man pages for funzip

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

SYNOPSIS
     [...]  |  funzip [-password]  |  [...]

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

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

DESCRIPTION
     funzip 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.   If there is an argument, then the input comes 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 specified on the com-
     mand 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.

EXAMPLES
     To use funzip to  extract  the  first  member  file  of  the
     archive test.zip and to pipe it into more(1):

         funzip test.zip | more

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

         funzip test.zip > /dev/null

     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).

BUGS
     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-
     erly.

     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 ALSO
     gzip(1L), unzip(1L),  unzipsfx(1L),  zip(1L),  zipcloak(1L),
     zipinfo(1L), zipnote(1L), zipsplit(1L)

URL
     The    Info-ZIP    home     page     is     currently     at
     http://www.cdrom.com/pub/infozip/ .

AUTHOR
     Mark Adler (Info-ZIP)