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

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2
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3answers
161 views

grep for all the lines that doest not have a particular word

I have a file fileA.txt Batman.plist Green Arrow.plist Hawkgirl.plist EOPrototypes.plist Person.plist EOPrototypes.plist EOJavellinPrototypes.plist Sinestro Slomon Grundy.plist Batman Beyond.plist ...
2
votes
1answer
40 views

How to match a particular form of optional sequence from a manual synopsis, including variations?

In this Q&A there is a reference to the manpages synopses being based "loosely" on the Extended Backus–Naur Form of metasyntax notation. It's interesting and serves as background. That being said, ...
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5answers
46 views

grep for text that may or may not be present

Lets say I have a file batman; robin; superman; password = ""; wonderwoman green lantern if I want to check if there is a password present, i.e there is something entered in the "" . here is an ...
0
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1answer
51 views

How to execute grep in tcl for getting XYZ-123 type pattern

can I execute this grep command in TCL? grep '[A-Z][A-Z][A-Z]\-[0-9][0-9][0-9]' file1 > file2
2
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3answers
44 views

searching multiple strings in multiple files inside a directory and printing the string and corresponding file name where it was found

I have around 500 strings and I want to search for the files which contain them inside a directory and get the file names which contain the strings. So far I've been using: find -name 'LYFNRE.*' ...
1
vote
4answers
86 views

Getting data under or above a line

This is my file: print energy 1 end Local net energy (PE 0) = 1.635393034217E+05 kJ/mol Global net ELEC energy = 1.635393034217E+05 kJ/mol print energy 2 end Local net energy (PE 0) = ...
6
votes
8answers
560 views

Grep rest of line…after match

I have a file containing only two lines, with the following structure: $ cat /tmp/pwpower.log 000D6F0000D34227, -114.10 000D6F0001A405C4, -130.09 The values are power values of my solar plant. ...
2
votes
5answers
178 views

grep change of line followed by a variable

I have a file of the following form (with '-' serving as delimiters), and I want to find the appearance of a number only when it follows a delimiter. I suppose it's a concatenation of grep '-\n' and ...
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2answers
57 views

String pattern searching [closed]

I'm new to linux. I want to be placed as a System Admin. I attended an interview at Amazon. They asked me to write a cmd to find the string that starts with 's' and ends with 'a' in a file. I jz know ...
6
votes
2answers
167 views

fastest way to grep jar file for a particular name in it?

I am trying to find all the jars which has spring in its name. I am working with windows and using cygwin to run the linux commands. Does my below command looks right? find . -name "*.jar" -exec jar ...
0
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3answers
48 views

how to export all numbers that are unique in few text files into another file?

I have a.txt,b.txt,c.txt. Each has different numbers as below: a.txt: 12 14 111 1 15 2 b.txt 12 18 22 23 1 2 c.txt 12 14 15 16 17 1200 The output should contains all the numbers from ...
0
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4answers
54 views

grep to see if a line ends with a particular string

Hello I have a file that has a lot of lines that end with main.css">, and some of them are repeated. I want to keep only one copy of these lines and delete the repeated line. Could I use grep to ...
4
votes
3answers
76 views

How do I combine the -v and -B switches in grep?

I have a list of currently installed kernels, and I'm trying to grep out both the currently installed kernel and the previously installed kernel. For this example, linux-image-3.2.0-60-generic is the ...
9
votes
5answers
5k views

How do I recursively grep through compressed archives?

I'm trying to find out what modules use Test::Version in cpan. So I've used minicpan to mirror it. My problem is that I need to iterate through the archives that are downloaded, and grep the files ...
1
vote
2answers
77 views

Aix grep wildcard not working

I have a file called message that has the line CSC/UT/USA/WBIMB/SAP/orders05:orders05/ORDERS05/NONE/ORDRSP/758 I am doing a grep (Platform is AIX 6.1) grep ...
0
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2answers
90 views

How can I grep for broken HTML tags?

I want to grep through all my HTML files and see if I have any bad tags there, example <br> , <hr> and so on, that is the I want to see what tags are not closed in the HTML file. for ...
7
votes
3answers
2k views

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.
2
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5answers
128 views

how can I print the Nth and the Mth line above or below the matching line with grep?

