zipinfo.txt

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       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 zip-
       file listing also includes header and trailer lines:

  Archive:  OS2.zip   5453 bytes   5 files
  ,,rw,       1.0 hpf     730 b- i4:3 26-Jun-92 23:40 Contents
  ,,rw,       1.0 hpf    3710 b- i4:3 26-Jun-92 23:33 makefile.os2
  ,,rw,       1.0 hpf    8753 b- i8:3 26-Jun-92 15:29 os2unzip.c
  ,,rw,       1.0 hpf      98 b- stor 21-Aug-91 15:34 unzip.def
  ,,rw,       1.0 hpf      95 b- stor 21-Aug-91 17:51 zipinfo.def
  5 files, 13386 bytes uncompressed, 4951 bytes compressed:  63.0%

       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.

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ZIPINFO(1L)                                           ZIPINFO(1L)

       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  sec-
       tion  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 for-
       mat, 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.

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.  (Try not
       to  laugh.)  Nevertheless, there is some underlying logic.
       In brief, there are three ``priority levels'' of  options:
       the  default options; environment options, which can over-
       ride 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's
       environment variable to change this default:

       Unix Bourne shell:
              ZIPINFO=-l; export ZIPINFO

       Unix C shell:
              setenv ZIPINFO -l

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ZIPINFO(1L)                                           ZIPINFO(1L)

       OS/2 or MS-DOS:
              set ZIPINFO=-l

       VMS (quotes for lowercase):
              define ZIPINFO_OPTS "-l"

       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).

       As suggested above, the default variable  names  are  ZIP-
       INFO_OPTS  for  VMS (where the symbol used to install zip-
       info as a foreign command would otherwise be confused with
       the environment variable), and ZIPINFO for all other oper-
       ating systems.  For compatibility with zip(1L), ZIPINFOOPT
       is  also accepted (don't ask).  If both ZIPINFO and ZIPIN-
       FOOPT 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.

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

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ZIPINFO(1L)                                           ZIPINFO(1L)

       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 list-
       ing.   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  specifica-
       tion;  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

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ZIPINFO(1L)                                           ZIPINFO(1L)

       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 ver-
       sions 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.

TIPS
       The author finds it convenient to define an alias  ii  for
       zipinfo  on  systems that allow aliases (or, on other sys-
       tems, copy/rename the executable, create a link or  create
       a  command file with the name ii).  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.

BUGS
       As with unzip, zipinfo'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.  zipinfo 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, zipinfo should detect
       the true screen geometry on all systems.

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

SEE ALSO
       ls(1), funzip(1L), unzip(1L), unzipsfx(1L), zip(1L),  zip-
       cloak(1L), zipnote(1L), zipsplit(1L)

URL
       The Info-ZIP home page is currently at
           http://www.info-zip.org/pub/infozip/
       or
           ftp://ftp.info-zip.org/pub/infozip/ .

AUTHOR
       Greg  ``Cave  Newt''  Roelofs.   ZipInfo contains pattern-

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ZIPINFO(1L)                                           ZIPINFO(1L)

       matching code by Mark Adler and fixes/improvements by many
       others.   Please  refer  to the CONTRIBS file in the UnZip
       source distribution for a more complete list.

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