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NAME
unzip - list, test and extract compressed files in a ZIP
archive
SYNOPSIS
unzip [-Z] [-cflptuvz[abjnoqsCLMVX$]] file[.zip]
[file(s) ...] [-x xfile(s) ...] [-d exdir]
DESCRIPTION
unzip will list, test, or extract files from a ZIP archive,
commonly found on MS-DOS systems. The default behavior
(with no options) is to extract into the current directory
(and subdirectories below it) all files from the specified
ZIP archive. A companion program, zip(1L), creates ZIP
archives; both programs are compatible with archives created
by PKWARE's PKZIP and PKUNZIP for MS-DOS, but in many cases
the program options or default behaviors differ.
ARGUMENTS
file[.zip]
Path of the ZIP archive(s). If the file specification
is a wildcard, each matching file is processed in an
order determined by the operating system (or file sys-
tem). Only the filename can be a wildcard; the path
itself cannot. Wildcard expressions are similar to
Unix egrep(1) (regular) expressions and may contain:
* matches a sequence of 0 or more characters
? matches exactly 1 character
[...]
matches any single character found inside the
brackets; ranges are specified by a beginning
character, a hyphen, and an ending character. If
an exclamation point or a caret (`!' or `^') fol-
lows the left bracket, then the range of charac-
ters within the brackets is complemented (that is,
anything except the characters inside the brackets
is considered a match).
(Be sure to quote any character that might otherwise be
interpreted or modified by the operating system, par-
ticularly under Unix and VMS.) If no matches are
found, the specification is assumed to be a literal
filename; and if that also fails, the suffix .zip is
appended. Note that self-extracting ZIP files are sup-
ported, as with any other ZIP archive; just specify the
.exe suffix (if any) explicitly.
[file(s)]
An optional list of archive members to be processed,
separated by spaces. (VMS versions compiled with
VMSCLI defined must delimit files with commas instead.
See -v in OPTIONS below.) Regular expressions (wild-
cards) may be used to match multiple members; see
above. Again, be sure to quote expressions that would
otherwise be expanded or modified by the operating sys-
tem.
[-x xfile(s)]
An optional list of archive members to be excluded from
processing. Since wildcard characters match directory
separators (`/'), this option may be used to exclude
any files that are in subdirectories. For example,
``unzip foo *.[ch] -x */*'' would extract all C source
files in the main directory, but none in any subdirec-
tories. Without the -x option, all C source files in
all directories within the zipfile would be extracted.
[-d exdir]
An optional directory to which to extract files. By
default, all files and subdirectories are recreated in
the current directory; the -d option allows extraction
in an arbitrary directory (always assuming one has per-
mission to write to the directory). This option need
not appear at the end of the command line; it is also
accepted before the zipfile specification (with the
normal options), immediately after the zipfile specifi-
cation, or between the file(s) and the -x option. The
option and directory may be concatenated without any
white space between them, but note that this may cause
normal shell behavior to be suppressed. In particular,
``-d ~'' (tilde) is expanded by Unix C shells into the
name of the user's home directory, but ``-d~'' is
treated as a literal subdirectory ``~'' of the current
directory.
OPTIONS
Note that, in order to support obsolescent hardware, unzip's
usage screen is limited to 22 or 23 lines and should there-
fore be considered only a reminder of the basic unzip syntax
rather than an exhaustive list of all possible flags. The
exhaustive list follows:
-Z zipinfo(1L) mode. If the first option on the command
line is -Z, the remaining options are taken to be
zipinfo(1L) options. See the appropriate manual page
for a description of these options.
-A [OS/2, Unix DLL] print extended help for the DLL's pro-
gramming interface (API).
-c extract files to stdout/screen (``CRT''). This option
is similar to the -p option except that the name of
each file is printed as it is extracted, the -a option
is allowed, and ASCII-EBCDIC conversion is automati-
cally performed if appropriate. This option is not
listed in the unzip usage screen.
-f freshen existing files, i.e., extract only those files
that already exist on disk and that are newer than the
disk copies. By default unzip queries before overwrit-
ing, but the -o option may be used to suppress the
queries. Note that under many operating systems, the
TZ (timezone) environment variable must be set
correctly in order for -f and -u to work properly
(under Unix the variable is usually set automatically).
