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ZIP(1L) ZIP(1L)
NAME
zip, zipcloak, zipnote, zipsplit - package and compress (archive) files
SYNOPSIS
zip [-aABcdDeEfFghjklLmoqrRSTuvVwXyz!@$] [-b path] [-n suffixes] [-t mmddyyyy]
[-tt mmddyyyy] [ zipfile [ file1 file2 ...]] [-xi list]
zipcloak [-dhL] [-b path] zipfile
zipnote [-hwL] [-b path] zipfile
zipsplit [-hiLpst] [-n size] [-b path] zipfile
DESCRIPTION
zip is a compression and file packaging utility for Unix, VMS, MSDOS, OS/2, Windows
NT, Minix, Atari and Macintosh, Amiga and Acorn RISC OS.
It is analogous to a combination of the UNIX commands tar(1) and compress(1) and is
compatible with PKZIP (Phil Katz’s ZIP for MSDOS systems).
A companion program (unzip(1L)), unpacks zip archives. The zip and unzip(1L) pro-
grams can work with archives produced by PKZIP, and PKZIP and PKUNZIP can work with
archives produced by zip. zip version 2.3 is compatible with PKZIP 2.04. Note
that PKUNZIP 1.10 cannot extract files produced by PKZIP 2.04 or zip 2.3. You must
use PKUNZIP 2.04g or unzip 5.0p1 (or later versions) to extract them.
For a brief help on zip and unzip, run each without specifying any parameters on
the command line.
The program is useful for packaging a set of files for distribution; for archiving
files; and for saving disk space by temporarily compressing unused files or direc-
tories.
The zip program puts one or more compressed files into a single zip archive, along
with information about the files (name, path, date, time of last modification, pro-
tection, and check information to verify file integrity). An entire directory
structure can be packed into a zip archive with a single command. Compression
ratios of 2:1 to 3:1 are common for text files. zip has one compression method
(deflation) and can also store files without compression. zip automatically
chooses the better of the two for each file to be compressed.
When given the name of an existing zip archive, zip will replace identically named
entries in the zip archive or add entries for new names. For example, if foo.zip
exists and contains foo/file1 and foo/file2, and the directory foo contains the
files foo/file1 and foo/file3, then:
zip -r foo foo
will replace foo/file1 in foo.zip and add foo/file3 to foo.zip. After this,
foo.zip contains foo/file1, foo/file2, and foo/file3, with foo/file2 unchanged from
before.
If the file list is specified as -@, [Not on MacOS] zip takes the list of input
files from standard input. Under UNIX, this option can be used to powerful effect
in conjunction with the find(1) command. For example, to archive all the C source
files in the current directory and its subdirectories:
find . -name "*.[ch]" -print | zip source -@
(note that the pattern must be quoted to keep the shell from expanding it). zip
will also accept a single dash ("-") as the zip file name, in which case it will
write the zip file to standard output, allowing the output to be piped to another
program. For example:
zip -r - . | dd of=/dev/nrst0 obs=16k
would write the zip output directly to a tape with the specified block size for the
purpose of backing up the current directory.
zip also accepts a single dash ("-") as the name of a file to be compressed, in
which case it will read the file from standard input, allowing zip to take input
from another program. For example:
tar cf - . | zip backup -
would compress the output of the tar command for the purpose of backing up the cur-
rent directory. This generally produces better compression than the previous exam-
ple using the -r option, because zip can take advantage of redundancy between
files. The backup can be restored using the command
unzip -p backup | tar xf -
When no zip file name is given and stdout is not a terminal, zip acts as a filter,
compressing standard input to standard output. For example,
tar cf - . | zip | dd of=/dev/nrst0 obs=16k
is equivalent to
tar cf - . | zip - - | dd of=/dev/nrst0 obs=16k
zip archives created in this manner can be extracted with the program funzip which
is provided in the unzip package, or by gunzip which is provided in the gzip pack-
age. For example:
dd if=/dev/nrst0 ibs=16k | funzip | tar xvf -
When changing an existing zip archive, zip will write a temporary file with the new
contents, and only replace the old one when the process of creating the new version
has been completed without error.
If the name of the zip archive does not contain an extension, the extension .zip is
added. If the name already contains an extension other than .zip the existing
extension is kept unchanged.
OPTIONS
-a [Systems using EBCDIC] Translate file to ASCII format.
-A Adjust self-extracting executable archive. A self-extracting executable
archive is created by prepending the SFX stub to an existing archive. The -A
option tells zip to adjust the entry offsets stored in the archive to take
into account this "preamble" data.
