man pages section 1: User Commands

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Updated: July 2014

funzip (1)


funzip - filter for extracting from a ZIP archive in a pipe


funzip [-password] [input[.zip|.gz]]


Misc. Reference Manual Pages                           FUNZIP(1L)

     funzip - filter for extracting from a ZIP archive in a pipe

     funzip [-password] [input[.zip|.gz]]

          Optional   password  to  be  used  if  ZIP  archive  is
          encrypted.  Decryption may not  be  supported  at  some
          sites.  See DESCRIPTION for more details.

          Optional input archive file specification. See DESCRIP-
          TION for details.

     funzip without a file argument acts as a filter; that is, it
     assumes  that  a  ZIP archive (or a gzip'd(1) file) is being
     piped into standard input, and it extracts the first  member
     from  the  archive  to  stdout.  When stdin comes from a tty
     device, funzip assumes that  this  cannot  be  a  stream  of
     (binary)  compressed  data  and  shows  a  short  help text,
     instead.  If there is a file argument, then  input  is  read
     from the specified file instead of from stdin.

     A  password  for encrypted zip files can be specified on the
     command line (preceding the file name, if any) by  prefixing
     the  password  with  a  dash.   Note that this constitutes a
     security risk on many systems; currently  running  processes
     are  often  visible  via  simple commands (e.g., ps(1) under
     Unix), and command-line histories can be read.  If the first
     entry of the zip file is encrypted and no password is speci-
     fied on the command line, then the user is  prompted  for  a
     password and the password is not echoed on the console.

     Given  the limitation on single-member extraction, funzip is
     most useful in conjunction with a secondary archiver program
     such  as  tar(1).  The following section includes an example
     illustrating this usage in the case of disk backups to tape.

     To  use  funzip  to extract the first member file of the ar-
     chive and to pipe it into more(1):

         funzip | more

     To use funzip to test the first member file of (any
     errors will be reported on standard error):

         funzip > /dev/null

Info-ZIP        Last change: 20 April 2009 (v3.95)              1

Misc. Reference Manual Pages                           FUNZIP(1L)

     To  use  zip  and funzip in place of compress(1) and zcat(1)
     (or gzip(1L) and gzcat(1L)) for tape backups:

         tar cf - . | zip -7 | dd of=/dev/nrst0 obs=8k
         dd if=/dev/nrst0 ibs=8k | funzip | tar xf -

     (where, for example, nrst0 is a SCSI tape drive).

     When piping an encrypted file into more and allowing  funzip
     to  prompt for password, the terminal may sometimes be reset
     to a non-echo mode.  This is apparently due to a race condi-
     tion  between  the two programs; funzip changes the terminal
     mode to non-echo before more reads its state, and more  then
     ``restores''  the  terminal to this mode before exiting.  To
     recover, run  funzip  on  the  same  file  but  redirect  to
     /dev/null  rather  than  piping  into  more; after prompting
     again for the password, funzip will reset the terminal prop-

     There  is  presently  no  way  to extract any member but the
     first from a ZIP archive.  This would be useful in the  case
     where  a ZIP archive is included within another archive.  In
     the case where the first member is a directory, funzip  sim-
     ply creates the directory and exits.

     The  functionality  of  funzip  should  be incorporated into
     unzip itself (future release).

     See  attributes(5)  for  descriptions   of   the   following

     |Availability   | compress/unzip   |
     |Stability      | Volatile         |
     gzip(1L),  unzip(1L),  unzipsfx(1L),  zip(1L), zipcloak(1L),
     zipinfo(1L), zipnote(1L), zipsplit(1L)

     The Info-ZIP home page is currently at
     or .

Info-ZIP        Last change: 20 April 2009 (v3.95)              2

Misc. Reference Manual Pages                           FUNZIP(1L)

     Mark Adler (Info-ZIP)

     This  software  was   built   from   source   available   at    The  original
     community  source  was  downloaded   from

     Further  information about this software can be found on the
     open   source   community   website   at

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