unzip.txt

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              this format. When extracting to standard output (-c
              or  -p option in effect), the default conversion of
              text record delimiters is disabled for binary  (-b)
              resp. all (-bb) files.

       -B     [Unix  only,  and  only if compiled with UNIXBACKUP
              defined] save a backup  copy  of  each  overwritten
              file  with  a tilde appended (e.g., the old copy of
              ``foo'' is renamed to ``foo~'').  This  is  similar
              to  the  default behavior of emacs(1) in many loca-
              tions.

       -C     use case-insensitive matching for the selection  of
              archive  entries  from  the  command-line  list  of
              extract selection patterns.  unzip's philosophy  is
              ``you  get what you ask for'' (this is also respon-
              sible  for  the  -L/-U  change;  see  the  relevant
              options  below).   Because  some  file  systems are
              fully case-sensitive (notably those under the  Unix
              operating system) and because both ZIP archives and
              unzip itself are portable across platforms, unzip's
              default behavior is to match both wildcard and lit-
              eral filenames case-sensitively.  That is, specify-
              ing  ``makefile''  on  the  command  line will only

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UNZIP(1L)                                               UNZIP(1L)

              match ``makefile'' in the archive, not ``Makefile''
              or  ``MAKEFILE'' (and similarly for wildcard speci-
              fications).  Since this does not correspond to  the
              behavior  of many other operating/file systems (for
              example, OS/2 HPFS, which preserves mixed case  but
              is  not sensitive to it), the -C option may be used
              to force all filename matches to  be  case-insensi-
              tive.   In the example above, all three files would
              then match ``makefile'' (or ``make*'', or similar).
              The -C option affects file specs in both the normal
              file list and the excluded-file list (xlist).

              Please note that the -L option does neither  affect
              the  search  for the zipfile(s) nor the matching of
              archive entries to existing files on the extraction
              path.   On a case-sensitive file system, unzip will
              never try to overwrite a file ``FOO'' when extract-
              ing an entry ``foo''!

       -E     [MacOS  only] display contents of MacOS extra field
              during restore operation.

       -F     [Acorn  only]  suppress  removal  of  NFS  filetype
              extension from stored filenames.

       -F     [non-Acorn  systems  supporting long filenames with
              embedded  commas,  and  only   if   compiled   with
              ACORN_FTYPE_NFS  defined] translate filetype infor-
              mation from ACORN RISC OS extra field blocks into a
              NFS  filetype  extension and append it to the names
              of the extracted files.  (When the stored  filename
              appears  to  already  have an appended NFS filetype
              extension, it is replaced  by  the  info  from  the
              extra field.)

       -i     [MacOS only] ignore filenames stored in MacOS extra
              fields.  Instead,  the  most  compatible   filename
              stored in the generic part of the entry's header is
              used.

       -j     junk paths.  The archive's directory  structure  is
              not  recreated;  all  files  are  deposited  in the
              extraction directory (by default, the current one).

       -J     [BeOS  only] junk file attributes.  The file's BeOS
              file attributes are not restored, just  the  file's
              data.

       -J     [MacOS only] ignore MacOS extra fields.  All Macin-
              tosh  specific  info  is  skipped.  Data-fork   and
              resource-fork are restored as separate files.

       -K     [AtheOS,  BeOS,  Unix  only] retain SUID/SGID/Tacky
              file  attributes.    Without   this   flag,   these

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UNZIP(1L)                                               UNZIP(1L)

              attribute bits are cleared for security reasons.

       -L     convert to lowercase any filename originating on an
              uppercase-only operating  system  or  file  system.
              (This  was  unzip's  default  behavior  in releases
              prior to 5.11; the new default behavior is  identi-
              cal  to  the old behavior with the -U option, which
              is now obsolete and will be  removed  in  a  future
              release.)    Depending   on   the  archiver,  files
              archived under single-case file systems  (VMS,  old
              MS-DOS  FAT,  etc.)  may be stored as all-uppercase
              names;  this  can  be  ugly  or  inconvenient  when
              extracting to a case-preserving file system such as
              OS/2 HPFS or a case-sensitive  one  such  as  under
              Unix.   By  default  unzip  lists and extracts such
              filenames  exactly  as  they're  stored  (excepting
              truncation,  conversion  of unsupported characters,
              etc.); this option causes the names  of  all  files
              from  certain systems to be converted to lowercase.
              The -LL option forces conversion of every  filename
              to  lowercase,  regardless  of the originating file
              system.

       -M     pipe all output through an internal  pager  similar
              to  the  Unix  more(1)  command.   At  the end of a
              screenful  of   output,   unzip   pauses   with   a
              ``--More--''  prompt;  the  next  screenful  may be
              viewed by pressing the Enter (Return)  key  or  the
              space bar.  unzip can be terminated by pressing the
              ``q'' key and, on some  systems,  the  Enter/Return
              key.   Unlike  Unix  more(1),  there is no forward-
              searching  or  editing  capability.   Also,   unzip
              doesn't  notice  if  long lines wrap at the edge of
              the screen, effectively resulting in  the  printing
              of  two  or more lines and the likelihood that some
              text will scroll off the top of the  screen  before
              being viewed.  On some systems the number of avail-
              able lines on the screen is not detected, in  which
              case unzip assumes the height is 24 lines.

       -n     never  overwrite existing files.  If a file already
              exists, skip the extraction of  that  file  without
              prompting.    By   default   unzip  queries  before
              extracting any file that already exists;  the  user
              may  choose  to  overwrite  only  the current file,
              overwrite all files, skip extraction of the current
              file,  skip  extraction  of  all existing files, or
              rename the current file.

