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MHLIST(1)		    General Commands Manual		     MHLIST(1)

NAME
       mhlist -	list information about nmh MIME	messages

SYNOPSIS
       mhlist [-help] [-version] [+folder] [msgs] [-file file] [-part number]
	    ...	 [-type	content] ...  [-prefer content]	...  [-noprefer]
	    [-headers |	-noheaders] [-realsize | -norealsize] [-rcache policy]
	    [-wcache policy] [-check | -nocheck] [-changecur | -nochangecur]
	    [-verbose |	-noverbose] [-disposition | -nodisposition]

DESCRIPTION
       The mhlist command allows you to	list information (a table of contents,
       essentially) about the various parts of a collection of MIME (multi-me-
       dia) messages.

       mhlist  manipulates  MIME messages as specified in RFC 2045 to RFC 2049
       (See mhbuild(1)).

       The -headers switch indicates that a one-line  banner  should  be  dis-
       played above the	listing	(the default).

       The  -realsize  switch  tells mhlist to evaluate	the "native" (decoded)
       format of each content prior to listing.	  This	provides  an  accurate
       count  at  the expense of a small delay.	 In either case, sizes will be
       expressed using SI prefix abbreviations (K/M/G/T), which	are  based  on
       factors of 1000.

       If  the -verbose	switch is present, then	the listing will show any "ex-
       tra" information	that is	present	in the message,	such  as  comments  in
       the "Content-Type" header.

       If  the	-disposition switch is present,	then the listing will show any
       relevant	information from the "Content-Disposition" header.

       The option -file	file directs mhlist to use the specified file  as  the
       source  message,	 rather	 than a	message	from a folder.	If you specify
       this file as "-", then mhlist will accept the  source  message  on  the
       standard	 input.	  Note	that  the  file,  or input from	standard input
       should be a validly formatted message, just like	any other nmh message.
       It  should  not	be in mail drop	format (to convert a file in mail drop
       format to a folder of nmh messages, see inc(1)).

       By default, mhlist will list information	about the entire message  (all
       of  its	parts).	  By using the -part, -type, and -prefer switches, you
       may limit and reorder the set of	parts to be listed, based on part num-
       ber and/or content type.

       A part specification consists of	a series of numbers separated by dots.
       For example, in a multipart content containing three parts, these would
       be  named as 1, 2, and 3, respectively.	If part	2 was also a multipart
       content containing two parts, these would be named as 2.1 and 2.2,  re-
       spectively.   Note that the -part switch	is effective only for messages
       containing a multipart content.	If a message has some  other  kind  of
       content,	 or if the part	is itself another multipart content, the -part
       switch will not prevent the content from	being acted upon.

       The -type switch	can also be used to restrict (or, when	used  in  con-
       junction	 with  -part,  to further restrict) the	selection of parts ac-
       cording to content type.	 One or	more -type switches part will only se-
       lect  the  first	 match	from a multipart/alternative, even if there is
       more than one subpart that matches (one of) the given content type(s).

       Using either -part or -type switches alone will cause either to	select
       the  part(s)  they  match.   Using  them	 together will select only the
       part(s) matched by both (sets of) switches.  In other words, the	result
       is  the	intersection,  and  not	the union, of their separate match re-
       sults.

       A content specification consists	of a content type and a	subtype.   The
       initial	list  of "standard" content types and subtypes can be found in
       RFC 2046.

       A list of commonly used contents	is briefly reproduced here:

	    Type	 Subtypes
	    ----	 --------
	    text	 plain,	enriched
	    multipart	 mixed,	alternative, digest, parallel
	    message	 rfc822, partial, external-body
	    application	 octet-stream, postscript
	    image	 jpeg, gif, png
	    audio	 basic
	    video	 mpeg

       A legal MIME message must contain a subtype specification.

       To specify a content, regardless	of its subtype,	just use the  name  of
       the  content,  e.g.,  "audio".  To specify a specific subtype, separate
       the two with a slash, e.g., "audio/basic".  Note	that regardless	of the
       values  given  to the -type switch, a multipart content (of any subtype
       listed above) is	always acted upon.  Further note  that	if  the	 -type
       switch  is  used, and it	is desirable to	act on a message/external-body
       content,	then the -type switch must be used twice: once for message/ex-
       ternal-body and once for	the content externally referenced.

       By default, the parts of	a multipart/alternative	part are listed	in the
       reverse order of	their placement	in the message.	 The  listing,	there-
       fore,  is  in  decreasing  order	of preference, as defined in RFC 2046.
       The -prefer switch can be used (one or more times, in order of  ascend-
       ing preference) to let MH know which content types from a multipart/al-
       ternative MIME part are preferred by the	user, in order to override the
       default preference order.  Thus,	when viewed by mhlist, the ordering of
       multipart/alternative parts will	appear to change when invoked with  or
       without various -prefer switches.  The -noprefer	switch will cancel any
       previous	-prefer	switches.  The	-prefer	 and  -noprefer	 switches  are
       functionally most important for mhshow, but are also implemented	in mh-
       list and	mhstore	to make	common	part  numbering	 possible  across  all
       three programs.

   Checking the	Contents
       The  -check  switch tells mhlist	to check each content for an integrity
       checksum.  If a content has such	a checksum (specified as a Content-MD5
       header  field), then mhlist will	attempt	to verify the integrity	of the
       content.

FILES
       $HOME/.mh_profile		    The	user profile

PROFILE	COMPONENTS
       Path:		    To determine the user's nmh	directory
       Current-Folder:	    To find the	default	current	folder

SEE ALSO
       mhbuild(1), mhshow(1), mhstore(1)

DEFAULTS
       `+folder' defaults to the current folder
       `msgs' defaults to cur
       `-nocheck'
       `-headers'
       `-realsize'
       `-rcache	ask'
       `-wcache	ask'
       `-changecur'
       `-noverbose'
       `-nodisposition'

CONTEXT
       If a folder is given, it	will become the	current	folder.	 The last mes-
       sage  selected will become the current message, unless the -nochangecur
       option is specified.

nmh-1.7.1			  2015-02-06			     MHLIST(1)

NAME | SYNOPSIS | DESCRIPTION | FILES | PROFILE COMPONENTS | SEE ALSO | DEFAULTS | CONTEXT

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