Open Source Software

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
   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
   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)



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