unzip.txt

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UNZIP(1L)                                               UNZIP(1L)

NAME
       unzip  -  list, test and extract compressed files in a ZIP
       archive

SYNOPSIS
       unzip  [-Z]   [-cflptTuvz[abjnoqsCKLMVWX$/:]]   file[.zip]
       [file(s) ...]  [-x xfile(s) ...] [-d exdir]

DESCRIPTION
       unzip  will  list,  test,  or  extract  files  from  a ZIP
       archive, commonly found on MS-DOS  systems.   The  default
       behavior  (with no options) is to extract into the current
       directory (and subdirectories below it) all files from the
       specified ZIP archive.  A companion program, zip(1L), cre-
       ates ZIP  archives;  both  programs  are  compatible  with
       archives created by PKWARE's PKZIP and PKUNZIP for MS-DOS,
       but in many cases the program options or default behaviors
       differ.

ARGUMENTS
       file[.zip]
              Path of the ZIP archive(s).  If the file specifica-
              tion is a wildcard, each matching file is processed
              in  an order determined by the operating system (or
              file system).  Only the filename can be a wildcard;
              the  path  itself cannot.  Wildcard expressions are
              similar to those supported in  commonly  used  Unix
              shells (sh, ksh, csh) and may contain:

              *      matches a sequence of 0 or more characters

              ?      matches exactly 1 character

              [...]  matches  any  single  character found inside
                     the brackets;  ranges  are  specified  by  a
                     beginning character, a hyphen, and an ending
                     character.  If an  exclamation  point  or  a
                     caret (`!' or `^') follows the left bracket,
                     then the  range  of  characters  within  the
                     brackets  is complemented (that is, anything
                     except the characters inside the brackets is
                     considered  a match).  To specify a verbatim
                     left bracket, the  three-character  sequence
                     ``[[]'' has to be used.

              (Be  sure  to quote any character that might other-
              wise be interpreted or modified  by  the  operating
              system,  particularly  under  Unix and VMS.)  If no
              matches are found, the specification is assumed  to
              be  a literal filename; and if that also fails, the
              suffix .zip is appended.  Note that self-extracting
              ZIP  files  are  supported,  as  with any other ZIP
              archive; just specify  the  .exe  suffix  (if  any)
              explicitly.

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UNZIP(1L)                                               UNZIP(1L)

       [file(s)]
              An  optional  list  of  archive  members to be pro-
              cessed, separated by spaces.   (VMS  versions  com-
              piled  with  VMSCLI defined must delimit files with
              commas instead.  See -v in OPTIONS below.)  Regular
              expressions (wildcards) may be used to match multi-
              ple members; see above.  Again, be  sure  to  quote
              expressions  that  would  otherwise  be expanded or
              modified by the operating system.

       [-x xfile(s)]
              An optional list of archive members to be  excluded
              from  processing.   Since  wildcard characters nor-
              mally match (`/') directory separators  (for  exep-
              tions see the option -W, this option may be used to
              exclude any files that are in subdirectories.   For
              example,  ``unzip foo *.[ch] -x */*'' would extract
              all C source files in the main directory, but  none
              in  any subdirectories.  Without the -x option, all
              C source files in all directories within  the  zip-
              file would be extracted.

       [-d exdir]
              An  optional  directory  to which to extract files.
              By default, all files and subdirectories are recre-
              ated in the current directory; the -d option allows
              extraction in an arbitrary directory (always assum-
              ing  one has permission to write to the directory).
              This option need not appear at the end of the  com-
              mand  line;  it is also accepted before the zipfile
              specification (with the  normal  options),  immedi-
              ately  after  the zipfile specification, or between
              the file(s) and the  -x  option.   The  option  and
              directory  may  be  concatenated  without any white
              space between them, but note that  this  may  cause
              normal shell behavior to be suppressed.  In partic-
              ular, ``-d ~'' (tilde) is expanded by Unix C shells
              into  the  name  of  the user's home directory, but
              ``-d~'' is treated as a literal subdirectory  ``~''
              of the current directory.

OPTIONS
       Note  that,  in  order  to  support  obsolescent hardware,
       unzip's usage screen is limited to  22  or  23  lines  and
       should  therefore  be  considered  only  a reminder of the
       basic unzip syntax rather than an exhaustive list  of  all
       possible flags.  The exhaustive list follows:

       -Z     zipinfo(1L)  mode.  If the first option on the com-
              mand line is -Z, the remaining options are taken to
              be zipinfo(1L) options.  See the appropriate manual
              page for a description of these options.

       -A     [OS/2, Unix DLL] print extended help for the  DLL's

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UNZIP(1L)                                               UNZIP(1L)

              programming interface (API).

       -c     extract  files  to  stdout/screen  (``CRT'').  This
              option is similar to the -p option except that  the
              name  of  each  file is printed as it is extracted,
              the -a option is allowed, and ASCII-EBCDIC  conver-
              sion  is  automatically  performed  if appropriate.
              This option  is  not  listed  in  the  unzip  usage
              screen.

       -f     freshen  existing  files,  i.e., extract only those
              files that already exist on disk and that are newer
              than  the  disk  copies.   By default unzip queries
              before overwriting, but the -o option may  be  used
              to  suppress  the  queries.   Note  that under many
              operating systems, the  TZ  (timezone)  environment
              variable  must be set correctly in order for -f and
              -u to work properly (under  Unix  the  variable  is
              usually  set  automatically).  The reasons for this
              are somewhat subtle but have to do with the differ-
              ences  between  DOS-format file times (always local
              time) and Unix-format times (always in GMT/UTC) and
              the  necessity  to  compare  the two.  A typical TZ
              value is ``PST8PDT'' (US Pacific  time  with  auto-
              matic  adjustment  for  Daylight  Savings  Time  or
              ``summer time'').

