ZIPINFO(1) ZIPINFO(1)
NAME
zipinfo - list detailed information about a ZIP archive
file
SYNOPSIS
zipinfo [-1smlvht] file[.zip] [filespec ...]
ARGUMENTS
file[.zip] Path of the ZIP archive. The suffix ``.zip''
is applied if the file specified does not
exist. Note that self-extracting ZIP files
are supported; just specify the ``.exe'' suf-
fix yourself.
[filespec] An optional list of archive members to be pro-
cessed. Expressions may be used to match mul-
tiple members; be sure to quote expressions
that contain characters interpreted by the
Unix shell. See PATTERN MATCHING (below) for
more details.
OPTIONS
-1 list filenames only, one per line (useful for pipes)
-s list zipfile info in short Unix ``ls -l'' format:
default
-m list zipfile info in medium Unix ``ls -l'' format
-l list zipfile info in long Unix ``ls -l'' format
-v list zipfile information in verbose, multi-page format
-h list header line
-t list totals for files listed or for all files
PATTERN MATCHING
All archive members are listed unless a filespec is pro-
vided to specify a subset of the archive members. The
filespec is similar to an egrep expression, and may con-
tain:
* matches a sequence of 0 or more characters
? matches exactly 1 character
\nnn matches the character having octal code nnn
[...] matches any single character found inside the
brackets; ranges are specified by a beginning char-
acter, a hyphen, and an ending character. If an
exclamation point or a carat (`!' or `^') follows
the left bracket, then the range of characters
matched is complemented with respect to the ASCII
character set (that is, anything except the charac-
ters inside the brackets is considered a match).
DESCRIPTION
ZipInfo lists technical information about a ZIP archive,
including information file access permissions, encryption
status, type of compression, version and operating system
of compressing program, and the like. The default option
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is to list files in the following format:
-rw-rwl--- 1.5 unx 2802 t- defX 11-Aug-91 13:48 perms.2660
The last three fields are clearly the modification date
and time of the file, and its name. The case of the file-
name is respected; thus files which come from MS-DOS PKZIP
are always capitalized. If the file was zipped with a
stored directory name, that is also displayed as part of
the filename.
The second and third fields indicate that the file was
zipped under Unix with version 1.5 of Zip (a beta ver-
sion). Since it comes from Unix, the file permissions at
the beginning of the line are printed in Unix format. The
uncompressed file-size (2802 in this example) is the
fourth field.
The fifth field consists of two characters, either of
which may take on several values. The first character may
be either `t' or `b', indicating that Zip believes the
file to be text or binary, respectively; but if the file
is encrypted, ZipInfo notes this fact by capitalizing the
character (`T' or `B'). The second character may also
take on four values, depending on whether there is an
extended local header and/or an ``extra field'' associated
with the file (explained in PKWare's APPNOTE.TXT). If
neither exists, the character will be a hyphen (`-'); if
there is an extended local header but no extra field, `l';
if the reverse, `x'; and if both exist, `X'. Thus the
file in this example is (apparently) a text file, is not
encrypted, and has neither an extra field nor an extended
local header associated with it. The example below, on
the other hand, is an encrypted binary file with an extra
field:
RWD,R,R 0.9 vms 168 Bx shrk 9-Aug-91 19:15 perms.0644
Extra fields are used by PKWare for authenticity verifica-
tion(?) and possibly other purposes, and by Info-ZIP's Zip
1.6 and later to store OS/2, Macintosh and VMS file
attributes. This example presumably falls into the latter
class, then. Note that the file attributes are listed in
VMS format. Other possibilities for the host operating
system include OS/2 with High Performance File System
(HPFS), DOS or OS/2 with File Allocation Table (FAT) file
system, and Macintosh, denoted as follows:
arc,,rw, 1.0 os2 5358 Tl i4:3 4-Dec-91 11:33 longfilename.hpfs
arc,hid,rdo,sys dos 4096 b- i4:2 14-Jul-91 12:58 EA DATA. SF
--w------- 1.0 mac 17357 bx i8:2 4-May-92 04:02 unzip.macr
File attributes in the first two cases are indicated in a
DOS-like format, where the file may or may not have its
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ZIPINFO(1) ZIPINFO(1)
archive bit set; may be hidden or not; may be read-write
or read-only; and may be a system file or not. If the
attributes are too long, the version number of the encod-
ing software is omitted. (The information is still avail-
able in the verbose listing, however.) Interpretation of
Macintosh file attributes needs some work yet.