The reasons for this are somewhat subtle but have to do
with the differences between DOS-format file times
(always local time) and Unix-format times (always in
GMT/UTC) and the necessity to compare the two. A typi-
cal TZ value is ``PST8PDT'' (US Pacific time with
automatic adjustment for Daylight Savings Time or
``summer time'').
-l list archive files (short format). The names,
uncompressed file sizes and modification dates and
times of the specified files are printed, along with
totals for all files specified. If UnZip was compiled
with OS2_EAS defined, the -l option also lists columns
for the sizes of stored OS/2 extended attributes (EAs)
and OS/2 access control lists (ACLs). In addition, the
zipfile comment and individual file comments (if any)
are displayed. If a file was archived from a single-
case file system (for example, the old MS-DOS FAT file
system) and the -L option was given, the filename is
converted to lowercase and is prefixed with a caret
(^).
-p extract files to pipe (stdout). Nothing but the file
data is sent to stdout, and the files are always
extracted in binary format, just as they are stored (no
conversions).
-t test archive files. This option extracts each speci-
fied file in memory and compares the CRC (cyclic redun-
dancy check, an enhanced checksum) of the expanded file
with the original file's stored CRC value.
-T [most OSes] set the timestamp on the archive(s) to that
of the newest file in each one. This corresponds to
zip's -go option except that it can be used on wildcard
zipfiles (e.g., ``unzip -T \*.zip'') and is much fas-
ter.
-u update existing files and create new ones if needed.
This option performs the same function as the -f
option, extracting (with query) files that are newer
than those with the same name on disk, and in addition
it extracts those files that do not already exist on
disk. See -f above for information on setting the
timezone properly.
-v be verbose or print diagnostic version info. This
option has evolved and now behaves as both an option
and a modifier. As an option it has two purposes:
when a zipfile is specified with no other options, -v
lists archive files verbosely, adding to the basic -l
info the compression method, compressed size, compres-
sion ratio and 32-bit CRC. When no zipfile is speci-
fied (that is, the complete command is simply ``unzip
-v''), a diagnostic screen is printed. In addition to
the normal header with release date and version, unzip
lists the home Info-ZIP ftp site and where to find a
list of other ftp and non-ftp sites; the target operat-
ing system for which it was compiled, as well as (pos-
sibly) the hardware on which it was compiled, the com-
piler and version used, and the compilation date; any
special compilation options that might affect the
program's operation (see also DECRYPTION below); and
any options stored in environment variables that might
do the same (see ENVIRONMENT OPTIONS below). As a
modifier it works in conjunction with other options
(e.g., -t) to produce more verbose or debugging output;
this is not yet fully implemented but will be in future
releases.
-z display only the archive comment.
MODIFIERS
-a convert text files. Ordinarily all files are extracted
exactly as they are stored (as ``binary'' files). The
-a option causes files identified by zip as text files
(those with the `t' label in zipinfo listings, rather
than `b') to be automatically extracted as such, con-
verting line endings, end-of-file characters and the
character set itself as necessary. (For example, Unix
files use line feeds (LFs) for end-of-line (EOL) and
have no end-of-file (EOF) marker; Macintoshes use car-
riage returns (CRs) for EOLs; and most PC operating
systems use CR+LF for EOLs and control-Z for EOF. In
addition, IBM mainframes and the Michigan Terminal Sys-
tem use EBCDIC rather than the more common ASCII char-
acter set, and NT supports Unicode.) Note that zip's
identification of text files is by no means perfect;
some ``text'' files may actually be binary and vice
versa. unzip therefore prints ``[text]'' or
``[binary]'' as a visual check for each file it
extracts when using the -a option. The -aa option
forces all files to be extracted as text, regardless of
the supposed file type.
-b [non-VMS] treat all files as binary (no text conver-
sions). This is a shortcut for ---a.
-b [VMS] auto-convert binary files (see -a above) to
fixed-length, 512-byte record format. Doubling the
option (-bb) forces all files to be extracted in this
format.
