xenial (1) funzip.1.gz

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)