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+## README for file(1) Command and the libmagic(3) library ##
+
+    @(#) $File: README.md,v 1.5 2023/05/28 13:59:47 christos Exp $
+
+- Bug Tracker: <https://bugs.astron.com/>
+- Build Status: <https://travis-ci.org/file/file>
+- Download link: <ftp://ftp.astron.com/pub/file/>
+- E-mail: <christos@astron.com>
+- Fuzzing link: <https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:file>
+- Home page: https://www.darwinsys.com/file/
+- Mailing List archives: <https://mailman.astron.com/pipermail/file/>
+- Mailing List: <file@astron.com>
+- Public repo: <https://github.com/file/file>
+- Test framework: <https://github.com/file/file-tests>
+
+Phone: Do not even think of telephoning me about this program. Send
+cash first!
+
+This is Release 5.x of Ian Darwin's (copyright but distributable)
+file(1) command, an implementation of the Unix File(1) command.
+It knows the 'magic number' of several thousands of file types.
+This version is the standard "file" command for Linux, *BSD, and
+other systems. (See "patchlevel.h" for the exact release number).
+
+The major changes for 5.x are CDF file parsing, indirect magic,
+name/use (recursion) and overhaul in mime and ascii encoding
+handling.
+
+The major feature of 4.x is the refactoring of the code into a
+library, and the re-write of the file command in terms of that
+library. The library itself, libmagic can be used by 3rd party
+programs that wish to identify file types without having to fork()
+and exec() file. The prime contributor for 4.0 was Mans Rullgard.
+
+UNIX is a trademark of UNIX System Laboratories.
+
+The prime contributor to Release 3.8 was Guy Harris, who put in
+megachanges including byte-order independence.
+
+The prime contributor to Release 3.0 was Christos Zoulas, who put
+in hundreds of lines of source code changes, including his own
+ANSIfication of the code (I liked my own ANSIfication better, but
+his (__P()) is the "Berkeley standard" way of doing it, and I wanted
+UCB to include the code...), his HP-like "indirection" (a feature
+of the HP file command, I think), and his mods that finally got
+the uncompress (-z) mode finished and working.
+
+This release has compiled in numerous environments; see PORTING
+for a list and problems.
+
+This fine freeware file(1) follows the USG (System V) model of the
+file command, rather than the Research (V7) version or the V7-derived
+4.[23] Berkeley one. That is, the file /etc/magic contains much of
+the ritual information that is the source of this program's power.
+My version knows a little more magic (including tar archives) than
+System V; the /etc/magic parsing seems to be compatible with the
+(poorly documented) System V /etc/magic format (with one exception;
+see the man page).
+
+In addition, the /etc/magic file is built from a subdirectory
+for easier(?) maintenance.  I will act as a clearinghouse for
+magic numbers assigned to all sorts of data files that
+are in reasonable circulation. Send your magic numbers,
+in magic(5) format please, to the maintainer, Christos Zoulas.
+
+COPYING - read this first.
+* `README` - read this second (you are currently reading this file).
+* `INSTALL` - read on how to install
+* `src/apprentice.c` - parses /etc/magic to learn magic
+* `src/apptype.c` - used for OS/2 specific application type magic
+* `src/ascmagic.c` - third & last set of tests, based on hardwired assumptions.
+* `src/asctime_r.c` - replacement for OS's that don't have it.
+* `src/asprintf.c` - replacement for OS's that don't have it.
+* `src/buffer.c` - buffer handling functions.
+* `src/cdf.[ch]` - parser for Microsoft Compound Document Files
+* `src/cdf_time.c` - time converter for CDF.
+* `src/compress.c` - handles decompressing files to look inside.
+* `src/ctime_r.c` - replacement for OS's that don't have it.
+* `src/der.[ch]` - parser for Distinguished Encoding Rules
+* `src/dprintf.c` - replacement for OS's that don't have it.
+* `src/elfclass.h` - common code for elf 32/64.
+* `src/encoding.c` - handles unicode encodings
+* `src/file.c` - the main program
+* `src/file.h` - header file
+* `src/file_opts.h` - list of options
+* `src/fmtcheck.c` - replacement for OS's that don't have it.
+* `src/fsmagic.c` - first set of tests the program runs, based on filesystem info
+* `src/funcs.c` - utilility functions
+* `src/getline.c` - replacement for OS's that don't have it.
+* `src/getopt_long.c` - replacement for OS's that don't have it.
+* `src/gmtime_r.c` - replacement for OS's that don't have it.
+* `src/is_csv.c` - knows about Comma Separated Value file format (RFC 4180).
+* `src/is_json.c` - knows about JavaScript Object Notation format (RFC 8259).
+* `src/is_simh.c` - knows about SIMH tape file format.
+* `src/is_tar.c, tar.h` - knows about Tape ARchive format (courtesy John Gilmore).
+* `src/localtime_r.c` - replacement for OS's that don't have it.
+* `src/magic.h.in` - source file for magic.h
+* `src/mygetopt.h` - replacement for OS's that don't have it.
+* `src/magic.c` - the libmagic api
+* `src/names.h` - header file for ascmagic.c
+* `src/pread.c` - replacement for OS's that don't have it.
+* `src/print.c` - print results, errors, warnings.
+* `src/readcdf.c` - CDF wrapper.
+* `src/readelf.[ch]` - Stand-alone elf parsing code.
+* `src/softmagic.c` - 2nd set of tests, based on /etc/magic
+* `src/mygetopt.h` - replacement for OS's that don't have it.
+* `src/strcasestr.c` - replacement for OS's that don't have it.
+* `src/strlcat.c` - replacement for OS's that don't have it.
+* `src/strlcpy.c` - replacement for OS's that don't have it.
+* `src/strndup.c` - replacement for OS's that don't have it.
+* `src/tar.h` - tar file definitions
+* `src/vasprintf.c` - for systems that don't have it.
+* `doc/file.man` - man page for the command
+* `doc/magic.man` - man page for the magic file, courtesy Guy Harris.
+	Install as magic.4 on USG and magic.5 on V7 or Berkeley; cf Makefile.
+
+Magdir - directory of /etc/magic pieces
+------------------------------------------------------------------------------
+
+If you submit a new magic entry please make sure you read the following
+guidelines:
+
+- Initial match is preferably at least 32 bits long, and is a _unique_ match
+- If this is not feasible, use additional check
+- Match of <= 16 bits are not accepted
+- Delay printing string as much as possible, don't print output too early
+- Avoid printf arbitrary byte as string, which can be a source of
+  crash and buffer overflow
+
+- Provide complete information with entry:
+  * One line short summary
+  * Optional long description
+  * File extension, if applicable
+  * Full name and contact method (for discussion when entry has problem)
+  * Further reference, such as documentation of format
+
+gpg for dummies:
+------------------------------------------------------------------------------
+
+```
+$ gpg --verify file-X.YY.tar.gz.asc file-X.YY.tar.gz
+gpg: assuming signed data in `file-X.YY.tar.gz'
+gpg: Signature made WWW MMM DD HH:MM:SS YYYY ZZZ using DSA key ID KKKKKKKK
+```
+
+To download the key:
+
+```
+$ gpg --keyserver hkp://keys.gnupg.net --recv-keys KKKKKKKK
+```
+------------------------------------------------------------------------------
+
+
+Parts of this software were developed at SoftQuad Inc., developers
+of SGML/HTML/XML publishing software, in Toronto, Canada.
+SoftQuad was swallowed up by Corel in 2002 and does not exist any longer.