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1998-11-21
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FUNZIP(1L) FUNZIP(1L)
NAME
funzip - filter for extracting from a ZIP archive in a
pipe
SYNOPSIS
[...] | funzip [-password] | [...]
funzip [-password] input.zip | [...] funzip [-password]
input.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.
DESCRIPTION
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 secu-
rity 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 back-
ups 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(1L) and gzcat(1L)) for tape backups:
tar cf - . | zip -7 | dd of=/dev/nrst0 obs=8k
Info-ZIP 21 November 1998 (v3.93) 1
FUNZIP(1L) FUNZIP(1L)
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 fun-
zip 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 direc-
tory, funzip simply creates the directory and exits.
The functionality of funzip should be incorporated into
unzip itself (future release).
SEE ALSO
gzip(1L), unzip(1L), unzipsfx(1L), zip(1L), zipcloak(1L),
zipinfo(1L), zipnote(1L), zipsplit(1L)
URL
The Info-ZIP home page is currently at
http://www.cdrom.com/pub/infozip/ .
AUTHOR
Mark Adler (Info-ZIP)
Info-ZIP 21 November 1998 (v3.93) 2