Finally, the sixth field indicates the compression method
and possible sub-method used. There are six methods known
at present: storing (no compression), reducing, shrink-
ing, imploding, tokenizing, and deflating. In addition,
there are four levels of reducing (1 through 4); four
types of imploding (4K or 8K sliding dictionary, and 2 or
3 Shannon-Fano trees); and three levels of deflating
(fast, normal, maximum compression). ZipInfo represents
these methods and their sub-methods as follows: ``stor'';
``re:1,'' ``re:2,'' etc.; ``shrk''; ``i4:2,'' ``i8:3,''
etc.; ``tokn''; and ``defF,'' ``defN,'' and ``defX.''
The medium and long listings are almost identical to the
short format except that they add information on the
file's compression. The medium format indicates the
file's compression factor as a percentage:
-rw-rwl--- 1.5 unx 2802 t- 81% defX 11-Aug-91 13:48 perms.2660
In this example, the file has been compressed by more than
a factor of five; the compressed data are only 19% of the
original size. The long format gives the compressed
file's size in bytes, instead:
-rw-rwl--- 1.5 unx 2802 t- 538 defX 11-Aug-91 13:48 perms.2660
In addition to individual file information, a default zip-
file listing also includes header and trailer lines:
Archive: OS2.zip 5453 bytes 5 files
,,rw, 1.0 os2 730 b- i4:3 26-Jun-92 23:40 Contents
,,rw, 1.0 os2 3710 b- i4:3 26-Jun-92 23:33 makefile.os2
,,rw, 1.0 os2 8753 b- i8:3 26-Jun-92 15:29 os2unzip.c
,,rw, 1.0 os2 98 b- stor 21-Aug-91 15:34 unzip.def
,,rw, 1.0 os2 95 b- stor 21-Aug-91 17:51 zipinfo.def
5 files, 13386 bytes uncompressed, 4951 bytes compressed: 63%
The header line gives the name of the archive, its total
size, and the total number of files; the trailer gives the
number of files listed, their total uncompressed size, and
their total compressed size (not including any of Zip's
internal overhead). If, however, one or more filespecs
are provided, the header and trailer lines are not listed.
This behavior is also similar to that of Unix's ``ls -l'';
it may be overridden by specifying the -h and -t options
explicitly. In such a case the listing format must also
be specified explicitly, since -h or -t (or both) in the
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absence of other options implies that ONLY the header or
trailer line (or both) is listed. See the EXAMPLES sec-
tion below for a semi-intelligible translation of this
nonsense.
The verbose listing is self-explanatory. It also lists
file comments and the zipfile comment, if any, and the
number of bytes of OS/2 extended attributes stored. Note
that the latter number will in general NOT match the num-
ber given by OS/2's ``dir'' command; OS/2 always reports
the number of bytes required in 16-bit format, whereas
ZipInfo always reports the 32-bit storage.
ENVIRONMENT OPTIONS
Modifying ZipInfo's default behavior via options placed in
an environment variable can be a bit complicated to
explain, due to ZipInfo's attempts to handle various
defaults in an intuitive, yet Unix-like, manner. Never-
theless, there is some underlying logic. In brief, there
are three ``priority levels'' of options: the default
options; environment options, which can override or add to
the defaults; and explicit options given by the user,
which can override or add to either of the above.
