08-06-2009
Merging of files with different headers to make combined headers file
Hi ,
I have a typical situation. I have 4 files and with different headers (number of headers is varible ).
I need to make such a merged file which will have headers combined from all files (comman coluns should appear once only).
For example -
File 1
H1|H2|H3|H4
11|12|13|14
21|22|23|23
File 2
H3|H5|H6
31|32|33
41|42|43
Merged file of these two will be -
H1|H2|H3|H4|H5|H6
11|12|13|14|NA||NA
21|22|23|23|NA|NA
NA|NA|31|NA|32|33
NA|NA|41|NA|42|43
Please help me for the same.
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LEARN ABOUT DEBIAN
courriel::headers
Courriel::Headers(3pm) User Contributed Perl Documentation Courriel::Headers(3pm)
NAME
Courriel::Headers - The headers for an email part
VERSION
version 0.29
SYNOPSIS
my $email = Courriel->parse( text => ... );
my $headers = $email->headers;
print "$_
" for $headers->get('Received');
DESCRIPTION
This class represents the headers of an email.
Any sub part of an email can have its own headers, so every part has an associated object representing its headers. This class makes no
distinction between top-level headers and headers for a sub part.
Each individual header name/value pair is represented internally by a Courriel::Header object. Some headers have their own special
subclass. These are:
o Content-Type
This is stored as a Courriel::Header::ContentType object.
o Content-Disposition
This is stored as a Courriel::Header::Disposition object.
API
This class supports the following methods:
Courriel::Headers->parse( ... )
This method creates a new object by parsing a string. It accepts the following parameters:
o text
The text to parse. This can either be a plain scalar or a reference to a scalar. If you pass a reference, the underlying scalar may be
modified.
o line_sep
The line separator. This default to a "
", but you can change it if necessary. Note that this only affects parsing, header objects
are always output with RFC-compliant line endings.
Header parsing unfolds folded headers, and decodes any MIME-encoded values as described in RFC 2047. Parsing also decodes header attributes
encoded as described in RFC 2231.
Courriel::Headers->new( headers => [ ... ] )
This method creates a new object. It accepts one parameter, "headers", which should be an array reference of header names and values.
A given header key can appear multiple times.
This object does not (yet, perhaps) enforce RFC restrictions on repetition of certain headers.
Header order is preserved, per RFC 5322.
$headers->get($name)
Given a header name, this returns a list of the Courriel::Header objects found for the header. Each occurrence of the header is returned as
a separate object.
$headers->get_values($name)
Given a header name, this returns a list of the string values found for the header. Each occurrence of the header is returned as a separate
string.
$headers->add( $name => $value )
Given a header name and value, this adds the headers to the object. If any of the headers already have values in the object, then new
values are added after the existing values, rather than at the end of headers.
The value can be provided as a string or a Courriel::Header object.
$headers->unshift( $name => $value )
This is like "add()", but this pushes the headers onto the front of the internal headers array. This is useful if you are adding "Received"
headers, which per RFC 5322, should always be added at the top of the headers.
The value can be provided as a string or a Courriel::Header object.
$headers->remove($name)
Given a header name, this removes all instances of that header from the object.
$headers->replace( $name => $value )
A shortcut for calling "remove()" and "add()".
The value can be provided as a string or a Courriel::Header object.
$headers->as_string( skip => ...., charset => ... )
This returns a string representing the headers in the object. The values will be folded and/or MIME-encoded as needed.
The "skip" parameter should be an array reference containing the name of headers that should be skipped. This parameter is optional, and
the default is to include all headers.
The "charset" parameter specifies what character set to use for MIME-encoding non-ASCII values. This defaults to "utf8". The charset name
must be one recognized by the Encode module.
MIME encoding is always done using the "B" (Base64) encoding, never the "Q" encoding.
$headers->stream_to( output => $output, skip => ...., charset => ... )
This method will send the stringified headers to the specified output.
See the "as_string()" method for documentation on the "skip" and "charset" parameters.
ROLES
This class does the "Courriel::Role::Streams" role.
AUTHOR
Dave Rolsky <autarch@urth.org>
COPYRIGHT AND LICENSE
This software is Copyright (c) 2012 by Dave Rolsky.
This is free software, licensed under:
The Artistic License 2.0 (GPL Compatible)
perl v5.14.2 2012-03-07 Courriel::Headers(3pm)