FUNZIP(1L) UNIX Programmer's Manual FUNZIP(1L)NAMEfunzip - filter for extracting from a ZIP archive in a pipe
SYNOPSISfunzip [-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 DESCRIP-
TION for details.
DESCRIPTIONfunzip 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 dev-
ice, 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 speci-
fied 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 speci-
fied 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
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FUNZIP(1L) UNIX Programmer's Manual FUNZIP(1L)
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).
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 condi-
tion 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 prop-
erly.
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 sim-
ply creates the directory and exits.
The functionality of funzip should be incorporated into
unzip itself (future release).
SEE ALSOgzip(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.info-zip.org/pub/infozip/
or
ftp://ftp.info-zip.org/pub/infozip/ .
AUTHOR
Mark Adler (Info-ZIP)
Info-ZIP 28 February 2005 (v3.94) 2
