep "-R" *.GNU to get the lines that contain -R, but it returns nothing.
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6answers
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Extract substring using regular expression on a Unix file

I have file with below contents . /ABC/RTE/AD_900_VOP_123/OPP /ABC/RTE/TRE/AD_900_VOP_145/BBB /ABC/RTE/AN_900_VFP_124/FBF /ABC/RTE/HD_900_FOP_153/WEW /ABD/RDV/AD_900_VOP_123/OPP ...
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2answers
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“Ungrep” - which patterns aren't matched

I'm looking for a command or script to do the following - given: file1.txt: abcd efgh ijkl mnop file2.txt: 123abcd123 123efgh123 123mnop123 I want a command that does something like this: ...
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4answers
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how to count total number of words in a file?

I am looking for a command to count number of all words in a file. For instance if a file is like this, today is a good day then it should print 5, since there are 5 words there.
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2answers
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Get 'less' to display filename

Something that seemed quite useful to me when looking for a certain var in a bunch of config files: less * | grep some_var So this returns the value of some_var without manually looking through all ...
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2answers
106 views

Grep and sort several unsorted things in several lines (in one document)

I have a file with several unsorted things in one line which I want to put into a new file This is an example of part of the file I have: X1314448: SaMi|SM_g2554.t1 SaMi|SM_g5072.t1 Des|Des_g3808.t1 ...
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1answer
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What is the meaning of this test expression []? [duplicate]

I've seen someone use command: ps -ef | grep [h]ttpd and Output is: apache 25125 31006 0 21:54 ? 00:00:00 /usr/sbin/httpd apache 26869 31006 0 22:04 ? 00:00:00 ...
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1answer
67 views

How to get all Users and echo if they work or not?

How do I get a list of users(given from the command line) with grep and output if they are logged/work or not ?
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1answer
10k views

Read log file between two dates

I have to read log file between and my question is how to get only the text in the file wich is between two dates using unix commands? Every line contain date and I want to get the text in the file ...
0
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1answer
302 views

How to Get FreeBSD Grep to recognize '-' option?

I am using FreeBSD grep, version 2.5.1, and want to be able to have grep read the pattern from stdin. Other versions of grep I have used allow for the specification of - to enable this feature. ...
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3answers
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| Grep, Find which file the strings came from

I have a set of PDFs, and I am running strings * | grep message This returns the strings containing that method, is there anyway I can get grep to tell me which file it is from?
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2answers
743 views

Search class names in jars

I'm using this command to search *.jar files for java classes, and I only get the name of the jars that contain those classes: grep -ral --include=*.jar SignonEJB . How can I also get the class ...
2
votes
2answers
1k views

How to find files with a certain subpath?

I need to find all xml-files that are placed in folders named config. Also config must be somewhere under a folder named trunk. For example, I am interested in all files like below: ...
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1answer
10k views

How do I redirect output from the find command (that uses grep) to a log file?

Consider the code to search for all files containing the pattern "search string": bash-3.2$ # The below find works fine.. bash-3.2$ find . -type f -exec grep -il "search string" {} \; bash-3.2$ # But ...
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1answer
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How can I keep color codes with grep input?

It I grep something twice: ... | grep foo | grep bar It seems foo is not highlighted. Infact, it seems grep removes colorcodes from its input; Any way to prevent this?
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1answer
142 views

How to ask for specific parameters with grep?

I need to look in /usr/share/dict/words for a 5-letter word that starts with d or D, followed by a lowercase vowel, and ends with s. I have tried everything but to no avail.
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2answers
228 views

Split using sed

I have to split [X] ||| you owns the [X,1] ||| you own the [X,1] ||| 1 0.02020 0.07847 0.36788 3 -0.00000 -0.00000 at the pipes and output those line whose 2nd and 3rd argument are different.
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1answer
367 views

Understanding grep --label=

I am looking for an explanation how grep --label=LABEL works: Maybe somebody can give me an example [or two] on what --label= is for. I understand what grep and zgrep are supposed to do – the ...
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2answers
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linux + match IP ADDRESS with 3 octets or with 4 octets

how to match IP address with 4 octets or with 3 octets in one command? target - match xxx.xxx.xxx or xxx.xxx.xxx.xxx ( syntax should fit for Linux and Solaris ) how to merge the following commands ...
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2answers
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Grep to search directories for patterns inside a text file

I have a file where it contains a list of search patterns (searchPattern.txt). Its contents is similar to the contents below where there are 3000+ of them. 123456 234567 345678 . . . What I wanted ...
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10answers
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How can I prevent 'grep' from showing up in ps results?

When I search for some process that doesn't exist, e.g. $ ps aux | grep fnord wayne 15745 0.0 0.0 13580 928 pts/6 S+ 03:58 0:00 grep fnord Obviously I ...
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3answers
895 views

Very strange behavior with grep and IFS

I'm having trouble using grep, the returned results are "n-empty", I mean without the 'n' character... This is the script sample : OLDIFS=$IFS IFS="\\n" i=$(grep -ril $1 *) echo $i IFS=$OLDIFS ...
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2answers
426 views

Search and replace full line in recursive files

I'm using: grep -n -H -o -R -e textword . List all file recursively under directory '.' with string 'textword' and show the file, line and only portion matching. I need to remove lines that ...
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2answers
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How to adjust column width in Linux command output

When I used this command on Red Hat Linux /usr/sbin/ss -i I get the following output below: State Recv-Q Send-Q Local Address:Port ...
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2answers
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Can I make grep treat escaped multiline as a single line?

How can I make tools like grep treat multilines escaped with a backslash as a long single line? Let's say I have some files that looks like this: testvar=test1 \ test2 \ test3 ...
5
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3answers
705 views

difference between .* and * in regular Expression

I've a file named "test" that contains linux Unixlinux Linuxunix it's linux l...x now when i use grep '\<l.*x\>' , it matches : linux it's linux l...x but when i use grep '\<l*x\>' ...
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3answers
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Trying to remove all ids from an HTML file with grep

I'm trying to remove all id=" "s from an .html file but I'm not sure where I am going wrong. I tried using regular expressions but all I am getting is the .html file rendering in my Ubuntu terminal. ...
3
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1answer
985 views

Output of `java -version` not matched by grep or awk

On my Linux machine, it isn't clear to me why if I do the following then I don't get only the version string ("1.5.0_32"). # java -version | grep version | awk '{print $NF}' java version "1.5.0_32" ...
2
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2answers
337 views

How to count the number of words and print the lines that match exactly a given pattern?

I want to count the number of words and print the matched pattern lines which matches exactly with following pattern: abc-ERROR: The input File contains: # abc-ERROR: xyxxkkfgfr # def-Error: ...
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3answers
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Uniquely identifying java processes with same name

I have two java processes which run using the same file name, MyApp.jar (for example). /usr/java/latest/bin/java -jar MyApp.jar These jars exist in different places and use different ...
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1answer
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(e)grep and atomic grouping [comprehension question]

I am trying to understand the correct use of »atomic grouping« a.k.a. »independent subexpressions« a.k.a. »non-backtracking subpattern« [this are the terms I found ...
4
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2answers
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greedy and lazy regular expressions (comprehension question)

I am teaching myself regular expressions, and I got stuck at »greedy« vs. »lazy« repeatings. What I found out so far is that »greedy« means that the RegExp ...
2
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1answer
115 views

How can I get grep to work with “->” as the pattern?

