zipinfo - Unix, Linux Command

unzip -Z [-12smlvhMtTz] file[.zip]
[file(s) ...] [-x xfile(s) ...]




 .ti +2m
-rw-rws---  1.9 unx    2802 t- defX 11-Aug-91 13:48 perms.2660

 .ti -2m


The last three fields are the modification date and time of
the file, and its name.  The case of the filename is respected; thus
files that 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 1.9 of zip.  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 (fully explained in PKWare’s APPNOTE.TXT, but basically analogous to
pragmas in ANSI C--i.e., they provide a standard way to include non-standard
information in the archive).  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 (probably) 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:




 .ti +2m
RWD,R,R     0.9 vms     168 Bx shrk  9-Aug-91 19:15 perms.0644

 .ti -2m


Extra fields are used for various purposes (see discussion of the -v
option below) including the storage of VMS file attributes, which is
presumably the case here.  Note that the file attributes are listed in
VMS format.  Some other possibilities for the host operating system (which
is actually a misnomer--host file system is more correct) include
OS/2 or NT with High Performance File System (HPFS), MS-DOS, OS/2 or NT
with File Allocation Table (FAT) file system, and Macintosh.  These are
denoted as follows:




 .ti +2m
-rw-a--     1.0 hpf    5358 Tl i4:3  4-Dec-91 11:33 longfilename.hpfs

 .ti -2m


 .ti +2m
-r--ahs     1.1 fat    4096 b- i4:2 14-Jul-91 12:58 EA DATA. SF

 .ti -2m


 .ti +2m
--w-------  1.0 mac   17357 bx i8:2  4-May-92 04:02 unzip.macr

 .ti -2m


File attributes in the first two cases are indicated in a Unix-like format,
where the seven subfields indicate whether the file:  (1) is a directory,
(2) is readable (always true), (3) is writable, (4) is executable (guessed
on the basis of the extension--.exe, .com, .bat, .cmd
and .btm files are assumed to be so), (5) has its archive bit set,
(6) is hidden, and (7) is a system file.  Interpretation of Macintosh file
attributes is unreliable because some Macintosh archivers don’t store any
attributes in the archive.


Finally, the sixth field indicates
the compression method and possible sub-method used.  There are six methods
known at present:  storing (no compression), reducing, shrinking, imploding,
tokenizing (never publicly released), 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 four levels of
deflating (superfast, 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 defS, 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 lists
the file’s compression factor as a percentage indicating the amount of space
that has been ‘‘removed’’:




 .ti +2m
-rw-rws---  1.5 unx    2802 t- 81% defX 11-Aug-91 13:48 perms.2660

 .ti -2m


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:




 .ti +2m
-rw-rws---  1.5 unx    2802 t-     538 defX 11-Aug-91 13:48 perms.2660

 .ti -2m


In contrast to the unzip listings, the compressed size figures in
this listing format denote the complete size of compressed data, including
the 12 extra header bytes in case of encrypted entries.


Adding the -T option changes the file date and time to decimal
format:




 .ti +2m
-rw-rws---  1.5 unx    2802 t-     538 defX 910811.134804 perms.2660

 .ti -2m


Note that because of limitations in the MS-DOS format used to store file
times, the seconds field is always rounded to the nearest even second.
For Unix files this is expected to change in the next major releases of
zip(1L) and unzip.


In addition to individual file information, a default zipfile listing
also includes header and trailer lines:




 .ti +2m
Archive:  OS2.zip   5453 bytes   5 files

 .ti -2m


 .ti +2m
,,rw,       1.0 hpf     730 b- i4:3 26-Jun-92 23:40 Contents

 .ti -2m


 .ti +2m
,,rw,       1.0 hpf    3710 b- i4:3 26-Jun-92 23:33 makefile.os2

 .ti -2m


 .ti +2m
,,rw,       1.0 hpf    8753 b- i8:3 26-Jun-92 15:29 os2unzip.c

 .ti -2m


 .ti +2m
,,rw,       1.0 hpf      98 b- stor 21-Aug-91 15:34 unzip.def

 .ti -2m


 .ti +2m
,,rw,       1.0 hpf      95 b- stor 21-Aug-91 17:51 zipinfo.def

 .ti -2m


 .ti +2m
5 files, 13386 bytes uncompressed, 4951 bytes compressed:  63.0%

 .ti -2m


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 file(s) 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 absence of other options implies
that ONLY the header or trailer line (or both) is listed.  See the
EXAMPLES section below for a semi-intelligible translation of this
nonsense.


The verbose listing is mostly self-explanatory.  It also lists file
comments and the zipfile comment, if any, and the type and number of bytes
in any stored extra fields.  Currently known types of extra fields include
PKWARE’s authentication (‘‘AV’’) info; OS/2 extended attributes; VMS
filesystem info, both PKWARE and Info-ZIP versions; Macintosh resource
forks; Acorn/Archimedes SparkFS info; and so on.  (Note
that in the case of OS/2 extended attributes--perhaps the most common
use of zipfile extra fields--the size of the stored EAs as reported by
zipinfo may not match the number 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.)


Again, the compressed size figures of the individual entries include the
12 extra header bytes for encrypted entries.  In contrast, the archive total
compressed size and the average compression ratio shown in the summary
bottom line are calculated without the extra 12 header bytes of
encrypted entries.


The default listing format, as noted above, corresponds roughly
to the "zipinfo -hst" command (except when individual zipfile members
are specified).
A user who prefers the long-listing format (-l) can make use of the
zipinfo’s environment variable to change this default:


As suggested above, the default variable names are ZIPINFO_OPTS for VMS
(where the symbol used to install zipinfo as a foreign command
would otherwise be confused with the environment variable), and ZIPINFO
for all other operating systems.  For compatibility with zip(1L),
ZIPINFOOPT is also accepted (don’t ask).  If both ZIPINFO and ZIPINFOOPT
are defined, however, ZIPINFO 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.




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 globbing 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
footers 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 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 is useful when zipinfo is
used with a wildcard zipfile specification; the contents of all zipfiles
are then summarized 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\*


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
Unix more(1) if the operating system allows it:




zipinfo -v storage | more


Finally, to see the most recently modified files in the archive, use
the -T option in conjunction with an external sorting utility
such as Unix sort(1) (and sed(1) as well, in this example):




zipinfo -T storage | sort -nr -k 7 | sed 15q


The -nr option to sort(1) tells it to sort numerically
in reverse order rather than in textual order, and the -k 7 option
tells it to sort on the seventh field.  This
assumes the default short-listing format; if -m or -l is
used, the proper sort(1) option would be -k 8.
Older versions of sort(1) do not support the -k option,
but you can use the traditional + option instead, e.g.,
+6 instead of -k 7.  The sed(1)
command filters out all but the first 15 lines of the listing.  Future
releases of zipinfo may incorporate date/time and filename sorting
as built-in options.


zipinfo’s listing-format behavior is unnecessarily complex and should
be simplified.  (This is not to say that it will be.)



http://www.info-zip.org/pub/infozip/

ftp://ftp.info-zip.org/pub/infozip/ .


Advertisements


    129 Lectures 
     23 hours 

 Eduonix Learning Solutions

    5 Lectures 
     4.5 hours 

 Frahaan Hussain

    35 Lectures 
     2 hours 

 Pradeep D

    41 Lectures 
     2.5 hours 

 Musab Zayadneh

    46 Lectures 
     4 hours 

 GUHARAJANM

    6 Lectures 
     4 hours 

 Uplatz
 Print
 Add Notes
 Bookmark this page