-B [Unix only, and only if compiled with UNIXBACKUP
defined] save a backup copy of each overwritten file
with a tilde appended (e.g., the old copy of ``foo'' is
renamed to ``foo~''). This is similar to the default
behavior of emacs(1) in many locations.
-C match filenames case-insensitively. unzip's philosophy
is ``you get what you ask for'' (this is also responsi-
ble for the -L/-U change; see the relevant options
below). Because some file systems are fully case-
sensitive (notably those under the Unix operating sys-
tem) and because both ZIP archives and unzip itself are
portable across platforms, unzip's default behavior is
to match both wildcard and literal filenames case-
sensitively. That is, specifying ``makefile'' on the
command line will only match ``makefile'' in the
archive, not ``Makefile'' or ``MAKEFILE'' (and simi-
larly for wildcard specifications). Since this does
not correspond to the behavior of many other
operating/file systems (for example, OS/2 HPFS, which
preserves mixed case but is not sensitive to it), the
-C option may be used to force all filename matches to
be case-insensitive. In the example above, all three
files would then match ``makefile'' (or ``make*'', or
similar). The -C option affects files in both the nor-
mal file list and the excluded-file list (xlist).
-E [MacOS only] display contents of MacOS extra field dur-
ing restore operation.
-F [Acorn only] suppress removal of NFS filetype extension
from stored filenames.
-F [Unix only, and only if compiled with ACORN_FTYPE_NFS
defined] translate filetype information from ACORN RISC
OS extra field blocks into a NFS filetype extension and
append it to the names of the extracted files. (When
the stored filename appears to already have an appended
NFS filetype extension, it is replaced by the info from
the extra field.)
-i [MacOS only] ignore filenames stored in MacOS extra
fields. Instead, the most compatible filename stored in
the generic part of the entry's header is used.
-j junk paths. The archive's directory structure is not
recreated; all files are deposited in the extraction
directory (by default, the current one).
-J [BeOS only] junk file attributes. The file's BeOS file
attributes are not restored, just the file's data.
-J [MacOS only] ignore MacOS extra fields. All Macintosh
specific info is skipped. Data-fork and resource-fork
are restored as separate files.
-L convert to lowercase any filename originating on an
uppercase-only operating system or file system. (This
was unzip's default behavior in releases prior to 5.11;
the new default behavior is identical to the old
behavior with the -U option, which is now obsolete and
will be removed in a future release.) Depending on the
archiver, files archived under single-case file systems
(VMS, old MS-DOS FAT, etc.) may be stored as all-
uppercase names; this can be ugly or inconvenient when
extracting to a case-preserving file system such as
OS/2 HPFS or a case-sensitive one such as under Unix.
By default unzip lists and extracts such filenames
exactly as they're stored (excepting truncation,
conversion of unsupported characters, etc.); this
option causes the names of all files from certain sys-
tems to be converted to lowercase.
-M pipe all output through an internal pager similar to
the Unixmore(1) command. At the end of a screenful of
output, unzip pauses with a ``--More--'' prompt; the
next screenful may be viewed by pressing the Enter
(Return) key or the space bar. unzip can be terminated
by pressing the ``q'' key and, on some systems, the
Enter/Return key. Unlike Unix more(1), there is no
forward-searching or editing capability. Also, unzip
doesn't notice if long lines wrap at the edge of the
screen, effectively resulting in the printing of two or
more lines and the likelihood that some text will
scroll off the top of the screen before being viewed.
On some systems the number of available lines on the
screen is not detected, in which case unzip assumes the
height is 24 lines.
-n never overwrite existing files. If a file already
exists, skip the extraction of that file without
prompting. By default unzip queries before extracting
any file that already exists; the user may choose to
overwrite only the current file, overwrite all files,
skip extraction of the current file, skip extraction of
all existing files, or rename the current file.
-N [Amiga] extract file comments as Amiga filenotes. File
comments are created with the -c option of zip(1L), or
with the -N option of the Amiga port of zip(1L), which
stores filenotes as comments.
