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funzip - filter for extracting from a ZIP archive in a pipe
[...] | funzip [-password] | [...]
funzip [-password] input.zip | [...] funzip
[-password] input.gz | [...]
- [-password]
- Optional password to be used
if ZIP archive is encrypted. Decryption may not be supported at some sites.
See DESCRIPTION for more details.
funzip 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. If there is an argument, then the input comes 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.
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(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).
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).
gzip(1L)
,
unzip(1L)
, unzipsfx(1L)
, zip(1L)
, zipcloak(1L)
, zipinfo(1L)
, zipnote(1L)
,
zipsplit(1L)
The Info-ZIP home page is currently at http://www.cdrom.com/pub/infozip/
.
Mark Adler (Info-ZIP)
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