Note: self-extracting archives for the Amiga are a special case. At present, only
the Amiga port of Zip is capable of adjusting or updating these without corrupting
them. -J can be used to remove the SFX stub if other updates need to be made.
-B [VM/CMS and MVS] force file to be read binary (default is text).
-Bn [TANDEM] set Edit/Enscribe formatting options with n defined as
bit 0: Don’t add delimiter (Edit/Enscribe)
bit 1: Use LF rather than CR/LF as delimiter (Edit/Enscribe)
bit 2: Space fill record to maximum record length (Enscribe)
bit 3: Trim trailing space (Enscribe)
bit 8: Force 30K (Expand) large read for unstructured files
-b path
Use the specified path for the temporary zip archive. For example:
zip -b /tmp stuff *
will put the temporary zip archive in the directory /tmp, copying over
stuff.zip to the current directory when done. This option is only useful
when updating an existing archive, and the file system containing this old
archive does not have enough space to hold both old and new archives at the
same time.
-c Add one-line comments for each file. File operations (adding, updating) are
done first, and the user is then prompted for a one-line comment for each
file. Enter the comment followed by return, or just return for no comment.
-d Remove (delete) entries from a zip archive. For example:
zip -d foo foo/tom/junk foo/harry/\* \*.o
will remove the entry foo/tom/junk, all of the files that start with
foo/harry/, and all of the files that end with .o (in any path). Note that
shell pathname expansion has been inhibited with backslashes, so that zip
can see the asterisks, enabling zip to match on the contents of the zip
archive instead of the contents of the current directory.
Under MSDOS, -d is case sensitive when it matches names in the zip archive.
This requires that file names be entered in upper case if they were zipped
by PKZIP on an MSDOS system.
-df [MacOS] Include only data-fork of files zipped into the archive. Good for
exporting files to foreign operating-systems. Resource-forks will be
ignored at all.
-D Do not create entries in the zip archive for directories. Directory entries
are created by default so that their attributes can be saved in the zip
archive. The environment variable ZIPOPT can be used to change the default
options. For example under Unix with sh:
ZIPOPT="-D"; export ZIPOPT
(The variable ZIPOPT can be used for any option except -i and -x and can
include several options.) The option -D is a shorthand for -x "*/" but the
latter cannot be set as default in the ZIPOPT environment variable.
-e Encrypt the contents of the zip archive using a password which is entered on
the terminal in response to a prompt (this will not be echoed; if standard
error is not a tty, zip will exit with an error). The password prompt is
repeated to save the user from typing errors.
-E [OS/2] Use the .LONGNAME Extended Attribute (if found) as filename.
-f Replace (freshen) an existing entry in the zip archive only if it has been
modified more recently than the version already in the zip archive; unlike
the update option (-u) this will not add files that are not already in the
zip archive. For example:
zip -f foo
This command should be run from the same directory from which the original
zip command was run, since paths stored in zip archives are always relative.
Note that the timezone environment variable TZ should be set according to
the local timezone in order for the -f , -u and -o options to work cor-
rectly.
The reasons behind this are somewhat subtle but have to do with the differ-
ences between the Unix-format file times (always in GMT) and most of the
other operating systems (always local time) and the necessity to compare the
two. A typical TZ value is ‘‘MET-1MEST’’ (Middle European time with auto-
matic adjustment for ‘‘summertime’’ or Daylight Savings Time).
-F Fix the zip archive. This option can be used if some portions of the archive
are missing. It is not guaranteed to work, so you MUST make a backup of the
original archive first.
When doubled as in -FF the compressed sizes given inside the damaged archive
are not trusted and zip scans for special signatures to identify the limits
between the archive members. The single -F is more reliable if the archive
is not too much damaged, for example if it has only been truncated, so try
this option first.
Neither option will recover archives that have been incorrectly transferred
in ascii mode instead of binary. After the repair, the -t option of unzip
may show that some files have a bad CRC. Such files cannot be recovered; you
can remove them from the archive using the -d option of zip.
-g Grow (append to) the specified zip archive, instead of creating a new one.
If this operation fails, zip attempts to restore the archive to its original
state. If the restoration fails, the archive might become corrupted. This
option is ignored when there’s no existing archive or when at least one
archive member must be updated or deleted.
-h Display the zip help information (this also appears if zip is run with no
arguments).
