funzip(1)

FUNZIP(1L)        MISC. REFERENCE MANUAL PAGES         FUNZIP(1L)

NAME

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

SYNOPSIS

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

     [input[.zip|.gz]]
          Optional input archive file specification. See DESCRIP-
          TION for details.

DESCRIPTION

     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.

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

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

FUNZIP(1L)        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).

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.info-zip.org/pub/infozip/
     or
         ftp://ftp.info-zip.org/pub/infozip/ .

AUTHOR

     Mark Adler (Info-ZIP)

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