FUNZIP(1)                                                     General Commands Manual                                                    FUNZIP(1)

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 speci-
       fied 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)