-i files
Include only the specified files, as in:
zip -r foo . -i \*.c
which will include only the files that end in .c in the current directory
and its subdirectories. (Note for PKZIP users: the equivalent command is
pkzip -rP foo *.c
PKZIP does not allow recursion in directories other than the current one.)
The backslash avoids the shell filename substitution, so that the name
matching is performed by zip at all directory levels.
Also possible:
zip -r foo . -i AT include.lst
which will only include the files in the current directory and its subdirec-
tories that match the patterns in the file include.lst.
-I [Acorn RISC OS] Don’t scan through Image files. When used, zip will not
consider Image files (eg. DOS partitions or Spark archives when SparkFS is
loaded) as directories but will store them as single files.
For example, if you have SparkFS loaded, zipping a Spark archive will result
in a zipfile containing a directory (and its content) while using the ’I’
option will result in a zipfile containing a Spark archive. Obviously this
second case will also be obtained (without the ’I’ option) if SparkFS isn’t
loaded.
-j Store just the name of a saved file (junk the path), and do not store direc-
tory names. By default, zip will store the full path (relative to the cur-
rent path).
-jj [MacOS] record Fullpath (+ Volname). The complete path including volume will
be stored. By default the relative path will be stored.
-J Strip any prepended data (e.g. a SFX stub) from the archive.
-k Attempt to convert the names and paths to conform to MSDOS, store only the
MSDOS attribute (just the user write attribute from UNIX), and mark the
entry as made under MSDOS (even though it was not); for compatibility with
PKUNZIP under MSDOS which cannot handle certain names such as those with two
dots.
-l Translate the Unix end-of-line character LF into the MSDOS convention CR LF.
This option should not be used on binary files. This option can be used on
Unix if the zip file is intended for PKUNZIP under MSDOS. If the input files
already contain CR LF, this option adds an extra CR. This ensure that unzip
-a on Unix will get back an exact copy of the original file, to undo the
effect of zip -l.
-ll Translate the MSDOS end-of-line CR LF into Unix LF. This option should not
be used on binary files. This option can be used on MSDOS if the zip file
is intended for unzip under Unix.
-L Display the zip license.
-m Move the specified files into the zip archive; actually, this deletes the
target directories/files after making the specified zip archive. If a direc-
tory becomes empty after removal of the files, the directory is also
removed. No deletions are done until zip has created the archive without
error. This is useful for conserving disk space, but is potentially danger-
ous so it is recommended to use it in combination with -T to test the
archive before removing all input files.
-n suffixes
Do not attempt to compress files named with the given suffixes. Such files
are simply stored (0% compression) in the output zip file, so that zip
doesn’t waste its time trying to compress them. The suffixes are separated
by either colons or semicolons. For example:
zip -rn .Z:.zip:.tiff:.gif:.snd foo foo
will copy everything from foo into foo.zip, but will store any files that
end in .Z, .zip, .tiff, .gif, or .snd without trying to compress them (image
and sound files often have their own specialized compression methods). By
default, zip does not compress files with extensions in the list
.Z:.zip:.zoo:.arc:.lzh:.arj. Such files are stored directly in the output
archive. The environment variable ZIPOPT can be used to change the default
options. For example under Unix with csh:
setenv ZIPOPT "-n .gif:.zip"
To attempt compression on all files, use:
zip -n : foo
The maximum compression option -9 also attempts compression on all files
regardless of extension.
On Acorn RISC OS systems the suffixes are actually filetypes (3 hex digit
format). By default, zip does not compress files with filetypes in the list
DDC:D96:68E (i.e. Archives, CFS files and PackDir files).
-N [Amiga, MacOS] Save Amiga or MacOS filenotes as zipfile comments. They can
be restored by using the -N option of unzip. If -c is used also, you are
prompted for comments only for those files that do not have filenotes.
-o Set the "last modified" time of the zip archive to the latest (oldest) "last
modified" time found among the entries in the zip archive. This can be used
without any other operations, if desired. For example:
zip -o foo
will change the last modified time of foo.zip to the latest time of the
entries in foo.zip.
-P password
use password to encrypt zipfile entries (if any). THIS IS INSECURE!
Many multi-user operating systems provide ways for any user to see
the current command line of any other user; even on stand-alone sys-
tems there is always the threat of over-the-shoulder peeking. Stor-
ing the plaintext password as part of a command line in an automated
script is even worse. Whenever possible, use the non-echoing, inter-
active prompt to enter passwords. (And where security is truly
important, use strong encryption such as Pretty Good Privacy instead
of the relatively weak encryption provided by standard zipfile utili-
ties.)
