UPDATE-MIME(8) Update MIME Programs UPDATE-MIME(8)
update-mime - create or update MIME information
update-mime [no parameters]
update-mime updates the /etc/mailcap file to reflect mime information
changed by a Debian package during installation or removal.
The order of entries in the /etc/mailcap file can be altered by editing
the /etc/mailcap.order file. Please see the mailcap.order(5) man page
for more information.
To create entries in the mailcap file, packages need to create a file
in the /usr/lib/mime/packages directory. In this file goes the verba
tim desired mailcap entries. In addition to the standard mailcap
options (described below) is a new priority option. Specifying this
will provide for simple ranking of programs within a given mime type.
An animation viewer, for example, may be able to display a static pic
ture, but probably wouldnt be the best choice and so would give an
option like "priority=2". Priorities range from 0 to 9, with 0 being
the lowest and 9 being the highest. If the priority option is omitted,
a value of 5 is used.
The following are standard options that can be specified in the mailcap
entry. Options are separated by semicolons (;) but must all be on the
same line. Each line should look like:
mime/type; viewer; option; another=val; etc; priority=5
Mime types of the form "class/*" and even "*/*" are now acceptable
(they were previously disallowed). When using "class/*", it is proba
bly a good idea to add a "priority=[1-4]" option so specific rules
using the default priority will get chosen first. If using "*/*",
though, you probably want to add a "priority=0" option to make that
rule a "last resort".
Specifies the program to run to view a file of the given con
tent-type. This option setting connot be omitted. An implicit
"view=" can be considered before it. When writing an entry that
has no viewer, use a value of false in this space.
The "compose" command may be used to specify a program that can
be used to compose a new body or body part in the given format.
Its intended use is to support mail composing agents that sup
port the composition of multiple types of mail using external
composing agents. The result of the composing program may be
data that is not yet suitable for mail transport -- that is, a
Content-Transfer-Encoding may need to be applied to the data.
The "composetyped" command is similar to "compose", but is to be
used when the composing program needs to specify the Content-
type header field to be applied to the composed data. The "com
pose" option is simpler, and is preferred for use with existing
(non-mail-oriented) programs for composing data in a given
format. The "composetyped" option is necessary when the Con
tent-type information must include auxiliary parameters, and the
composition program must then know enough about mail formats to
produce output that includes the mail type information.
The "edit" command may be used to specify a program that can be
used to edit a body or body part in the given format. In many
cases, it may be identical in content to the "compose" command.
The "print" command may be used to specify a program that can be
used to print a message or body part in the given format.
These options are modifiers to all the commands specified on the com
The "test" option may be used to test some external condition
(e.g., the machine architecture, or the window system in use) to
determine whether or not the mailcap line applies. It specifies
a program to be run to test some condition. If the test fails,
a subsequent mailcap entry will be sought. Multiple test
options are not permitted -- since a test can call a program, it
can already be arbitrarily complex.
Note: When testing for X by looking at the DISPLAY environment
variable, please use one of:
test=test -z "$DISPLAY" (no X)
or test=test -n "$DISPLAY" (have X)
Many programs recognize these strings and optimize for them.
The "needsterminal" option, if given, indicates that the com
mands must be run on an interactive terminal. This is needed to
inform window-oriented user agents that an interactive terminal
is needed. (The decision is not left exclusively to the command
because in some circumstances it may not be possible for such
programs to tell whether or not they are on interactive termi
nals.) The needsterminal command applies to the view, compose
and edit commands, if they exist. Note that this is NOT a test
-- it is a requirement for the environment in which the program
will be executed, and will typically cause the creation of a
terminal window when not executed on either a real terminal or a
The "copiousoutput" option, if given, indicates that the output
from the view-command will be an extended stream of output and
is to be interpreted as advice to the UA (User Agent mail-read
ing program) that the output should be either paged or made
scrollable. Note that it is probably a mistake if needsterminal
and copiousoutput are both specified.
These options provide additional information about the given content-
The "description" option simply provides a textual description
that describes the type of data, to be used optionally by mail
readers that wish to describe the data before offering to dis
The "textualnewlines" option, if given, indicates that this type
of data is line-oriented and that, if encoded in a binary for
mat, all newlines should be converted to canonical form (CRLF)
before encoding, and will be in that form after decoding. In
general, this is needed only if there is line-oriented data of
some type other than text/* or non-line-oriented data that is a
subtype of text.
The "x11-bitmap" option names a file, in X11 bitmap (xbm) for
mat, which points to an appropriate icon to be used to visually
denote the presence of this kind of data.
The "nametemplate" option gives a file name format, in which %s
will be replaced by a short unique string to give the name of
the temporary file to be passed to the viewing command. This is
only expected to be relevant in environments where filename
extensions are meaningful, e.g., one could specify that a GIF
file being passed to a gif viewer should have a name ending in
".gif" by using "nametemplate=%s.gif".
Packages that wish to provide MIME access to themselves should not
depend on, recommend, or suggest mime-support. Instead, they should
just put something like the following in the postinst and postrm
if [ -x /usr/sbin/update-mime ]; then
mailcap.order(5), RFC-2046, RFC-1524
update-mime was written by Brian White
update-mime is in the public domain (the only true "free").
Debian Project 16th Jul 2006 UPDATE-MIME(8)