funzip man page on Tru64

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FUNZIP(1L)							    FUNZIP(1L)

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

SYNOPSIS
       [...]  |	 funzip [-password]  |	[...]

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

DESCRIPTION
       funzip 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.	 If there is an argument, then
       the input comes from the specified file instead of from stdin.  A pass‐
       word for encrypted zip files can be specified on the command line (pre‐
       ceding  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(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   ftp://ftp.info-
       zip.org/pub/infozip/ .

AUTHOR
       Mark Adler (Info-ZIP)

Info-ZIP		     16 April 2000 (v3.93)		    FUNZIP(1L)
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