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

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2
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2answers
80 views

help with truncate \ find

This command won't work: $ truncate -s 0 $(find . -size +1c type -f -exec grep -LwE 'keyword1|keyword2|keyword3' {} +) "find: paths must precede expression: type Usage: find [-H] [-L] [-P] [-Olevel] ...
2
votes
4answers
376 views

Using wget and grep to download HTML pages and filter by keywords

KEYWORDS=("dolphins" "fish" "dogs" "cats" "iguanas") IFS=$'\n' find . -type f -size +1c ! -exec grep -qF "${KEYWORDS[*]}" {} \; -exec truncate -s 0 -f {} \; If a file is over 1 byte, search for ...
3
votes
2answers
727 views

test if return true if grep on output has string in one line

I just want to return true or false if a service is running. Here is where I'm at, not first try or last but current at writing: service iptables status | grep -qi "not running" The sdtout for ...
5
votes
3answers
139 views

Mac OS X find/grep generating “unknown --devices option”

I am entering a command I have done often with Linux, Unix perfectly fine but with Apple Mac OS X 10.8 (and probably before) I get a grep: unknown --devices option when I attempt to run the following ...
5
votes
5answers
336 views

Number of files not containing given string

I read the question about how to find out the number of files that contain a certain string. This is possible with grep -l "string" * | wc -l. Is it possible to invert this, finding the number of ...
2
votes
4answers
115 views

Print the string between two parentheses

I have file with these lines G8 = P(G1,G3) G9 = P(G3,G4) G12 = P(G2,G9) G15 = P(G9,G5) G16 = P(G8,G12) G17 = P(G12,G15) I need the output as G1,G3 G3,G4 ..... How can I do it with sed/grep ...
3
votes
1answer
130 views

Grep perl syntax and copyright character

I am trying to pull some links out of text that I downloaded of off the internet using grep, but keep getting "Aborted (core dumped)". When using grep I tend to use -P as I prefer to use perl syntax ...
1
vote
2answers
122 views

How to bury an invisible mark into lines of text?

How can I bury an invisible mark into random lines of text? Such a mark has to be there, though it will be invisible to someone reading that text printed out on the console. I want to identify those ...
-5
votes
1answer
93 views

Copy content of an file “passwd” to an file userlist.txt [closed]

The problem is that the file passwd hasn't got any tag like .txt or so. So I can't copy the content by passed > userlist.txt.
2
votes
2answers
76 views

Pipeline with grep and find prints numbers infront of result

Am using the following "find" command to extract some files, find /lag/cnnf/ -maxdepth 3 -newer ./start ! -newer ./end | grep -nri abc | egrep '([^0-9]45[^0-9])' | grep -nri "db.tar.gz" >> ...
1
vote
1answer
101 views

Grep for single and double digit

i have path name as below, abc4/2012 abc4/2013 abc45/2014 abc45/2014 When i grep for 45 it is showing one instance of 4 and for 4 its showing all 45. i need to grep both single digit and double ...
0
votes
3answers
123 views

Ignore lines containing a capital letter

Why does the following command still return some lines containing a capital letter? aspell dump master | grep ozz | grep -v '[^A-Z]'
16
votes
9answers
970 views

Grep lines but let the first line through [duplicate]

Consider the following output from df. Filesystem Size Used Avail Use% Mounted on /dev/sda1 23G 6.1G 16G 29% / udev 10M 0 10M 0% /dev tmpfs 397M 420K ...
3
votes
3answers
277 views

Grep command in shell script

I've been writing a shell script which should make grep command outputs for further use. However when I pass a variable containing ~/.../multiple_dir/* to grep as input I get empty output file. ...
4
votes
1answer
260 views

Grep multiple pattern negative match

So I have a bunch of Apache logs with using the standard log format. I want to get all the log lines that did not come from a web crawler. So lets say I have a file robot_patterns with entries like ...
4
votes
4answers
2k views

How can I suppress output from grep, so that it only returns the exit status?

I have the grep command. I'm searching for a keyword from a file, but I don't want to display the match. I just want to know the exit status of the grep.
4
votes
1answer
1k views

Why does grep sometimes show the file name, sometimes not?