-o overwrite existing files without prompting. This is a
dangerous option, so use it with care. (It is often
used with -f, however, and is the only way to overwrite
directory EAs under OS/2.)
unzip's default behavior may be modified via options placed
in an environment variable. This can be done with any
option, but it is probably most useful with the -a, -L, -C,
-q, -o, or -n modifiers: make unzip auto-convert text files
by default, make it convert filenames from uppercase systems
to lowercase, make it match names case-insensitively, make
it quieter, or make it always overwrite or never overwrite
files as it extracts them. For example, to make unzip act
as quietly as possible, only reporting errors, one would use
one of the following commands:
UNZIP=-qq; export UNZIP Unix Bourne shell
setenv UNZIP -qq Unix C shell
set UNZIP=-qq OS/2 or MS-DOS
define UNZIP_OPTS "-qq" VMS (quotes for lowercase)
Environment options are, in effect, considered to be just
like any other command-line options, except that they are
effectively the first options on the command line. To over-
ride an environment option, one may use the ``minus opera-
tor'' to remove it. For instance, to override one of the
quiet-flags in the example above, use the command
unzip --q[other options] zipfile
The first hyphen is the normal switch character, and the
second is a minus sign, acting on the q option. Thus the
effect here is to cancel one quantum of quietness. To can-
cel both quiet flags, two (or more) minuses may be used:
unzip -t--q zipfile
unzip ---qt zipfile
(the two are equivalent). This may seem awkward or confus-
ing, but it is reasonably intuitive: just ignore the first
hyphen and go from there. It is also consistent with the
behavior of Unix nice(1).
As suggested by the examples above, the default variable
names are UNZIP_OPTS for VMS (where the symbol used to
install unzip as a foreign command would otherwise be con-
fused with the environment variable), and UNZIP for all
other operating systems. For compatibility with zip(1L),
UNZIPOPT is also accepted (don't ask). If both UNZIP and
UNZIPOPT are defined, however, UNZIP takes precedence.
unzip's diagnostic option (-v with no zipfile name) can be
used to check the values of all four possible unzip and
zipinfo environment variables.
The timezone variable (TZ) should be set according to the
local timezone in order for the -f and -u to operate
correctly. See the description of -f above for details.
This variable may also be necessary in order for timestamps
on extracted files to be set correctly. Under Windows 95/NT
unzip should know the correct timezone even if TZ is unset,
assuming the timezone is correctly set in the Control Panel.
DECRYPTION
Encrypted archives are fully supported by Info-ZIP software,
but due to United States export restrictions, the encryption
and decryption sources are not packaged with the regular
unzip and zip distributions. Since the crypt sources were
written by Europeans, however, they are freely available at
sites throughout the world; see the file ``WHERE'' in any
Info-ZIP source or binary distribution for locations both
inside and outside the US.
Because of the separate distribution, not all compiled ver-
sions of unzip support decryption. To check a version for
crypt support, either attempt to test or extract an
encrypted archive, or else check unzip's diagnostic screen
(see the -v option above) for ``[decryption]'' as one of the
special compilation options.
As noted above, the -P option may be used to supply a pass-
word on the command line, but at a cost in security. The
preferred decryption method is simply to extract normally;
if a zipfile member is encrypted, unzip will prompt for the
password without echoing what is typed. unzip continues to
use the same password as long as it appears to be valid, by
testing a 12-byte header on each file. The correct password
will always check out against the header, but there is a 1-
in-256 chance that an incorrect password will as well.
(This is a security feature of the PKWARE zipfile format; it
helps prevent brute-force attacks that might otherwise gain
a large speed advantage by testing only the header.) In the
case that an incorrect password is given but it passes the
header test anyway, either an incorrect CRC will be
generated for the extracted data or else unzip will fail
during the extraction because the ``decrypted'' bytes do not
constitute a valid compressed data stream.
If the first password fails the header check on some file,
unzip will prompt for another password, and so on until all
files are extracted. If a password is not known, entering a
null password (that is, just a carriage return or ``Enter'')
is taken as a signal to skip all further prompting. Only
unencrypted files in the archive(s) will thereafter be
extracted. (In fact, that's not quite true; older versions
of zip(1L) and zipcloak(1L) allowed null passwords, so unzip
checks each encrypted file to see if the null password
works. This may result in ``false positives'' and extrac-
tion errors, as noted above.)
