Determine file type
see also :
file - update-mime-database
[options] [-] files
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tries to determine the mime type of a file using the Shared
MIME-info database. It is intended as a kind of
file(1) work-alike, but uses mimetypes instead of
If one symlinks
the file command to mimetype it will behave a
little more compatible, see
options to specify alternative magic files are not
implemented the same because of the conflicting data
formats. Also the wording of the descriptions will
switches I followed the manpage of file(1) version
4.02 when possible. They seem to differ completely from the
spec in the ’utilities’ chapter of
IEEE Std 1003.1-2001 (
Show output of all rules that
match the file.
this method now just returns one match for each method
(globs, magic, etc.).
Do not prepend filenames to
output lines (brief mode).
Force the program to look in
these directories for the shared mime-info database. The
directories specified by the basedir specification are
Print file descriptions instead
of mime types, this is the default when using
Print debug information about
how the mimetype was determined.
Read the names of the files to
be examined from the file ’namefile’ (one per
line) before the argument list.
Make mimetype behave a little
more file(1) compatible. This is turned on
automatically when you call mimetype by a link called
’-’ won’t be considered a separator
between options and filenames anymore, but becomes identical
to "--stdin". ( You can still use
’--’ as separator, but that is not
backward compatible with the original file command. ) Also
the default becomes to print descriptions instead of
Use string as custom separator
between the file name and its mimetype or description,
defaults to ’:’ .
Print a help message and
Use mime types, opposite to
"--describe", this is the default when
_not_ using "--file-compat".
Follow symbolic links.
The language attribute
specifies a two letter language code, this makes
descriptions being outputted in the specified language.
Do not check for extensions,
globs or inode type, only look at the content of the file.
This is particularly useful if for some reason you
don’t trust the name or the extension a file has.
Do not align output fields.
If you want an alternative
output format, you can specify a format string containing
the following escapes:
%f for the filename
%m mime type
not available when using this, you need to post-process the
output to do that.
Determine type of content from
STDIN , less powerful then normal file
checking because it only uses magic typing. This will happen
also if the STDIN filehandle is a pipe.
To use this
option IO::Scalar needs to be installed.
Print the version of the
program and exit.
Copyright (c) 2003, 2012 Jaap G Karssenberg. All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY ; without even the
implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE .
If a file has an empty mimetype or an empty description, most
probably the file doesn’t exist and the given name
doesn’t match any globs. An empty description can also mean
that there is no description available in the language you
The program exits with a non-zero exit value if either the
commandline arguments failed, a module it depends on wasn’t
found or the shared mime-info database wasn’t accesable.
See File::MimeInfo for more details.
These variables can list base directories to search for data
files. The shared mime-info will be expected in the "mime" sub
directory of one of these directories. If these are not set,
there will be searched for the following directories:
See also the " XDG Base Directory Specification"
The base dir for all data files is determined by two environment
variables, see " ENVIRONMENT ".
All other files are compiled from these source files. To
re-compile them use update-mime-database(1).
Compiled information about globs.
Compiled information about magic numbers.
Descriptions of a mimetype in multiple languages, used for the
The ’--all’ switch doesn’t really show all
matches, but only one per mime-typing method. This needs to be
implemnted in the modules first.
No known bugs,
please mail the author if you find one.
doesn’t provide a switch for looking inside compressed
files because it seems to me that this can only be done by
un-compressing the file, something that defeats the purpose.
On the other hand the option should exist for strict
compatibility with file(1). Possibly a subclass
should be made for this one day.