funzip - filter for extracting from a ZIP archive in a pipe
funzip [-password] [archive[.zip|.gz]]
FUNZIP(1) General Commands Manual FUNZIP(1)
NAME
funzip - filter for extracting from a ZIP archive in a pipe
SYNOPSIS
funzip [-password] [archive[.zip|.gz]]
ARGUMENTS
[-password]
Optional password to be used if ZIP archive is encrypted.
Encryption support can be disabled at build time. See DESCRIP-
TION for more details.
[archive[.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 (non-directory) member from the ar-
chive to standard output (stdout). When standard input (stdin) is a
terminal (tty) device, fUnZip assumes that this cannot be a stream of
(binary) compressed data and shows a short usage guide, 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
hyphen. Note that this constitutes a security risk on many systems;
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
Use fUnZip to extract the first (non-directory) member of the archive
"test.zip", and to pipe it into more(1):
funzip test.zip | more
Use fUnZip to test the first (non-directory) member of "test.zip" (with
any error messages sent to standard error (stderr)):
funzip test.zip > /dev/null
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 exit-
ing. 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 should reset the terminal properly.
There is no way to extract any member except the first (non-directory)
from a ZIP archive, but fUnZip will skip archive members which are
directories, and extract the first member which is not a directory.
Only Deflate compression and Traditional ZIP encryption are supported.
The functionality of fUnZip should be incorporated into UnZip itself
(in some future release).
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+------------------+
|Availability | compress/unzip |
+---------------+------------------+
|Stability | Volatile |
+---------------+------------------+
SEE ALSO
gzip(1L), unzip(1L), unzipsfx(1L), zip(1L), zipcloak(1L), zipinfo(1L),
zipnote(1L), zipsplit(1L)
URL
The Info-ZIP main Web page is:
http://www.info-zip.org/
FTP access is available, too:
ftp://ftp.info-zip.org/pub/infozip/
AUTHOR
Mark Adler (Info-ZIP)
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from http://antinode.info/ftp/info-
zip/unzip610c25.zip.
Further information about this software can be found on the open source
community website at http://www.info-zip.org/UnZip.html.
Info-ZIP 06 Nov 2013 (v4.10) FUNZIP(1)