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; cur-
    rently 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(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 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(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)