Archives encrypted with 8-bit passwords (for example, pass-
words with accented European characters) may not be portable
across systems and/or other archivers. This problem stems
from the use of multiple encoding methods for such charac-
ters, including Latin-1 (ISO 8859-1) and OEM code page 850.
DOS PKZIP 2.04g uses the OEM code page; Windows PKZIP 2.50
uses Latin-1 (and is therefore incompatible with DOS PKZIP);
Info-ZIP uses the OEM code page on DOS, OS/2 and Win3.x
ports but Latin-1 everywhere else; and Nico Mak's WinZip 6.x
does not allow 8-bit passwords at all. UnZip 5.3 attempts
to use the default character set first (e.g., Latin-1), fol-
lowed by the alternate one (e.g., OEM code page) to test
passwords. On EBCDIC systems, if both of these fail, EBCDIC
encoding will be tested as a last resort. (Since there are
no known archivers that encrypt using EBCDIC encoding,
EBCDIC is not tested on non-EBCDIC systems.) ISO character
encodings other than Latin-1 are not supported.
EXAMPLES
To use unzip to extract all members of the archive
letters.zip into the current directory and subdirectories
below it, creating any subdirectories as necessary:
unzip letters
To extract all members of letters.zip into the current
directory only:
unzip -j letters
To test letters.zip, printing only a summary message indi-
cating whether the archive is OK or not:
unzip -tq letters
To test all zipfiles in the current directory, printing only
the summaries:
unzip -tq \*.zip
(The backslash before the asterisk is only required if the
shell expands wildcards, as in Unix; double quotes could
have been used instead, as in the source examples
below.) To extract to standard output all members of
letters.zip whose names end in .tex, auto-converting to the
local end-of-line convention and piping the output into
more(1):
unzip -ca letters \*.tex | more
To extract the binary file paper1.dvi to standard output and
pipe it to a printing program:
unzip -p articles paper1.dvi | dvips
To extract all FORTRAN and C source files--*.f, *.c, *.h,
and Makefile--into the /tmp directory:
unzip source.zip "*.[fch]" Makefile -d /tmp
(the double quotes are necessary only in Unix and only if
globbing is turned on). To extract all FORTRAN and C source
files, regardless of case (e.g., both *.c and *.C, and any
makefile, Makefile, MAKEFILE or similar):
unzip -C source.zip "*.[fch]" makefile -d /tmp
To extract any such files but convert any uppercase MS-DOS
or VMS names to lowercase and convert the line-endings of
all of the files to the local standard (without respect to
any files that might be marked ``binary''):
unzip -aaCL source.zip "*.[fch]" makefile -d /tmp
To extract only newer versions of the files already in the
current directory, without querying (NOTE: be careful of
unzipping in one timezone a zipfile created in another--ZIP
archives other than those created by Zip 2.1 or later con-
tain no timezone information, and a ``newer'' file from an
eastern timezone may, in fact, be older):
unzip -fo sources
To extract newer versions of the files already in the
current directory and to create any files not already there
(same caveat as previous example):
unzip -uo sources
To display a diagnostic screen showing which unzip and
zipinfo options are stored in environment variables, whether
decryption support was compiled in, the compiler with which
unzip was compiled, etc.:
unzip -v
In the last five examples, assume that UNZIP or UNZIP_OPTS
is set to -q. To do a singly quiet listing:
unzip -l file.zip
To do a doubly quiet listing:
unzip -ql file.zip
(Note that the ``.zip'' is generally not necessary.) To do
a standard listing:
unzip --ql file.zip
or
unzip -l-q file.zip
or
unzip -l--q file.zip (extra minuses don't hurt)
TIPS
The current maintainer, being a lazy sort, finds it very
useful to define a pair of aliases: tt for ``unzip -tq''
and ii for ``unzip -Z'' (or ``zipinfo''). One may then sim-
ply type ``tt zipfile'' to test an archive, something that
is worth making a habit of doing. With luck unzip will
report ``No errors detected in compressed data of
zipfile.zip,'' after which one may breathe a sigh of relief.
