FUNZIP(1L)							   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 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 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 use-
       ful 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)



Info-ZIP		     22 May 2004 (v3.94)		   FUNZIP(1L)

UNIX/Linux commands referenced on this page:

1. at
2. more
3. file
4. as
5. tty
6. zip
7. test
8. tar
9. dd
10. reset
11. unzip