       -N     [Amiga] extract file comments as  Amiga  filenotes.
              File  comments  are  created  with the -c option of
              zip(1L), or with the -N option of the Amiga port of
              zip(1L), which stores filenotes as comments.

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UNZIP(1L)                                               UNZIP(1L)

       -o     overwrite  existing  files without prompting.  This
              is a dangerous option, so use it with care.  (It is
              often used with -f, however, and is the only way to
              overwrite directory EAs under OS/2.)

       -P password
              use password to decrypt encrypted  zipfile  entries
              (if any).  THIS IS INSECURE!  Many multi-user oper-
              ating systems provide ways for any user to see  the
              current  command  line  of  any other user; even on
              stand-alone systems there is always the  threat  of
              over-the-shoulder  peeking.   Storing the plaintext
              password as part of a command line in an  automated
              script  is  even worse.  Whenever possible, use the
              non-echoing, interactive prompt to enter passwords.
              (And  where security is truly important, use strong
              encryption such as Pretty Good Privacy  instead  of
              the relatively weak encryption provided by standard
              zipfile utilities.)

       -q     perform operations quietly (-qq  =  even  quieter).
              Ordinarily unzip prints the names of the files it's
              extracting or testing, the extraction methods,  any
              file  or zipfile comments that may be stored in the
              archive, and possibly a summary when finished  with
              each  archive.   The  -q[q]  options  suppress  the
              printing of some or all of these messages.

       -s     [OS/2, NT, MS-DOS] convert spaces in  filenames  to
              underscores.   Since all PC operating systems allow
              spaces in  filenames,  unzip  by  default  extracts
              filenames     with     spaces     intact     (e.g.,
              ``EA DATA. SF'').  This can  be  awkward,  however,
              since MS-DOS in particular does not gracefully sup-
              port spaces in filenames.  Conversion of spaces  to
              underscores  can  eliminate the awkwardness in some
              cases.

       -U     (obsolete; to be removed in a future release) leave
              filenames  uppercase  if created under MS-DOS, VMS,
              etc.  See -L above.

       -V     retain (VMS) file version numbers.  VMS  files  can
              be  stored  with  a  version  number, in the format
              file.ext;##.  By default the ``;##''  version  num-
              bers  are  stripped, but this option allows them to
              be retained.  (On file systems that limit filenames
              to  particularly short lengths, the version numbers
              may be truncated or  stripped  regardless  of  this
              option.)

       -W     [only  when  WILD_STOP_AT_DIR  compile-time  option
              enabled] modifies the pattern matching  routine  so
              that   both  `?'  (single-char  wildcard)  and  `*'

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UNZIP(1L)                                               UNZIP(1L)

              (multi-char wildcard) do not  match  the  directory
              separator   character   `/'.    (The  two-character
              sequence ``**'' acts as a multi-char wildcard  that
              includes  the  directory  separator  in its matched
              characters.)  Examples:

               "*.c" matches "foo.c" but not "mydir/foo.c"
               "**.c" matches both "foo.c" and "mydir/foo.c"
               "*/*.c" matches "bar/foo.c" but not "baz/bar/foo.c"
               "??*/*" matches "ab/foo" and "abc/foo"
                       but not "a/foo" or "a/b/foo"

              This modified behaviour is equivalent to  the  pat-
              tern  matching  style used by the shells of some of
              UnZip's supported target OSs (one example is  Acorn
              RISC OS).  This option may not be available on sys-
              tems where the Zip archive's interal directory sep-
              arator  character `/' is allowed as regular charac-
              ter in native operating  system  filenames.   (Cur-
              rently,  UnZip uses the same pattern matching rules
              for both wildcard zipfile  specifications  and  zip
              entry  selection  patterns in most ports.  For sys-
              tems allowing `/' as  regular  filename  character,
              the -W option would not work as expected on a wild-
              card zipfile specification.)

       -X     [VMS, Unix, OS/2, NT] restore owner/protection info
              (UICs)  under VMS, or user and group info (UID/GID)
              under Unix, or access control  lists  (ACLs)  under
              certain  network-enabled  versions  of  OS/2  (Warp
              Server with IBM LAN Server/Requester  3.0  to  5.0;
              Warp  Connect  with IBM Peer 1.0), or security ACLs
              under Windows NT.  In most cases this will  require
              special  system privileges, and doubling the option
              (-XX) under NT instructs unzip  to  use  privileges
              for extraction; but under Unix, for example, a user
              who belongs to several  groups  can  restore  files
              owned  by  any of those groups, as long as the user
              IDs match his or her own.  Note that ordinary  file
              attributes are always restored--this option applies
              only to optional, extra ownership info available on
              some operating systems.  [NT's access control lists
              do not appear  to  be  especially  compatible  with
              OS/2's,  so  no  attempt  is made at cross-platform
              portability of access privileges.  It is not  clear
              under  what  conditions  this  would ever be useful
              anyway.]

       -$     [MS-DOS, OS/2, NT] restore the volume label if  the
              extraction  medium is removable (e.g., a diskette).
              Doubling the option (-$$) allows fixed media  (hard
              disks)  to be labelled as well.  By default, volume
              labels are ignored.

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UNZIP(1L)                                               UNZIP(1L)

       -/ extensions
              [Acorn only] overrides the extension list  supplied
              by  Unzip$Ext  environment variable. During extrac-
              tion, filename extensions that  match  one  of  the
              items  in  this extension list are swapped in front
              of the base name of the extracted file.