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Top Forums UNIX for Beginners Questions & Answers Grep first n lines from each file Post 303046260 by MadeInGermany on Tuesday 28th of April 2020 12:08:46 PM
Old 04-28-2020
grep -l prints the file names so you can process them with xargs.
Code:
grep --include="*.org" --include="*.texi" -lir "Abstract" . | xargs head

But xargs has a problem with space characters in file names.
find -exec handles spaces well:
Code:
find . \( -name '*.org' -o -name '*.texi' \) -exec grep -iq "Abstract" {} \; -exec head {} +

grep -q suppresses output; the exit status decides on the following.
Probably all find versions cannot chain {} + queues so there is a need for a slower {} \;.
Many GNU utilities allow 0-byte terminated lines, so the following is fast and correct:
Code:
grep --include="*.org" --include="*.texi" -lirZ "Abstract" . | xargs -0 head

This User Gave Thanks to MadeInGermany For This Post:
 

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Mail::Mbox::MessageParser::Grep(3)			User Contributed Perl Documentation			Mail::Mbox::MessageParser::Grep(3)

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 v5.12.1 2009-08-09 Mail::Mbox::MessageParser::Grep(3)
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