Let's say I have a well-structured text file with following content(no leading line numbers): 1 Mon Jun 9 00:11:47 CST 2014 2 eth0 Link encap:Ethernet HWaddr D4:BE:D9:F5:5C:0E 3 ...
0
votes
3answers
41 views

How do I match a string with symbols in a grep-kind of way? [duplicate]

I have a file with this contents (or similar): # cat /var/www/htpasswd foo:$apr1$73wJ8tiQ$HdaRYe2pUMqBf0ZpMJz6h/ and I'm trying to verify the presence of an entry in it, by matching it, like this: ...
1
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3answers
142 views

GREP / SED or AWK: Print entire paragraph in a file on pattern match

I have a file with hundreds of paragraphs of around 15 lines each. I need to search for a pattern, say Occurance: 1. If this pattern is found in the para, I need to print the entire paragraph. Note ...
1
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4answers
1k views

Using sed/awk to remove anything after first space

aaaaaaaa 09 bbbbbbbb 90 ccccccccccccccc 89 ddddd 09 Using sed/awk/replace, in the above text I want to remove anything that comes after the first space in each line. For example the output ...
9
votes
2answers
310 views

Filter output of command by color

I am running a utility that doesn't offer a way to filter its output. Nothing in the text of the output indicates that a particular function failed but it does show in red. The output is so long that ...
0
votes
1answer
41 views

How to output the lines of a file after find and a grep?

Hello I want to output ERROR messages from logfiles from the current date. First I search for the logs of today with specific prefix: find /home/USER/logfilesError/ -maxdepth 1 -type f -name "xy_*" ...
0
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2answers
34 views

How can I search filenames which are starting with xy_* and are created/edited today?

Hello I´m currently trying to search for logfiles which are starting with xy_Number and are created/edited today(not last 24 hrs). I tried: find /home/USER/logfilesError/ -maxdepth 1 -type f ...
2
votes
3answers
79 views

Find a pattern with no repeated numbers in egrep

I need help finding a regular expression to match all digit sequences which has no repeated digit. Example: 198345 -> matched. 198315 -> not matched (1 repeated twice ) How can I achieve this in ...
1
vote
3answers
248 views

Find files containing one string but not the other

I am in a folder with lots of .txt file, I would like to find all the files which contain stringA, but don't contain stringB (they are not necessarily in the same line). Does anyone know how to do ...
2
votes
2answers
637 views

Some UTF-8 characters not being recognized by grep or sed

Trying to determine all characters in a file. The file sample consists of: a eɪ abandon əˈbændən ability əˈbɪləti able ˈeɪbəl able ˈeɪbl abortion əˈbɔrʃən abortion əˈbɔrʃn about əˈbaʊt above əˈbʌv ...
0
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3answers
76 views

GREP for Processes by Directory and Kill it

I'm trying to grep for processes that originate from the /Applications/ directory (to kill them), but my grep command keeps catching some false ones as well. What am I doing wrong here? $ ps -ef | ...
6
votes
6answers
383 views

Check if a variable contains only what I want, and nothing else

I'm writing a script to build a software from sources, and there's a --platforms option. I would like to allow the user to select multiple items, but I don't know how to prevent them from making a ...
5
votes
3answers
377 views

What are the exact differences between awk and cut with grep? [closed]

We know that we can get the second column of the line we want from a file using these two techniques: cat fileName | awk '/WORD/ { print $2 }' or cat fileName | grep WORD | cut -f 2 -d ' ' My ...
1
vote
2answers
38 views

grep a keyword from Mplayer output and send the rest to file

I am using mplayer. I want to send everything to a log file (/tmp/server.log), but I want the Volume output to be written to the terminal. I have seen that there is a way to split the output with tee, ...
1
vote
1answer
39 views

Using `tac` on zipped files

tac unzipped.log | grep -m1 pattern works perfectly fine but I am not able to use the tac command on zipped files. tac zipped.gz | zgrep -m1 pattern returns nothing. Is there anyway to use tac ...
3
votes
3answers
102 views

How can I get the first column of a 300GB txt file?