The maintainer also finds it useful to set the UNZIP
environment variable to ``-aL'' and is tempted to add ``-C''
as well. His ZIPINFO variable is set to ``-z''.
DIAGNOSTICS
The exit status (or error level) approximates the exit codes
defined by PKWARE and takes on the following values, except
under VMS:
0 normal; no errors or warnings detected.
1 one or more warning errors were encountered, but
processing completed successfully anyway. This
includes zipfiles where one or more files was
skipped due to unsupported compression method or
encryption with an unknown password.
2 a generic error in the zipfile format was
detected. Processing may have completed success-
fully anyway; some broken zipfiles created by
other archivers have simple work-arounds.
3 a severe error in the zipfile format was detected.
Processing probably failed immediately.
4 unzip was unable to allocate memory for one or
more buffers during program initialization.
5 unzip was unable to allocate memory or unable to
obtain a tty to read the decryption password(s).
6 unzip was unable to allocate memory during
decompression to disk.
7 unzip was unable to allocate memory during in-
memory decompression.
8 [currently not used]
9 the specified zipfiles were not found.
10 invalid options were specified on the command
line.
11 no matching files were found.
50 the disk is (or was) full during extraction.
51 the end of the ZIP archive was encountered prema-
turely.
80 the user aborted unzip prematurely with control-C
(or similar)
81 testing or extraction of one or more files failed
due to unsupported compression methods or unsup-
ported decryption.
82 no files were found due to bad decryption
password(s). (If even one file is successfully
processed, however, the exit status is 1.)
VMS interprets standard Unix (or PC) return values as other,
scarier-looking things, so unzip instead maps them into
VMS-style status codes. The current mapping is as follows:
1 (success) for normal exit, 0x7fff0001 for warning errors,
and (0x7fff000? + 16*normal_unzip_exit_status) for all other
errors, where the `?' is 2 (error) for unzip values 2, 9-11
and 80-82, and 4 (fatal error) for the remaining ones (3-8,
50, 51). In addition, there is a compilation option to
expand upon this behavior: defining RETURN_CODES results in
a human-readable explanation of what the error status means.
BUGS
Multi-part archives are not yet supported, except in con-
junction with zip. (All parts must be concatenated together
in order, and then ``zip -F'' must be performed on the con-
catenated archive in order to ``fix'' it.) This will defin-
itely be corrected in the next major release.
Archives read from standard input are not yet supported,
except with funzip (and then only the first member of the
archive can be extracted).
Archives encrypted with 8-bit passwords (e.g., passwords
with accented European characters) may not be portable
across systems and/or other archivers. See the discussion
in DECRYPTION above.
unzip's -M (``more'') option is overly simplistic in its
handling of screen output; as noted above, it fails to
detect the wrapping of long lines and may thereby cause
lines at the top of the screen to be scrolled off before
being read. unzip should detect and treat each occurrence
of line-wrap as one additional line printed. This requires
knowledge of the screen's width as well as its height. In
addition, unzip should detect the true screen geometry on
all systems.
Dates, times and permissions of stored directories are not
restored except under Unix.
[MS-DOS] When extracting or testing files from an archive on
a defective floppy diskette, if the ``Fail'' option is
chosen from DOS's ``Abort, Retry, Fail?'' message, older
versions of unzip may hang the system, requiring a reboot.
This problem appears to be fixed, but control-C (or
control-Break) can still be used to terminate unzip.
Under DEC Ultrix, unzip would sometimes fail on long zip-
files (bad CRC, not always reproducible). This was
apparently due either to a hardware bug (cache memory) or an
operating system bug (improper handling of page faults?).
Since Ultrix has been abandoned in favor of Digital Unix
(OSF/1), this may not be an issue anymore.
[Unix] Unix special files such as FIFO buffers (named
pipes), block devices and character devices are not restored
even if they are somehow represented in the zipfile, nor are
hard-linked files relinked. Basically the only file types
restored by unzip are regular files, directories and
symbolic (soft) links.
