EXTRACT(1)EXTRACT(1)NAMEextract - determine meta-information about a file
SYNOPSISextract [ -bgihLmnvV ] [ -l library ] [ -p type ] [ -x type ] file ...
DESCRIPTION
This manual page documents version 1.0.0 of the extract command.
extract tests each file specified in the argument list in an attempt to
infer meta-information from it. Each file is subjected to the
meta-data extraction libraries from libextractor.
libextractor classifies meta-information (also referred to as keywords)
into types. A list of all types can be obtained with the -L option.
OPTIONS-b Display the output in BiBTeX format.
-g Use grep-friendly output (all keywords on a single line for
each file). Use the verbose option to print the filename
first, followed by the keywords. Use the verbose option twice
to also display the keyword types. This option will not print
keyword types or non-textual metadata.
-h Print a brief summary of the options.
-i Run plugins in-process (for debugging). By default, each plug‐
in is run in its own process.
-l libraries
Use the specified libraries to extract keywords. The general
format of libraries is .I [[-]LIBRARYNAME[:[-]LIBRARYNAME]*]
where LIBRARYNAME is a libextractor compatible library and typ‐
ically of the form .Ijpeg. The minus before the libraryname
indicates that this library should be removed from the existing
list. To run only a few selected plugins, use -l in combina‐
tion with -n.
-L Print a list of all known keyword types.
-m Load the file into memory and perform extraction from memory
(for debugging).
-n Do not use the default set of extractors (typically all stan‐
dard extractors, currently mp3, ogg, jpg, gif, png, tiff, real,
html, pdf and mime-types), use only the extractors specified
with the .B -l option.
-p type
Print only the keywords matching the specified type. By
default, all keywords that are found and not removed as dupli‐
cates are printed.
-v Print the version number and exit.
-V Be verbose. This option can be specified multiple times to
increase verbosity further.
-x type
Exclude keywords of the specified type from the output. By
default, all keywords that are found and not removed as dupli‐
cates are printed.
SEE ALSOlibextractor(3) - description of the libextractor library
EXAMPLES
$ extract test/test.jpg
comment - (C) 2001 by Christian Grothoff, using gimp 1.2 1
mimetype - image/jpeg
$ extract-V -x comment test/test.jpg
Keywords for file test/test.jpg:
mimetype - image/jpeg
$ extract-p comment test/test.jpg
comment - (C) 2001 by Christian Grothoff, using gimp 1.2 1
$ extract-nV -l png.so -p comment test/test.jpg test/test.png
Keywords for file test/test.jpg:
Keywords for file test/test.png:
comment - Testing keyword extraction
LEGAL NOTICE
libextractor and the extract tool are released under the GPL. libex‐
tractor is a GNU package.
BUGS
A couple of file-formats (on the order of 10^3) are not recognized...
AUTHORSextract was originally written by Christian Grothoff <chris‐
tian@grothoff.org> and Vidyut Samanta <vids@cs.ucla.edu>. Use <libex‐
tractor@gnu.org> to contact the current maintainer(s).
AVAILABILITY
You can obtain the original author's latest version from
http://www.gnu.org/software/libextractor/
libextractor 1.0.0 Aug 7, 2012 EXTRACT(1)
