Windows PowerShell command on Get-command zip

Manual Pages for UNIX Operating System command usage for man zip

User Commands ZIP(1)

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(1)), unpacks zip archives. The

zip and unzip(1) programs 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 specify-

ing any parameters on the command line.

The program is useful for packaging a set of files for dis-

tribution; for archiving files; and for saving disk space by temporarily compressing unused files or directories.

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, protection, 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 automati-

cally 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

Info-ZIP Last change: 14 August 1999 (v2.3) 1

User Commands ZIP(1)

entries for new names. For example, if foo.zip exists and

contains foo/file1 and foo/file2, and the directory foo con-

tains 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 conjunc-

tion with the find(1) command. For example, to archive all

the C source files in the current directory and its sub-

directories:

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 pro-

gram. For example:

tar cf - . | zip backup -

would compress the output of the tar command for the purpose of backing up the current directory. This generally produces

better compression than the previous example 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

Info-ZIP Last change: 14 August 1999 (v2.3) 2

User Commands ZIP(1) 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 package. For

example:

dd if=/dev/nrst0 ibs=16k | funzip | tar xvf -

When changing an existing zip archive, zip will write a tem-

porary 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 exten-

sion, the extension .zip is added. If the name already con-

tains 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.

Info-ZIP Last change: 14 August 1999 (v2.3) 3

User Commands ZIP(1) 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 exam-

ple:

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 direc-

tories. 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.

Info-ZIP Last change: 14 August 1999 (v2.3) 4

User Commands ZIP(1)

-e Encrypt the contents of the zip archive using a pass-

word 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 correctly.

The reasons behind this are somewhat subtle but have to

do with the differences between the Unix-format file

times (always in GMT) and most of the other operating

systems (always local time) and the necessity to com-

pare the two. A typical TZ value is ``MET-1MEST''

(Middle European time with automatic 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.

Info-ZIP Last change: 14 August 1999 (v2.3) 5

User Commands ZIP(1)

-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 cor-

rupted. 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@include.lst

which will only include the files in the current direc-

tory and its subdirectories 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 parti-

tions 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 directory names. By default, zip will

store the full path (relative to the current path).

-jj [MacOS] record Fullpath (+ Volname). The complete path

Info-ZIP Last change: 14 August 1999 (v2.3) 6

User Commands ZIP(1)

including volume will be stored. By default the rela-

tive 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; actu-

ally, this deletes the target directories/files after

making the specified zip archive. If a directory

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 dangerous 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

Info-ZIP Last change: 14 August 1999 (v2.3) 7

User Commands ZIP(1)

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 com-

ments 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 systems 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, interactive prompt to enter pass-

words. (And where security is truly important, use strong encryption such as Pretty Good Privacy instead of the relatively weak encryption provided by standard

zipfile utilities.)

-q Quiet mode; eliminate informational messages and com-

ment prompts. (Useful, for example, in shell scripts

Info-ZIP Last change: 14 August 1999 (v2.3) 8

User Commands ZIP(1) 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 exam-

ple:

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 hid-

den 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

Info-ZIP Last change: 14 August 1999 (v2.3) 9

User Commands ZIP(1) 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 speci-

fied 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 verbose diagnostic info about

zipfile structure oddities.

When -v is the only command line argument, and stdout

is not redirected 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 features used to create

Info-ZIP Last change: 14 August 1999 (v2.3) 10

User Commands ZIP(1)

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 version 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 lev-

els. Also possible:

zip -r foo foo -x@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 compressing and storing the file referred to by the link (UNIX only).

-z Prompt for a multi-line comment for the entire zip

archive. The comment 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

Info-ZIP Last change: 14 August 1999 (v2.3) 11

User Commands ZIP(1) 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 holding 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 correspond-

ing compressed zip archive. In this case, you can create

Info-ZIP Last change: 14 August 1999 (v2.3) 12

User Commands ZIP(1)

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 arguments. 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 (example: [a-f], [0-9]).

When these characters are encountered (without being escaped with a backslash 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 spe-

cial character (i.e. ?*[]), or the entire argument must be enclosed in double quotes ("").

Info-ZIP Last change: 14 August 1999 (v2.3) 13

User Commands ZIP(1)

In general, use backslash to make zip do the pattern match-

ing with the -f (freshen) and -d (delete) options, and some-

times 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

compress(1), tar(1), unzip(1), gzip(1)

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. Processing may have completed success-

fully anyway; some broken zipfiles created by

other archivers have simple work-arounds.

4 zip was unable to allocate memory for one or more

buffers during 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

Info-ZIP Last change: 14 August 1999 (v2.3) 14

User Commands ZIP(1)

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 prop-

erly. 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.

Info-ZIP Last change: 14 August 1999 (v2.3) 15

User Commands ZIP(1)

Under VMS, zip hangs for file specification that uses DECnet

syntax foo::*.*.

On OS/2, zip cannot match some names, such as those includ-

ing an exclamation mark or a hash sign. This is a bug in

OS/2 itself: the 32-bit DosFindFirst/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 compatibility) 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. How-

ever, the structure layout returned by the 32-bit

DosQueryPathInfo() 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

loup Gailly, Onno van der Linden, Kai Uwe Rommel, Igor Man-

drichenko, 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 UTIL-

ITIES ARE PROVIDED 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@lists.wku.edu. For bug reports, please include the

version of zip (see zip-h ), the make options used to com-

pile 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 for-

mat; to Steve Burg for clarifications on the deflate format; to Haruhiko Okumura and Leonid Broukhis for providing some

Info-ZIP Last change: 14 August 1999 (v2.3) 16

User Commands ZIP(1)

useful ideas for the compression algorithm; to Keith Peter-

sen, 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 possi-

ble. 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.

ATTRIBUTES

See attributes(5) for descriptions of the following attri-

butes:

_______________________________________

| ATTRIBUTE TYPE | ATTRIBUTE VALUE|

|____________________|__________________|_

| Availability | compress/zip |

|____________________|__________________|_

| Interface Stability| Committed |

|____________________|_________________|

NOTES

Source for zip is available on http://opensolaris.org.

Info-ZIP Last change: 14 August 1999 (v2.3) 17