funzip(1) - man - phpMan

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 sup‐
              ported 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  illus‐
       trating 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 stan‐
       dard 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  ter‐
       minal  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 prompt‐
       ing 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)



Info-ZIP                                20 April 2009 (v3.95)                              FUNZIP(1)