Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Grep or cat The Whole Directory PROBLEMS :( Post 302934010 by Scrutinizer on Wednesday 4th of February 2015 01:11:41 AM
Old 02-04-2015
With the first approach try:
Code:
find .location -name "*.txt" | while read file; do grep -l '\[' "$file" ; done > grep.txt

or with the second approach ( which which I would expect to be faster )
Code:
find .location -name "*.txt" -exec grep -l '\[' {} + > grep.txt



--
You could also try and see if grep -Fl '[' rather than grep -l '\[' is any faster

Last edited by Scrutinizer; 02-04-2015 at 02:21 AM..
This User Gave Thanks to Scrutinizer For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

variable= 'cat file|wc -l' String problems

Hi, does anybody knows about wc -l, how to transform it inot a just number? this script ALWAYS executes the command3!!, However, the value of BMU_RUNNING is 1 case $BMU_RUNNING in *0) command1 ;; *1) command 2;; *)command 3;; esac The... (3 Replies)
Discussion started by: Santiago
3 Replies

2. UNIX for Advanced & Expert Users

cat and grep not working

I am trying to cat a file and then grep that file for a number. I can do it fine on other files but this particular file will not do anything. I tried running it on an older file from the same device but it is just not working. The file is nothing more than a flat file on a unix box. Here is just a... (3 Replies)
Discussion started by: jphess
3 Replies

3. Shell Programming and Scripting

cat /etc/passwd and grep -v on /etc/shells

Hi All, I'd like to do this cat /etc/passwd and grep -v on the /etc/shells list I'd like to find all shell that doesn't exist on the /etc/passwd. Is there an easy way without doing a egrep -v "/bin/sh|/bin/bash................"? How do I use a file /etc/shells as my list for... (4 Replies)
Discussion started by: itik
4 Replies

4. Shell Programming and Scripting

cat -n and grep

I am not sure if using cat -n is the most efficient way to split a file into multiple files, one file per line in the source file. I thought using cat -n would make it easy to process the file because it produces an output that numbers each line that I could then grep for with the regex "^ *$i".... (3 Replies)
Discussion started by: kapu
3 Replies

5. UNIX for Dummies Questions & Answers

cat a list of directory paths only to a file

Hi! I would like to funnel a series of directories and subdirectories into a text file. This is the output I would like to see from a find command: /mypath/ABC_01/VISIT_01 /mypath/ABC_01/VISIT_02 /mypath/ABC_01/VISIT_03 /mypath/ABC_02/VISIT_01 /mypath/ABC_03/VISIT_01 I've tried: find... (2 Replies)
Discussion started by: goodbenito
2 Replies

6. Shell Programming and Scripting

grep or cat using sed

Is there a way using grep or cat a file to create a new file based on whether the first 9 positions of each record is less than 399999999? This is a fixed file format. (3 Replies)
Discussion started by: ski
3 Replies

7. Shell Programming and Scripting

Problems on cat and substring replacement, shell

Hi I'm new in the Shell world, and I've been trying the whole day to get my script to work. I'm under Ubuntu 10.04. Let me explain: I want to list all the files matching some regex in a directory, and then make some some string replacement on the name of the files, and then a cat on the... (2 Replies)
Discussion started by: albh
2 Replies

8. UNIX for Dummies Questions & Answers

Grep and cat combined

Hello, i need to search one word (snp1) from many files and copy the content of the columns of this word in new file. example: file 1: SNP BP CHR P snp1 1 3 0.01 snp2 2 2 0.05 . . file 2: SNP BP CHR P snp1 1 3 0.06 snp2 2 2 0.3 output... (6 Replies)
Discussion started by: biopsy
6 Replies

9. Shell Programming and Scripting

Problems with using grep to make backups to a different directory

I am trying to program a script that is using grep to find lines in a file in my home directory, and then use a pipe command to copy what is shown into different files in a different directory to create backup files. When I run it, though, it only creates a copy of the file that grep was going... (7 Replies)
Discussion started by: sammythesp3rmy
7 Replies

10. Shell Programming and Scripting

Replace cat and grep with <

Hello someone told me to use OS=`awk '{print int($3)}' < /etc/redhat-release` instead of OS=cat /etc/redhat-release | `awk '{print int($3)}'` any idea for the reason ? (5 Replies)
Discussion started by: nimafire
5 Replies
Mail::Mbox::MessageParser::Grep(3pm)			User Contributed Perl Documentation		      Mail::Mbox::MessageParser::Grep(3pm)

NAME
Mail::Mbox::MessageParser::Grep - A GNU grep-based mbox folder reader SYNOPSIS
#!/usr/bin/perl use Mail::Mbox::MessageParser; my $filename = 'mail/saved-mail'; my $filehandle = new FileHandle($filename); my $folder_reader = new Mail::Mbox::MessageParser( { 'file_name' => $filename, 'file_handle' => $filehandle, 'enable_grep' => 1, } ); die $folder_reader unless ref $folder_reader; # Any newlines or such before the start of the first email my $prologue = $folder_reader->prologue; print $prologue; # This is the main loop. It's executed once for each email while(!$folder_reader->end_of_file()); { my $email = $folder_reader->read_next_email(); print $email; } DESCRIPTION
This module implements a GNU grep-based mbox folder reader. It can only be used when GNU grep is installed on the system. Users must not instantiate this class directly--use Mail::Mbox::MessageParser instead. The base MessageParser module will automatically manage the use of grep and non-grep implementations. METHODS AND FUNCTIONS The following methods and functions are specific to the Mail::Mbox::MessageParser::Grep package. For additional inherited ones, see the Mail::Mbox::MessageParser documentation. $ref = new( { 'file_name' => <mailbox file name>, 'file_handle' => <mailbox file handle> }); <file_name> - The full filename of the mailbox <file_handle> - An opened file handle for the mailbox The constructor for the class takes two parameters. The file_name parameter is the filename of the mailbox. The file_handle argument is the opened file handle to the mailbox. Returns a reference to a Mail::Mbox::MessageParser object, or a string describing the error. BUGS
No known bugs. Contact david@coppit.org for bug reports and suggestions. AUTHOR
David Coppit <david@coppit.org>. LICENSE
This software is distributed under the terms of the GPL. See the file "LICENSE" for more information. HISTORY
This code was originally part of the grepmail distribution. See http://grepmail.sf.net/ for previous versions of grepmail which included early versions of this code. SEE ALSO
Mail::Mbox::MessageParser perl v5.10.1 2009-08-09 Mail::Mbox::MessageParser::Grep(3pm)
All times are GMT -4. The time now is 09:05 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy