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1. UNIX for Dummies Questions & Answers
There is a file name list_filenames.dat, this has all the list of all files I need to encrypt, I did not understand what the following syntax is doing:
grep -s "^$1" list_filenames.dat, when I manually run this command it just returns all the lines, what is the usage of this ? can someone... (4 Replies)
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2. Homework & Coursework Questions
Use and complete the template provided. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
I have to find all the files where the function sequentialInsert is called and the directory is ~cs252/Assignments/commandsAsst/project
2.... (2 Replies)
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3. AIX
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4. Shell Programming and Scripting
what is the grep command to get the second occurence of pattern in a file
or how to do with sed ? (1 Reply)
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5. Shell Programming and Scripting
Hi all,
I have a file resp_cde.ats which has values as:-
APPDIR=C:\Program Files\Cogny\cert
PUBSDIR=C:\Program Files\Cognoy\cert\documentation
TOURDIR=C:\Program Files\Cognoy\cert\tour
DATADIR=C:\Program Files\Cognoy\cert\data
Now I use the grep command in a shell script:-
x=`grep... (2 Replies)
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6. UNIX for Advanced & Expert Users
my file contains
xxabced.p dlksfad;
dflsdkjflkds flksdjflkdioewf
erfsdlkfjsdla;
dlkfjsd;lfkj msgdadf.p dslk kdjflksdjfl;asdfasdfjkljl
fdsf;jd ppuskldf.p
i want the output is
xxabced.p
msgdadf.p
ppuskldf.p
Can any one give the command? (1 Reply)
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8. UNIX for Dummies Questions & Answers
Hello,
I am trying to use grep to locate multiple uses of the same word in the same line. The word has to be 3+ char, upper or lower or both.
I tried this code
<code>
grep \({3,}\)*\1 i*
</code>
and i turned out zero results. Any ideas?
____________________________________________... (5 Replies)
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9. UNIX for Advanced & Expert Users
grep can filter the text which want to display, but if I want it do not show the text specific in grep, how to do? thk a lot! (2 Replies)
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10. UNIX for Dummies Questions & Answers
Hi,
I have one basic doubt, that using grep command frequently , will it have direct impact on the CPU load, pls clarify
for eg, if i run a non stop script containing while loop to grep some parameters, what will be the load in CPU..
thanks (3 Replies)
Discussion started by: vasikaran
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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)