-q Quiet mode; eliminate informational messages and comment prompts.
(Useful, for example, in shell scripts and background tasks).
-Qn [QDOS] store information about the file in the file header with n
defined as
bit 0: Don’t add headers for any file
bit 1: Add headers for all files
bit 2: Don’t wait for interactive key press on exit
-r Travel the directory structure recursively; for example:
zip -r foo foo
In this case, all the files and directories in foo are saved in a zip
archive named foo.zip, including files with names starting with ".",
since the recursion does not use the shell’s file-name substitution
mechanism. If you wish to include only a specific subset of the
files in directory foo and its subdirectories, use the -i option to
specify the pattern of files to be included. You should not use -r
with the name ".*", since that matches ".." which will attempt to
zip up the parent directory (probably not what was intended).
-R Travel the directory structure recursively starting at the current
directory; for example:
zip -R foo ’*.c’
In this case, all the files matching *.c in the tree starting at the
current directory are stored into a zip archive named foo.zip. Note
for PKZIP users: the equivalent command is
pkzip -rP foo *.c
-S [MSDOS, OS/2, WIN32 and ATARI] Include system and hidden files.
[MacOS] Includes finder invisible files, which are ignored otherwise.
-t mmddyyyy
Do not operate on files modified prior to the specified date, where
mm is the month (0-12), dd is the day of the month (1-31), and yyyy
is the year. The ISO 8601 date format yyyy-mm-dd is also accepted.
For example:
zip -rt 12071991 infamy foo
zip -rt 1991-12-07 infamy foo
will add all the files in foo and its subdirectories that were last
modified on or after 7 December 1991, to the zip archive infamy.zip.
-tt mmddyyyy
Do not operate on files modified after or at the specified date,
where mm is the month (0-12), dd is the day of the month (1-31), and
yyyy is the year. The ISO 8601 date format yyyy-mm-dd is also
accepted. For example:
zip -rtt 11301995 infamy foo
zip -rtt 1995-11-30 infamy foo
will add all the files in foo and its subdirectories that were last
modified before the 30 November 1995, to the zip archive infamy.zip.
-T Test the integrity of the new zip file. If the check fails, the old
zip file is unchanged and (with the -m option) no input files are
removed.
-u Replace (update) an existing entry in the zip archive only if it has
been modified more recently than the version already in the zip
archive. For example:
zip -u stuff *
will add any new files in the current directory, and update any files
which have been modified since the zip archive stuff.zip was last
created/modified (note that zip will not try to pack stuff.zip into
itself when you do this).
Note that the -u option with no arguments acts like the -f (freshen)
option.
-v Verbose mode or print diagnostic version info.
Normally, when applied to real operations, this option enables the
display of a progress indicator during compression and requests ver-
bose diagnostic info about zipfile structure oddities.
When -v is the only command line argument, and stdout is not redi-
rected to a file, a diagnostic screen is printed. In addition to the
help screen header with program name, version, and release date, some
pointers to the Info-ZIP home and distribution sites are given. Then,
it shows information about the target environment (compiler type and
version, OS version, compilation date and the enabled optional fea-
tures used to create the zip executable.
-V [VMS] Save VMS file attributes. zip archives created with this
option will generally not be usable on other systems.
-w [VMS] Append the version number of the files to the name, including
multiple versions of files. (default: use only the most recent ver-
sion of a specified file).
-x files
Explicitly exclude the specified files, as in:
zip -r foo foo -x \*.o
which will include the contents of foo in foo.zip while excluding all
the files that end in .o. The backslash avoids the shell filename
substitution, so that the name matching is performed by zip at all
directory levels.
Also possible:
zip -r foo foo -x AT exclude.lst
which will include the contents of foo in foo.zip while excluding all
the files that match the patterns in the file exclude.lst.
-X Do not save extra file attributes (Extended Attributes on OS/2,
uid/gid and file times on Unix).
-y Store symbolic links as such in the zip archive, instead of compress-
ing and storing the file referred to by the link (UNIX only).
-z Prompt for a multi-line comment for the entire zip archive. The com-
ment is ended by a line containing just a period, or an end of file
condition (^D on UNIX, ^Z on MSDOS, OS/2, and VAX/VMS). The comment
can be taken from a file:
zip -z foo < foowhat
-# Regulate the speed of compression using the specified digit #, where
-0 indicates no compression (store all files), -1 indicates the
fastest compression method (less compression) and -9 indicates the
slowest compression method (optimal compression, ignores the suffix
list). The default compression level is -6.
