funzip - Online in the Cloud

PROGRAM:

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
supported 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 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

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).

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