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 DESCRIPTION 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 specified
       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

       To use zip and funzip in place of compress(1) and zcat(1) (or gzip(1) and gzcat(1)) 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 condition 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 properly.

       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 simply creates the directory and exits.

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

SEE ALSO

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

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                                      20 April 2009 (v3.95)                                    FUNZIP(1)