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Expressions régulières,
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ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)


CentOS 2.1AS







mhlist − list information about MIME messages


mhlist [+folder] [msgs] [−file file]
[−part number]... [−type content]...
[−headers] [−noheaders] [−realsize] [−norealsize]
[−rcache policy] [−wcache policy] [−check] [−nocheck]
[−verbose] [−noverbose] [−version] [−help]


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

mhlist manipulates MIME (multi-media messages) as specified in RFC−2045 thru RFC−2049.

The ’−headers’ switch indicates that a one-line banner should be displayed above the listing.

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.

If the ’−verbose’ switch is present, then the listing will show any “extra” information that is present in the message, such as comments in the Content-Type 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’ and ’−type’ switches, you may limit the scope of this command to particular subparts (of a multipart content) and/or particular content types.

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, respectively. Note that the ’−part’ switch is effective for only 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.

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:






plain, enriched


mixed, alternative, digest, parallel


rfc822, partial, external-body


octet-stream, postscript


jpeg, gif, png





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/external-body and once for the content externally referenced.

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. ^$HOME/.mh_profile~^The user profile ^Path:~^To determine the user’s nmh directory ^Current−Folder:~^To find the default current folder mhbuild(1), mhshow(1), mhstore(1), sendfiles(1)
Multipurpose Internet Mail Extensions (MIME) Part One:
Format of Internet Message Bodies
Multipurpose Internet Mail Extensions (MIME) Part Two:
Media Types
Multipurpose Internet Mail Extensions (MIME) Part Three:
Message Header Extensions for Non-ASCII Text
Multipurpose Internet Mail Extensions (MIME) Part Four:
Registration Procedures
Multipurpose Internet Mail Extensions (MIME) Part Five:
Conformance Criteria and Examples
. ’+folder’ defaults to the current folder ’msgs’ defaults to cur ’−nocheck’ ’−headers’ ’−realsize’ ’−rcache ask’ ’−wcache ask’ ’−noverbose’ If a folder is given, it will become the current folder. The last message selected will become the current message.