-! [WIN32] Use priviliges (if granted) to obtain all aspects of WinNT
security.
-@ Take the list of input files from standard input. Only one filename
per line.
-$ [MSDOS, OS/2, WIN32] Include the volume label for the the drive hold-
ing the first file to be compressed. If you want to include only the
volume label or to force a specific drive, use the drive name as
first file name, as in:
zip -$ foo a: c:bar
EXAMPLES
The simplest example:
zip stuff *
creates the archive stuff.zip (assuming it does not exist) and puts all the
files in the current directory in it, in compressed form (the .zip suffix is
added automatically, unless that archive name given contains a dot already;
this allows the explicit specification of other suffixes).
Because of the way the shell does filename substitution, files starting with
"." are not included; to include these as well:
zip stuff .* *
Even this will not include any subdirectories from the current directory.
To zip up an entire directory, the command:
zip -r foo foo
creates the archive foo.zip, containing all the files and directories in the
directory foo that is contained within the current directory.
You may want to make a zip archive that contains the files in foo, without
recording the directory name, foo. You can use the -j option to leave off
the paths, as in:
zip -j foo foo/*
If you are short on disk space, you might not have enough room to hold both
the original directory and the corresponding compressed zip archive. In
this case, you can create the archive in steps using the -m option. If foo
contains the subdirectories tom, dick, and harry, you can:
zip -rm foo foo/tom
zip -rm foo foo/dick
zip -rm foo foo/harry
where the first command creates foo.zip, and the next two add to it. At the
completion of each zip command, the last created archive is deleted, making
room for the next zip command to function.
PATTERN MATCHING
This section applies only to UNIX. Watch this space for details on MSDOS
and VMS operation.
The UNIX shells (sh(1) and csh(1)) do filename substitution on command argu-
ments. The special characters are:
? match any single character
* match any number of characters (including none)
[] match any character in the range indicated within the brackets (exam-
ple: [a-f], [0-9]).
When these characters are encountered (without being escaped with a back-
slash or quotes), the shell will look for files relative to the current path
that match the pattern, and replace the argument with a list of the names
that matched.
The zip program can do the same matching on names that are in the zip
archive being modified or, in the case of the -x (exclude) or -i (include)
options, on the list of files to be operated on, by using backslashes or
quotes to tell the shell not to do the name expansion. In general, when zip
encounters a name in the list of files to do, it first looks for the name in
the file system. If it finds it, it then adds it to the list of files to
do. If it does not find it, it looks for the name in the zip archive being
modified (if it exists), using the pattern matching characters described
above, if present. For each match, it will add that name to the list of
files to be processed, unless this name matches one given with the -x
option, or does not match any name given with the -i option.
The pattern matching includes the path, and so patterns like \*.o match
names that end in ".o", no matter what the path prefix is. Note that the
backslash must precede every special character (i.e. ?*[]), or the entire
argument must be enclosed in double quotes ("").
In general, use backslash to make zip do the pattern matching with the -f
(freshen) and -d (delete) options, and sometimes after the -x (exclude)
option when used with an appropriate operation (add, -u, -f, or -d).
ENVIRONMENT
ZIPOPT contains default options that will be used when running zip
ZIP [Not on RISC OS and VMS] see ZIPOPT
Zip$Options
[RISC OS] see ZIPOPT
Zip$Exts
[RISC OS] contains extensions separated by a : that will cause native
filenames with one of the specified extensions to be added to the zip
file with basename and extension swapped. zip
ZIP_OPTS
[VMS] see ZIPOPT
SEE ALSO
compress(1), shar(1L), tar(1), unzip(1L), gzip(1L)
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.
2 unexpected end of zip file.
3 a generic error in the zipfile format was detected. Process-
ing may have completed successfully anyway; some broken zip-
files created by other archivers have simple work-arounds.
4 zip was unable to allocate memory for one or more buffers dur-
ing program initialization.
5 a severe error in the zipfile format was detected. Processing
probably failed immediately.
6 entry too large to be split with zipsplit
7 invalid comment format
8 zip -T failed or out of memory
9 the user aborted zip prematurely with control-C (or similar)
10 zip encountered an error while using a temp file
11 read or seek error
12 zip has nothing to do
13 missing or empty zip file
14 error writing to a file
15 zip was unable to create a file to write to
16 bad command line parameters
18 zip could not open a specified file to read
VMS interprets standard Unix (or PC) return values as other, scarier-looking
things, so zip instead maps them into VMS-style status codes. The current
mapping is as follows: 1 (success) for normal exit,
and (0x7fff000? + 16*normal_zip_exit_status) for all errors, where the ‘?’
is 0 (warning) for zip value 12, 2 (error) for the zip values 3, 6, 7, 9,
13, 16, 18, and 4 (fatal error) for the remaining ones.
