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readme.txt
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1993-08-07
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This is the readme file for the port to OS/2 1.x--2.x and DOS of
Ian Darwin's file(1) command. The UNIX program attempts to determine
the type of file based on the contents. A database of signatures
(the magic(4) file) is used.
Excerpted from the man-page:
File tests each argument in an attempt to classify it.
There are three sets of tests, performed in this order:
filesystem tests, magic number tests, and language tests.
The first test that succeeds causes the file type to be
printed.
Example:
[c:\tmp]file *
bin: directory
file.1: troff or preprocessor input text
file39a.zip: Zip archive (at least v2.0 to extract)
textfile: English text
pencils.gif: GIF picture version 87a 800 x 800, interlaced, 256 colors
tarfile: tar archive
tarfile.Z: block compressed data - 16 bits
Darwin's version has several enhancements over the usual UNIX versions,
including:
1. More flexible magicfile entries.
2. An "ascii magic" routine for keywords which can appear anywhere in
the file.
3. "-z" option will recursively unwind compress'd files to determine
the types.
This OS/2 port has an additional enhancement:
4. DosQ[uery]AppType is used to determine the type (DOS, OS/2, 32-bit,
etc.) of an executable or DLL.
QUICK START: This archive contains only the DOS executable; see
src/Where to find locations for OS/2 executables and sources.
Copy the file "magic" to one of the following locations:
* /etc/
* directory of the exectable
* a directory in PATH or DPATH
or use the command-line option "-m" to specify the magicfile location.
Now try:
file * or file *.*
Notes:
1. file v3 patchlevel9 is by Ian Darwin (darwin@cs.toronto.edu); see
the README file. This is the second release of the OS/2 version. Many
thanks to Greg Roelofs (newt@uchicago.edu) for the help.
2. The magicfile needs more work. There are some other suggestions in
notes*.os2. Thanks to Jouni Miettunen (jon@stekt.oulu.fi) for the
contributions. Darwin collects magicfile entries.
3. See the files notes*.os2 for additional information on the OS/2 and
DOS ports. This is the first port to OS/2 and DOS; feedback and
magic-file entries are welcomed.
4. The *.man files are formatted by "groff -man"; as such, they are
intended to be read with the "less" pager. This pager is available at
oak.oakland.edu:/pub/msdos/txtutl/less177e.zip
--
Darrel Hankerson hankedr@mail.auburn.edu or hank@ducvax.auburn.edu
11-Apr-93, updated 30-Jul-93
OS/2 version 3.9 to 3.9a updates:
Fixes: correct display of date info (e.g., on gzip'd files); fix
message on OS/2 exe's with no application type; correct code
which could cause trouble with the "-c" option on bad input.
Additions and corrections to the magic-file.
Changes: In OS/2 versions, continue on to the magic-file checks
in the case that DosQueryApptype indicates a DOS executable. This
permits use of the checks for special (e.g., compressed) executables.