I have this text in a file called temp: -rw-r--r-- 1 root root 15776 Oct 15 2010 dnd-copy -rw-r--r-- 1 root root 15776 Oct 15 2010 dnd-link -rw-r--r-- 1 root root 15776 Oct 15 2010 dnd-move ...
2
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2answers
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add “#” in begining to selected lines in File

Requirement : ADD someting (i.e #) in begining of every line in file A which is grep from file B File A abcd abdc sdfg asdfa jon ram File B jon abcd grep file B from file A and add "#" ...
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2answers
516 views

Confused about inverse grep

So, when you use inverse in grep (egrep -v), this literally means the output is shown upside down (flipped over)? I think I was more confused when I saw the following examples $ egrep -v '\ ' ...
2
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1answer
5k views

Confused about word boundary

I have been researching this a lot, but I am still not clear on it. What does word boundary mean? What does it do? So, for example, could someone explain this command to me please? egrep ...
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3answers
5k views

Output to stdout and at the same time grep into a file

I have a script that outputs text to stdout. I want to see all this output in my terminal, and at the same time I want to filter some lines and save them in a file. Example: $ myscript Line A Line B ...
1
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1answer
1k views

What is a sure fire way to find all files and/or path that contains 2 keywords?

I was doing a find . -iname '*sitesearch*' | grep demo because I know the file should be some/path/SiteSearch/demo/SiteSearch.html, but it turned out a person put the file in as ...
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3answers
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Regular Expression for finding double characters in Bash

I am looking for a regular expression that finds all occurences of double characters in a text, a listing, etc. on the command line (Bash). Main Question: Is there a simple way to look for sequences ...
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2answers
4k views

Regular expression problem(s) in Bash: [^negate] doesn't seem to work

When I execute ls /directory | grep '[^term]' in Bash I get a regular listing, as if the grep command is ignored somehow. I tried the same thing with egrep, I tried to use it with double and single ...
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3answers
131 views

Grep end regex matching

On OS X, system_profiler SPHardwareDataType outputs: Hardware Overview: Model Name: MacBook Pro Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 8 MB Memory: 8 GB I want to ...
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2answers
10k views

Why doesn't grep ignore binary files by default?

The manpage for grep describes the -I flag as follows: -I Ignore binary files. This option is equivalent to --binary-file=without-match option. It also says this about binary files: ...
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2answers
425 views

Difference betwen grep pattern ^$ and ^

I understand that grep matches all the blank lines for the pattern ^$. But what does just ^ means. When I gave grep '^' filename. It matched all the lines. Also grep '' filename matched all the lines ...
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1answer
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How to properly use /usr/xpg4/bin/grep -F

I have a problem producing filtering out hanzoMollusc (2)from my grep. https://node.hanzo.com/production/application/ (1) https://node.hanzoMollusc.com/Messaging/Receiver (2) My grep command is ...
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1answer
618 views

ps | grep shows bad output in subshell with jobs running in the background

I am using bash. I have a file named "a2draw" that contains only 1 line: sleep 99999 I start it using this command: bash a2draw & Now, I know and understand the trick with square bracket ...
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4answers
406 views

Grep of many keywords over many files: speeding it up

I am currently facing a "performance problem" while using grep. I am trying to locate the occurrences of many (10,000+) keywords in many (think Linux kernel repository size) files. The objective is to ...
5
votes
1answer
3k views

Is GREP_OPTIONS= --color=always ignored?

I was playing around with setting GREP_OPTIONS and couldn't get it to work. Just curious as to why. Simple test commands output: richard@ubuntu:~$ echo $GREP_OPTIONS richard@ubuntu:~$ ...
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1answer
2k views

Using grep with symbolic link

I don't know how to ask this, but let me explain. I have a text file (named bla) in my ~/user/Dropbox folder. I would like to grep on it from any folder in terminal. For example, I'd like just type ...
0
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3answers
118 views

regex suggestion

echo "223255/12345678 " | grep '[0-9a-zA-Z/\-\?:\(\)\.,"\+]{1,34}' According to the regex, it can have any of 0-9 a-z A-Z / - ? : ( ) . , " + of upto 34 chars in any order. Am I ...