       -l     list archive  files  (short  format).   The  names,
              uncompressed  file sizes and modification dates and
              times of the specified  files  are  printed,  along
              with  totals for all files specified.  If UnZip was
              compiled with OS2_EAS defined, the -l  option  also
              lists columns for the sizes of stored OS/2 extended
              attributes (EAs)  and  OS/2  access  control  lists
              (ACLs).  In addition, the zipfile comment and indi-
              vidual file comments (if any) are displayed.  If  a
              file  was  archived  from a single-case file system
              (for example, the old MS-DOS FAT file  system)  and
              the  -L option was given, the filename is converted
              to lowercase and is prefixed with a caret (^).

       -p     extract files to pipe (stdout).   Nothing  but  the
              file  data  is  sent  to  stdout, and the files are
              always extracted in binary format, just as they are
              stored (no conversions).

       -t     test  archive  files.   This  option  extracts each
              specified file  in  memory  and  compares  the  CRC
              (cyclic  redundancy check, an enhanced checksum) of
              the expanded file with the original  file's  stored
              CRC value.

       -T     [most  OSes] set the timestamp on the archive(s) to
              that  of  the  newest  file  in  each  one.    This

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UNZIP(1L)                                               UNZIP(1L)

              corresponds  to zip's -go option except that it can
              be used on  wildcard  zipfiles  (e.g.,  ``unzip  -T
              \*.zip'') and is much faster.

       -u     update  existing  files  and  create  new  ones  if
              needed.  This option performs the same function  as
              the  -f  option, extracting (with query) files that
              are newer than those with the same  name  on  disk,
              and in addition it extracts those files that do not
              already exist on disk.  See -f above  for  informa-
              tion on setting the timezone properly.

       -v     be  verbose or print diagnostic version info.  This
              option has evolved  and  now  behaves  as  both  an
              option  and  a  modifier.   As an option it has two
              purposes:  when a  zipfile  is  specified  with  no
              other  options,  -v  lists archive files verbosely,
              adding to the basic -l info the compression method,
              compressed  size, compression ratio and 32-bit CRC.
              In contrast to most  of  the  competing  utilities,
              unzip  removes  the  12  additional header bytes of
              encrypted entries from the compressed size numbers.
              Therefore,  compressed  size  and compression ratio
              figures are independent of the  entry's  encryption
              status  and  show  the  correct compression perfor-
              mance.  (The complete size  of  the  encryped  com-
              pressed data stream for zipfile entries is reported
              by the more verbose zipinfo(1L)  reports,  see  the
              separate  manual.)   When  no  zipfile is specified
              (that is, the complete command  is  simply  ``unzip
              -v''), a diagnostic screen is printed.  In addition
              to the normal header with release date and version,
              unzip lists the home Info-ZIP ftp site and where to
              find a list of other ftp  and  non-ftp  sites;  the
              target  operating system for which it was compiled,
              as well as (possibly) the hardware on which it  was
              compiled,  the  compiler  and version used, and the
              compilation date; any special  compilation  options
              that might affect the program's operation (see also
              DECRYPTION below); and any options stored in  envi-
              ronment variables that might do the same (see ENVI-
              RONMENT OPTIONS below).  As a modifier it works  in
              conjunction  with  other options (e.g., -t) to pro-
              duce more verbose or debugging output; this is  not
              yet   fully  implemented  but  will  be  in  future
              releases.

       -z     display only the archive comment.

MODIFIERS
       -a     convert  text  files.   Ordinarily  all  files  are
              extracted exactly as they are stored (as ``binary''
              files).  The -a option causes files  identified  by
              zip  as  text  files  (those  with the `t' label in

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UNZIP(1L)                                               UNZIP(1L)

              zipinfo listings, rather than `b') to be  automati-
              cally  extracted  as such, converting line endings,
              end-of-file characters and the character set itself
              as  necessary.   (For  example, Unix files use line
              feeds (LFs) for end-of-line (EOL) and have no  end-
              of-file  (EOF)  marker;  Macintoshes  use  carriage
              returns (CRs) for EOLs; and most PC operating  sys-
              tems  use CR+LF for EOLs and control-Z for EOF.  In
              addition, IBM mainframes and the Michigan  Terminal
              System use EBCDIC rather than the more common ASCII
              character set, and NT supports Unicode.)  Note that
              zip's  identification  of text files is by no means
              perfect; some ``text'' files may actually be binary
              and  vice versa.  unzip therefore prints ``[text]''
              or ``[binary]'' as a visual check for each file  it
              extracts  when using the -a option.  The -aa option
              forces all files to be extracted as  text,  regard-
              less of the supposed file type.

       -b     [general]  treat  all files as binary (no text con-
              versions).  This is a shortcut for ---a.

       -b     [Tandem] force the  creation  files  with  filecode
              type  180  ('C') when extracting Zip entries marked
              as "text". (On Tandem, -a is  enabled  by  default,
              see above).

       -b     [VMS]  auto-convert  binary files (see -a above) to
              fixed-length, 512-byte record format.  Doubling the
              option  (-bb)  forces  all files to be extracted in