BUGS
zip 2.3 is not compatible with PKUNZIP 1.10. Use zip 1.1 to produce zip
files which can be extracted by PKUNZIP 1.10.
zip files produced by zip 2.3 must not be updated by zip 1.1 or PKZIP 1.10,
if they contain encrypted members or if they have been produced in a pipe or
on a non-seekable device. The old versions of zip or PKZIP would create an
archive with an incorrect format. The old versions can list the contents of
the zip file but cannot extract it anyway (because of the new compression
algorithm). If you do not use encryption and use regular disk files, you do
not have to care about this problem.
Under VMS, not all of the odd file formats are treated properly. Only
stream-LF format zip files are expected to work with zip. Others can be
converted using Rahul Dhesi’s BILF program. This version of zip handles
some of the conversion internally. When using Kermit to transfer zip files
from Vax to MSDOS, type "set file type block" on the Vax. When transfering
from MSDOS to Vax, type "set file type fixed" on the Vax. In both cases,
type "set file type binary" on MSDOS.
Under VMS, zip hangs for file specification that uses DECnet syntax
foo::*.*.
On OS/2, zip cannot match some names, such as those including an exclamation
mark or a hash sign. This is a bug in OS/2 itself: the 32-bit DosFind-
First/Next don’t find such names. Other programs such as GNU tar are also
affected by this bug.
Under OS/2, the amount of Extended Attributes displayed by DIR is (for com-
patibility) the amount returned by the 16-bit version of DosQueryPathInfo().
Otherwise OS/2 1.3 and 2.0 would report different EA sizes when DIRing a
file. However, the structure layout returned by the 32-bit DosQuery-
PathInfo() is a bit different, it uses extra padding bytes and link pointers
(it’s a linked list) to have all fields on 4-byte boundaries for portability
to future RISC OS/2 versions. Therefore the value reported by zip (which
uses this 32-bit-mode size) differs from that reported by DIR. zip stores
the 32-bit format for portability, even the 16-bit MS-C-compiled version
running on OS/2 1.3, so even this one shows the 32-bit-mode size.
AUTHORS
Copyright (C) 1990-1997 Mark Adler, Richard B. Wales, Jean-loup Gailly, Onno
van der Linden, Kai Uwe Rommel, Igor Mandrichenko, John Bush and Paul
Kienitz. Permission is granted to any individual or institution to use,
copy, or redistribute this software so long as all of the original files are
included, that it is not sold for profit, and that this copyright notice is
retained.
LIKE ANYTHING ELSE THAT’S FREE, ZIP AND ITS ASSOCIATED UTILITIES ARE PRO-
VIDED AS IS AND COME WITH NO WARRANTY OF ANY KIND, EITHER EXPRESSED OR
IMPLIED. IN NO EVENT WILL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DAMAGES
RESULTING FROM THE USE OF THIS SOFTWARE.
Please send bug reports and comments by email to: zip-bugs AT lists.edu.
For bug reports, please include the version of zip (see zip-h ), the make
options used to compile it see zip-v ), the machine and operating system in
use, and as much additional information as possible.
ACKNOWLEDGEMENTS
Thanks to R. P. Byrne for his Shrink.Pas program, which inspired this
project, and from which the shrink algorithm was stolen; to Phil Katz for
placing in the public domain the zip file format, compression format, and
.ZIP filename extension, and for accepting minor changes to the file format;
to Steve Burg for clarifications on the deflate format; to Haruhiko Okumura
and Leonid Broukhis for providing some useful ideas for the compression
algorithm; to Keith Petersen, Rich Wales, Hunter Goatley and Mark Adler for
providing a mailing list and ftp site for the Info-ZIP group to use; and
most importantly, to the Info-ZIP group itself (listed in the file
infozip.who) without whose tireless testing and bug-fixing efforts a
portable zip would not have been possible. Finally we should thank (blame)
the first Info-ZIP moderator, David Kirschbaum, for getting us into this
mess in the first place. The manual page was rewritten for UNIX by R. P. C.
Rodgers.
Info-ZIP 14 August 1999 (v2.3) ZIP(1L)
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