The default listing format, as noted above, corresponds
roughly to the "zipinfo -hst" command (except when indi-
vidual zipfile members are specified). A user who prefers
the long-listing format (-l) can make use of the ZIPINFO
environment variable to change this default:
setenv ZIPINFO -l Unix C shell
ZIPINFO=-l; export ZIPINFO Unix Bourne shell
set ZIPINFO=-l OS/2 or MS-DOS
define ZIPINFO_OPTS "-l" VMS (quotes for LOWER-
CASE)
If, in addition, the user dislikes the trailer line, Zip-
Info's concept of ``negative options'' may be used to
override the default inclusion of the line. This is
accomplished by preceding the undesired option with one or
more minuses: e.g., ``-l-t'' or ``--tl'', in this exam-
ple. The first hyphen is the regular switch character,
but the one before the `t' is a minus sign. The dual use
of hyphens may seem a little awkward, but it's reasonably
intuitive nonetheless: simply ignore the first hyphen and
go from there. It is also consistent with the behavior of
the Unix command nice(1).
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EXAMPLES
To get a basic, short-format listing of the complete con-
tents of a ZIP archive ``storage.zip,'' with both header
and totals lines, use only the archive name as an argument
to zipinfo:
zipinfo storage
To produce a basic, long-format listing (not verbose),
including header and totals lines, use -l:
zipinfo -l storage
To list the complete contents of the archive without
header and totals lines, either negate the -h and -t
options or else specify the contents explicitly:
zipinfo --h-t storage
zipinfo storage \*
(where the backslash is required only if the shell would
otherwise expand the `*' wildcard, as in Unix when glob-
bing is turned on--double quotes around the asterisk would
have worked as well). To turn off the totals line by
default, use the environment variable (C shell is assumed
here):
setenv ZIPINFO --t
zipinfo storage
To get the full, short-format listing of the first example
again, given that the environment variable is set as in
the previous example, it is necessary to specify the -s
option explicitly, since the -t option by itself implies
that ONLY the footer line is to be printed:
setenv ZIPINFO --t
zipinfo -t storage [only totals line]
zipinfo -st storage [full listing]
The -s option, like -m and -l, includes headers and foot-
ers by default, unless otherwise specified. Since the
environment variable specified no footers and that has a
higher precedence than the default behavior of -s, an
explicit -t option was necessary to produce the full
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listing. Nothing was indicated about the header, however,
so the -s option was sufficient. Note that both the -h
and -t options, when used by themselves or with each
other, override any default listing of member files; only
the header and/or footer are printed. This behavior will
be more useful when ZipInfo accepts wildcards for the zip-
file name; one may then summarize the contents of all zip-
files with a single command.
To list information on a single file within the archive,
in medium format, specify the filename explicitly:
zipinfo -m storage unshrink.c
The specification of any member file, as in this example,
will override the default header and totals lines; only
the single line of information about the requested file
will be printed. This is intuitively what one would
expect when requesting information about a single file.
For multiple files, it is often useful to know the total
compressed and uncompressed size; in such cases -t may be
specified explicitly:
zipinfo -mt storage "*.[ch] Mak\*
Finally, to get maximal information about the ZIP archive,
use the verbose option. It is usually wise to pipe the
output into a filter such as more(1):
zipinfo -v storage | more
TIPS
The author finds it convenient to set up an alias ``ii''
for ZipInfo on systems which allow aliases, or else to set
up a batch file ``ii.bat'' or to rename the executable to
``ii.exe'' on systems such as MS-DOS which have no provi-
sion for aliases. The ``ii'' usage parallels the common
``ll'' alias for long listings in Unix, and the similarity
between the outputs of the two commands was intentional.
SEE ALSO
funzip(1), unzip(1), zip(1), zipcloak(1), zipnote(1), zip-
split(1)
AUTHOR
Greg Roelofs (also known as Cave Newt). ZipInfo is partly
based on S. H. Smith's unzip and contains pattern-matching
code by J. Kercheval, but mostly it was written from
scratch. The OS/2 extra-field code is by Kai Uwe Rommel.
19 Aug 92 (v1.0) 6