#+TITLE: MU EXTRACT
#+MAN_CLASS_OPTIONS: :section-id "@SECTION_ID@" :date "@MAN_DATE@"
#+include: macros.inc

* NAME

mu-extract - display and save message parts
(attachments), and open them with other tools.

* SYNOPSIS

*mu* [​_COMMON-OPTIONS_​] *extract* [​_OPTIONS_​] [​_FILE_​]

*mu* [​_COMMON-OPTIONS_​] *extract* [​_OPTIONS_​] _FILE_ _PATTERN_

* DESCRIPTION

*mu extract* is the *mu* sub-command for extracting MIME-parts (e.g., attachments)
from mail messages. The sub-command works on message files, and does not require
the message to be indexed in the database.

For attachments, the file name used when saving it is the name of the attachment
in the message. If there is no such name, or when saving non-attachment
MIME-parts, a name is derived from the message-id of the message.

If you specify a regular express pattern as the second argument, all attachments
with filenames matching that pattern will be extracted. The regular expressions
are basic PCRE, and are case-sensitive by default; see {{{man-link(pcre,3)}}} for more details.

Without any options, *mu extract* simply outputs the list of leaf MIME-parts in
the message. Only `leaf' MIME-parts (including RFC822 attachments) are
considered, *multipart/** etc. are ignored.

Without a filename parameter, *mu extract* reads a message from standard-input. In
that case, you cannot use the second, _PATTERN_ parameter as this would be
ambiguous; instead, use the *--matches* option.

* EXTRACT OPTIONS

** -a, --save-attachments
Save all MIME-parts that look like attachments.

** --save-all
Save all non-multipart MIME-parts.

** --parts _parts_
Only consider the following numbered _parts_ (comma-separated list). The numbers
for the parts can be seen from running *mu extract* without any options but only
the message file.

** --target-dir _dir_
Save the parts in _dir_ rather than the current working directory.

** --overwrite
Overwrite existing files with the same name; by default overwriting is not
allowed.

** -u,--uncooked
By default, *mu* transforms the attachment filenames a bit (such as by replacing
spaces by dashes); with this option, leave that to the minimum for creating
a legal filename in the target directory.

** --matches _pattern_
Attachments with filenames matching _pattern_ will be extracted. The regular
expressions are basic PCRE, and are case-sensitive by default; see
{{{man-link(pcre,3)}}} for more details.

** --play
Try to `play' (open) the attachment with the default application for the
particular file type. On MacOS, this uses the *open* program, on other platforms
it uses *xdg-open*. You can choose a different program by setting the
*MU_PLAY_PROGRAM* environment variable.

** --decrypt
Attempt to decrypt encrypted parts. This is only possible if *mu* was built with
crypto-support.

** -r, --auto-retrieve
Attempt to retrieve crypto-keys automatically from the network, when needed.

#+include: "common-options.inc" :minlevel 1

* EXAMPLES

To display information about all the MIME-parts in a message file:
#+begin_example
$ mu extract msgfile
#+end_example

To extract MIME-part 3 and 4 from this message, overwriting existing files with
the same name:
#+begin_example
$ mu extract --parts=3,4 --overwrite msgfile
#+end_example

To extract all files ending in `.jpg' (case-insensitive):
#+begin_example
$ mu extract msgfile '.*\.jpg'
#+end_example

To extract an mp3-file, and play it in the default mp3-playing application:
#+begin_example
$ mu extract --play msgfile 'whoopsididitagain.mp3'
#+end_example

when reading from standard-input, you need *--matches*, so:
#+begin_example
$ cat msgfile | mu extract --play --matches 'whoopsididitagain.mp3'
#+end_example

#+include: "prefooter.inc" :minlevel 1

* SEE ALSO

{{{man-link(mu,1)}}}