[OS/2] Extended attributes for existing directories are only
updated if the -o (``overwrite all'') option is given. This
is a limitation of the operating system; because directories
only have a creation time associated with them, unzip has no
way to determine whether the stored attributes are newer or
older than those on disk. In practice this may mean a two-
pass approach is required: first unpack the archive nor-
mally (with or without freshening/updating existing files),
then overwrite just the directory entries (e.g., ``unzip -o
foo */'').
[VMS] When extracting to another directory, only the [.foo]
syntax is accepted for the -d option; the simple Unix foo
syntax is silently ignored (as is the less common VMS
foo.dir syntax).
[VMS] When the file being extracted already exists, unzip's
query only allows skipping, overwriting or renaming; there
should additionally be a choice for creating a new version
of the file. In fact, the ``overwrite'' choice does create
a new version; the old version is not overwritten or
deleted.
SEE ALSO
funzip(1L), zip(1L), zipcloak(1L), zipgrep(1L), zipinfo(1L),
zipnote(1L), zipsplit(1L)
URL
The Info-ZIP home page is currently at
http://www.cdrom.com/pub/infozip/ .
AUTHORS
The primary Info-ZIP authors (current semi-active members of
the Zip-Bugs workgroup) are: Greg ``Cave Newt'' Roelofs
(UnZip); Onno van der Linden (Zip); Jean-loup Gailly
(compression); Mark Adler (decompression, fUnZip); Christian
Spieler (UnZip maintance coordination, VMS, MS-DOS, Windows
95, NT, shared code, general Zip and UnZip integration and
optimization); Mike White (Windows GUI, Windows DLLs); Kai
Uwe Rommel (OS/2); Paul Kienitz (Amiga, Windows 95); Chris
Herborth (BeOS, QNX, Atari); Jonathan Hudson (SMS/QDOS);
Sergio Monesi (Acorn RISC OS); Harald Denker (Atari, MVS);
John Bush (Solaris, Amiga); Hunter Goatley (VMS); Steve
Salisbury (Windows 95, NT); Steve Miller (Windows CE GUI),
Johnny Lee (MS-DOS, Windows 95, NT); and Dave Smith (Tandem
NSK). The author of the original unzip code upon which
Info-ZIP's was based is Samuel H. Smith; Carl Mascott did
the first Unix port; and David P. Kirschbaum organized and
led Info-ZIP in its early days with Keith Petersen hosting
the original mailing list at WSMR-SimTel20. The full list
of contributors to UnZip has grown quite large; please refer
to the CONTRIBS file in the UnZip source distribution for a
relatively complete version.
VERSIONS
v1.2 15 Mar 89 Samuel H. Smith
v2.0 9 Sep 89 Samuel H. Smith
v2.x fall 1989 many Usenet contributors
v3.0 1 May 90 Info-ZIP (DPK, consolidator)
v3.1 15 Aug 90 Info-ZIP (DPK, consolidator)
v4.0 1 Dec 90 Info-ZIP (GRR, maintainer)
v4.1 12 May 91 Info-ZIP
v4.2 20 Mar 92 Info-ZIP (Zip-Bugs subgroup, GRR)
v5.0 21 Aug 92 Info-ZIP (Zip-Bugs subgroup, GRR)
v5.01 15 Jan 93 Info-ZIP (Zip-Bugs subgroup, GRR)
v5.1 7 Feb 94 Info-ZIP (Zip-Bugs subgroup, GRR)
v5.11 2 Aug 94 Info-ZIP (Zip-Bugs subgroup, GRR)
v5.12 28 Aug 94 Info-ZIP (Zip-Bugs subgroup, GRR)
v5.2 30 Apr 96 Info-ZIP (Zip-Bugs subgroup, GRR)
v5.3 22 Apr 97 Info-ZIP (Zip-Bugs subgroup, GRR)
v5.31 31 May 97 Info-ZIP (Zip-Bugs subgroup, GRR)
v5.32 3 Nov 97 Info-ZIP (Zip-Bugs subgroup, GRR)
v5.4 28 Nov 98 Info-ZIP (Zip-Bugs subgroup, SPC)
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