Manual: funzip

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 (bi‐
       nary) 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	sys‐
       tems; 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 sec‐
       ondary 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 er‐
       ror):

       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 use‐
       ful  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)