Can somebody please explain to me why I don't get the full path in example 1? example 1 - returning found line grep MODIFY /opt/releases/packages/cr_c_cr6/sas/dbms/*/*; outcome: MODIFY example 2 ...
2
votes
1answer
50 views

Matching two different lines that are at least N lines distant from each other

I would like to match files that contain try (in one line) and consecutive catch (in another line) at least N lines later (to find very long try-catches and try to get rid of them). I mean, the first ...
24
votes
3answers
540 views

Multicolored Grep

I'm trying to get each grep command to highlight it's results in a different color. I can do it manually with a line like this: ls -l GREP_COLORS='mt=01;32' grep c | GREP_COLORS='mt=01;31' grep o | ...
1
vote
1answer
76 views

Help understanding an egrep expression

I stumbled across the following egrep expression: egrep '^([^aieou]*[aieou]){5,7}[^aieou]*$' /usr/share/dict/words on this page: http://matt.might.net/articles/sculpting-text The expression is ...
0
votes
1answer
94 views

What does Grep */* mean in KSH

In ksh, what does grep */*[myPattern] mean?
2
votes
2answers
1k views

grep: regex only for match anything between parenthesis

How do I match word only between parenthesis Input : this is (test.com) Desire Output : test.com
1
vote
1answer
235 views

Grep pattern in ksh [duplicate]

a small question regarding grep. I'm doing : find . -type d And I have three directories : ./backup-2013-11-27 ./backup-2013-11-26 ./backup-2013-11-28 If I only want to retrieve the one from ...
3
votes
2answers
511 views

“grep: Unmatched [” error when using regex

I'm trying to find a pattern similar to this: tail -n 100000 gateway.log | grep -B10 -A10 'Nov 22 11:13:56 Received Packet from [10.50.98.68' Where "11:13:56" could be any time. This is what I ...
3
votes
2answers
41 views

Extracting just a single group from a regular expression

I am trying to get a list of numbers from some hacked-together log files using zgrep. So, I am using: zgrep -ie "total time: .* ms" * This returns the whole line that I care about. I'd just like ...
6
votes
2answers
203 views

Why two almost idetical grep commands return different output: w/o and with filename

I have 2 almost identical greps: [Alex@localhost tmp]$ grep /bin/bash /etc/passwd root:x:0:0:root:/root:/bin/bash AlexL:x:500:500::/home/AlexL:/bin/bash user1:x:501:501:user1 ...
8
votes
6answers
2k views

How to pipe the result of a grep search into a new vi file

I'm using grep -e Peugeot -e PeuGeot carlist.txt to search through carlist.txt and pull out some items and I presumed that grep -e Peugeot -e PeuGeot carlist.txt | vi would pipe it through for me but ...
0
votes
2answers
144 views

Count occurrences of line in multiple files

I have log files that I need to grep and count the number of occurrences of a specific line. Issue is that I must start at a specific line of the first file and only count occurrences after that ...
2
votes
1answer
760 views

Search for a String inside all files inside a war

Where I work someone had Java project and used Eclipse to export that project into a .war package. Now I need to search for a string inside all the files that make that .war package. I know that a ...
5
votes
3answers
137 views

Robustly segmenting a csv file containing noisy data

Say I have a csv file with these columns: timestamp,cpu,memory An example of the shape of the actual data would be this chart: Having the data visualized in this way, it's easy for the human eye ...
5
votes
5answers
435 views

Pattern matching across multiple lines

What is a quick and easy way to validate if the pattern "301 domaname.com 200" is present within BASH when spread across multiple lines of output? I was using something like the following: awk ...
1
vote
2answers
54 views

Replace “-from” with “this” in the begining of line

I want to replace "-from" with "this" in the begining of line. This should happen when that line has 'R' at the end and line above it has "D" at the end. For example for the block shown below: ...
1
vote
1answer
158 views

Grep Wvdial output while it is running

I want to grep the output from wvdial while wvdial is running. Actually I want to fire a task when the modem is connected. I want to do this in the following way: grep string "IP address", if it is ...
1
vote
3answers
1k views

