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Mail::Header(3)  User Contributed Perl Documentation Mail::Header(3)

       Mail::Header - manipulate mail RFC822 compliant headers

           use Mail::Header;

           $head = new Mail::Header;
           $head = new Mail::Header \*STDIN;
           $head = new Mail::Header [<>], Modify => 0;

       This package provides a class object which can be used for
       reading, creating, manipulating and writing RFC822 compliant

       new ( [ ARG ], [ OPTIONS ] )
           "ARG" may be either a file descriptor (reference to a
           GLOB) or a reference to an array. If given the new object
           will be initialized with headers either from the array of
           read from the file descriptor.

           "OPTIONS" is a list of options given in the form of key-
           value pairs, just like a hash table. Valid options are

           Modify  If this value is true then the headers will be
                   re-formatted, otherwise the format of the header
                   lines will remain unchanged.

                   This option specifies what to do when a header in
                   the form `From ' is encountered. Valid values are
                   "IGNORE" - ignore and discard the header, "ERROR"
                   - invoke an error (call die), "COERCE" - rename
                   them as Mail-From and "KEEP" - keep them.

                   The default length of line to be used when fold‐
                   ing header lines

       modify ( [ VALUE ] )
           If "VALUE" is false then "Mail::Header" will not do any
           automatic reformatting of the headers, other than to
           ensure that the line starts with the tags given.

       mail_from ( OPTION )
           "OPTION" specifies what to do when a `From ' line is
           encountered.  Valid values are "IGNORE" - ignore and dis‐
           card the header, "ERROR" - invoke an error (call die),
           "COERCE" - rename them as Mail-From and "KEEP" - keep

       fold ( [ LENGTH ] )
           Fold the header. If "LENGTH" is not given then
           "Mail::Header" uses the following rules to determine what
           length to fold a line.

           The fold length for the tag that is begin processed

           The default fold length for the tag that is being pro‐

           The default fold length for the object

       extract ( ARRAY_REF )
           Extract a header from the given array. "extract" will
           modify this array.  Returns the object that the method
           was called on.

       read ( FD )
           Read a header from the given file descriptor.

       empty ()
           Empty the "Mail::Header" object of all lines.

       header ( [ ARRAY_REF ] )
           "header" does multiple operations. First it will extract
           a header from the array, if given. It will the reformat
           the header, if reformatting is permitted, and finally
           return a reference to an array which contains the header
           in a printable form.

       header_hashref ( [ HASH_REF ] )
           As "header", but it will eventually set headers from a
           hash reference, and it will return the headers as a hash

           The values in the hash might either be a scalar or an
           array reference, as an example:

               $hashref->{From}='Tobias Brox <>';
               $hashref->{To}=['you@somewhere', 'me@localhost'];

       add ( TAG, LINE [, INDEX ] )
           Add a new line to the header. If "TAG" is undef the the
           tag will be extracted from the beginning of the given
           line. If "INDEX" is given the new line will be inserted
           into the header at the given point, otherwise the new
           line will be appended to the end of the header.

       replace ( TAG, LINE [, INDEX ] )
           Replace a line in the header.  If "TAG" is undef the the
           tag will be extracted from the beginning of the given
           line. If "INDEX" is given the new line will replace the
           Nth instance of that tag, otherwise the first instance of
           the tag is replaced. If the tag does not appear in the
           header then a new line will be appended to the header.

       combine ( TAG [, WITH ] )
           Combine all instances of "TAG" into one. The lines will
           be joined togther with "WITH", or a single space if not
           given. The new item will be positioned in the header
           where the first instance was, all other instances of
           <TAG> will be removed.

       get ( TAG [, INDEX ] )
           Get the text from a line. If "INDEX" is given then the
           text of the Nth instance will be returned. If it is not
           given the return value depends on the context in which
           "get" was called. In an array context a list of all the
           text from all the instances of "TAG" will be returned. In
           a scalar context the text for the first instance will be

           The lines are unfolded, but still terminated with a new-
           line (see "chomp")

       delete ( TAG [, INDEX ] )
           Delete a tag from the header. If "INDEX" id given then
           the Nth instance of the tag will be removed. If "INDEX"
           is not given all instances of tag will be removed.

       count ( TAG )
           Returns the number of times the given atg appears in the

       print ( [ FD ] )
           Print the header to the given file descriptor, or "STD‐
           OUT" if no file descriptor is given.

       as_string ()
           Returns the header as a single string.

       fold_length ( [ TAG ], [ LENGTH ] )
           Set the default fold length for all tags or just one.
           With no arguments the default fold length is returned.
           With two arguments it sets the fold length for the given
           tag and returns the previous value. If only "LENGTH" is
           given it sets the default fold length for the current

           In the two argument form "fold_length" may be called as a
           static method, setting default fold lengths for tags that
           will be used by all "Mail::Header" objects. See the
           "fold" method for a description on how "Mail::Header"
           uses these values.

       tags ()
           Retruns an array of all the tags that exist in the
           header. Each tag will only appear in the list once. The
           order of the tags is not specified.

       dup ()
           Create a duplicate of the current object.

       cleanup ()
           Remove any header line that, other than the tag, only
           contains whitespace

       unfold ( [ TAG ] )
           Unfold all instances of the given tag so that they do not
           spread across multiple lines. IF "TAG" is not given then
           all lines are unfolded.

           The unfolding process is wrong but (for compatibility
           reasons) will not be repaired: only one blank at the
           start of the line should be removed, not all of them.

       Graham Barr.  Maintained by Mark Overmeer <mailtools@over‐>

       Copyright (c) 2002-2003 Mark Overmeer, 1995-2001 Graham Barr.
       All rights reserved. This program is free software; you can
       redistribute it and/or modify it under the same terms as Perl

perl v5.8.8                  2007-05-11              Mail::Header(3)
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