zipinfo.txt

zip压缩

       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.
       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.

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ZIPINFO(1L)                                           ZIPINFO(1L)

       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.)

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

       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

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ZIPINFO(1L)                                           ZIPINFO(1L)

       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), ZIPIN-
       FOOPT 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.

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

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ZIPINFO(1L)                                           ZIPINFO(1L)

       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
       sorting utility such as Unix sort(1) (and tail(1) as well,
       in this example):

           zipinfo -T storage | sort -n +6 | tail -15

       The  -n  option  to  sort(1)  tells it to sort numerically
       rather than in ASCII order, and the +6 option tells it  to
       sort  on  the  sixth  field after the first one (i.e., the
       seventh field).  This assumes  the  default  short-listing
       format;  if  -m  or  -l is used, the proper sort(1) option
       would be +7.  The tail(1) command filters out all but  the
       last  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

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ZIPINFO(1L)                                           ZIPINFO(1L)

       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-
       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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