Count tabs per line in text file with utils

I have a tab-tabulated file. I would like to check if every line has the same number of tabs. For first step, I'd like to print the number of tabs for each individual line. I've tried grep -o '\t' ...
1
vote
2answers
148 views

Count entries for each directory in tree

Say I have the following tree: root: d foo d bar /foo: d A - tmp.txt /bar: d B - tmp2.txt /foo/A: - tmp3.txt /bar/B: d = directory and - = file I need to answer the following question: which ...
1
vote
1answer
173 views

grep block of lines

I want to grep every block of lines that has starting line with "CK \" at the end of line and ending line that has "D \" at the end of line, I can use sed/awk/grep etc. So far i have tried following ...
5
votes
1answer
256 views

Find all lines between a line matching a pattern and a line matching another pattern

i want to start grepping from the lines that has "CK" at the end of line and stop grepping when the line has "D" at the end. I tried grep "$CK" "$D" file..txt , but it didnt work. Input: kkkkkkkkkkk ...
4
votes
4answers
317 views

How can I grep for a string containing regex metacharacters like $ and '?

I want to search all files in the current directory and below for the substring $form['#node']. So, I have tried, initially: grep -R "\$form\[\\\\'" . and grep -R "\$form\[\'" . But it returns no ...
2
votes
6answers
608 views

Remove lines that do not start with a pattern from a given set of patterns

I have a file that contains data like this: report aaaaaaaa - .. -th bbbbbbbbb -to ccccccccc .. --. Question: I want to remove any line that does not start with following strings : report ...
2
votes
1answer
86 views

replace text after match

aaaaaaaaa bbbbbbbbb -th ccccccccc_RD \ DDDDDDDD FFFFFFFF -th GGGGGGG_RD \ using sed/grep/awk etc, In the above text, if a line ends with "RD \" , replace "-th" with "-to" at the ...
1
vote
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 ...
3
votes
1answer
401 views

grep on line before the match plus the match

zzzzzzzzz aaaaaaaaa bbbbbbbbb & ccccccccc & ddddddddd hhhhhhhhh eeeeeeeee fffffffff & ggggggggg & in the above line, what i want is to grep/sed/awk (any method is fine) line that ...
2
votes
1answer
109 views

Grep ^ and $ at the same time

I'm, trying to use grep with a ^ and $ at the same time but for some reason that does not work. If I type grep '^s.*e' german.dic I get a lots of words starting with s and having an e somewhere. A ...
1
vote
2answers
104 views

Meaning of the following linux commands

cat "$1" > /tmp/file.$$ 2>/tmp/file0.$$ grep "*" /tmp/file.$$ >/tmp/file0.$$ I understood that in the cat command, if an error occurs, the error will be shown in file0.$$ and if it ...
22
votes
5answers
2k views

Pipe to multiple files in the shell

I have an application which will produce a large amount of data which I do not wish to store onto the disk. The application mostly outputs data which I do not wish to use, but a set of useful ...
1
vote
1answer
547 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 ...
0
votes
1answer
728 views

Getting a date format with grep

I've looked at similar questions and tried most suggestions, but none of them got me anywhere, even though i have a fairly simple task I think :S. I'm fairly new to this whole thing, so I've run out ...
0
votes
0answers
28 views

How to use grep command to find the matching pattern and some more characters? [duplicate]

I have a compressed JS code and I want to find a pattern, but since the file is compresses, it has only a line, and the match pattern is all the file. The output is too much large. grep -r ...
8
votes
6answers
367 views

How to get multiple lines out of a file by a regex?

How to get multiple lines out of a file by a regex? I often would like to get multiple lines / modify multiple lines by a regex. A example case: I am trying to read part of an XML/SGML file (they ...
4
votes
5answers
307 views

Multi-line grep beween two tags, only show the last match

I'm having a program that intermingles data segments into log output: log message log message ----BEGIN INLINE DATA---- data data data -----END INLINE DATA----- log messge I'm looking for something ...