let me first explain my problem in detail. It's actually pretty simple. I have a huge .txt file, 300GB to be more preciese, and I would like to put all the distinct strings from the first column, that ...
2
votes
3answers
105 views

grep on a Java Method

Lets say I have a java class called DirectAction some of the methods in the class have the word "action" or "Action" What is the grep command to get the names of all the methods who have "Action" or ...
6
votes
10answers
522 views

Copy only Specific text of a file to another

I have a file abc.txt the contents are <classpathentry kind="src" path="Sources"/> <classpathentry kind="con" path="WOFramework/ERExtensions"/> <classpathentry kind="con" ...
0
votes
4answers
155 views

Search for a Value only in one column w.o using awk, sed, or perl

I have a file that looks like this : Marketing Ranjit Singh FULLEagles Dean Johnson Marketing Ken Whillans FULLEagles Karen Thompson Sales Peter RobertsonPARTGolden ...
1
vote
3answers
114 views

Returning only the portion of a line after a matching pattern (Unix)

I have a parent folder (abeps) which contains several sub folders (1,2,3....25) where output file is located, one in which - all are the same name (opt.out). In this files there is an unpredictable ...
1
vote
2answers
138 views

How to show specific lines from specific columns of a file

First off, I'm not allowed awk, sed or perl. For my assignment I was given a file of employee list: Marketing Ranjit Singh FULLEagles Dean Johnson Marketing Ken Whillans FULLEagles ...
4
votes
3answers
143 views

conditional coloring in grep

I have a simple bash script. One line of my script matches a "pattern" with grep and colors the match grep -i --color=always -- "$1" I need to modify it, so that it only colors the match, if the ...
5
votes
3answers
336 views

Recursive grep vs find / -type f -exec grep {} \; Which is more efficient/faster?

Which is more efficient for finding which files in an entire filesystem contain a string: recursive grep or find with grep in an exec statement? I assume find would be more efficient because you can ...
0
votes
1answer
83 views

Duplicate specific text in text file, using perl or grep

I need to duplicate part of a plain text file as follows: The text file consists of a sequence of "pages", of the form: <page [lots of lines of text] /page> <page [lots of ...
4
votes
1answer
75 views

Blank lines when executing “grep | xargs” in a “find -exec”

I'm trying to list all directories of a web server that are blocked by Apache via a .htaccess (containing deny from all). I've managed to get the list of blocking .htaccess but when I try to extract ...
1
vote
1answer
550 views

How to grep top most frequent error messages in a unix logfile

If I have a file example apache log file How to extract the top most frequent error messages in a unix log file with no timestamps the key is most frequent error message should come on top of the ...
3
votes
2answers
75 views

how to grep complex hierarcy?

I have a file as:- start apple 1 a 2 b 3 c start orange 4 a 5 b start mango 1 a start a/b/c 5 z end 4 b end 6 c end start banana 3 c end 4 d 5 e end I want the output as :- 1 apple/a 2 apple/b 3 ...
4
votes
6answers
5k views

Recursive search doesn't work for grep on solaris

On our Solaris server I'm finding that grep -r doesn't work, which is the usual way that I use grep. It seems that egrep has the same behavior. Given that I have no control over the machine, is there ...
2
votes
1answer
36 views

Globbing fails in zsh, but works in bash

I have an alias in bash, that I'm trying to port over to zsh. I thought it may have been the alias itself, but now it seems it's just the globbing. grep -irl --exclude=\*.{log,class,fuegoclass,dat}* ...
1
vote
7answers
696 views

Can grep be used for searching files with some string in their names?

I understand that grep can only be used for searching for files which contain a string in their content. Can it be used for searching for files with a string in their names? I read the manpage, and ...
2
votes
1answer
75 views

How to find text in files and only keep the respective matching lines using the terminal on OS X?

I am pretty new to the terminal and command lines, from what I have found out grep seems to be the right tool for search files for specific text strings. I have a folder with many huge text files and ...
6
votes
4answers
741 views

Why doesn't grep using pipe work here?

I have the following command: find / -name libGL.so.1 Which returns lots of lines with "Permission denied". I want to exclude such lines, so I added the following: find / -name libGL.so.1 | grep ...
2
votes
2answers
165 views

Grep log and get text between log delimiters

Is there a way to grep a log and find text between the log entry delimeters? Our log file separates the line entry with characters "-------" So when I search the text word I want all the lines before ...