93 lines
3.9 KiB
Plaintext
93 lines
3.9 KiB
Plaintext
FUNZIP(1L) FUNZIP(1L)
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NAME
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funzip - filter for extracting from a ZIP archive in a pipe
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SYNOPSIS
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funzip [-password] [input[.zip|.gz]]
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ARGUMENTS
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[-password]
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Optional password to be used if ZIP archive is encrypted.
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Decryption may not be supported at some sites. See DESCRIPTION
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for more details.
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[input[.zip|.gz]]
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Optional input archive file specification. See DESCRIPTION for
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details.
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DESCRIPTION
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funzip without a file argument acts as a filter; that is, it assumes
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that a ZIP archive (or a gzip'd(1) file) is being piped into standard
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input, and it extracts the first member from the archive to stdout.
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When stdin comes from a tty device, funzip assumes that this cannot be
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a stream of (binary) compressed data and shows a short help text,
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instead. If there is a file argument, then input is read from the
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specified file instead of from stdin.
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A password for encrypted zip files can be specified on the command line
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(preceding the file name, if any) by prefixing the password with a
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dash. Note that this constitutes a security risk on many systems; cur-
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rently running processes are often visible via simple commands (e.g.,
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ps(1) under Unix), and command-line histories can be read. If the
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first entry of the zip file is encrypted and no password is specified
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on the command line, then the user is prompted for a password and the
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password is not echoed on the console.
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Given the limitation on single-member extraction, funzip is most useful
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in conjunction with a secondary archiver program such as tar(1). The
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following section includes an example illustrating this usage in the
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case of disk backups to tape.
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EXAMPLES
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To use funzip to extract the first member file of the archive test.zip
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and to pipe it into more(1):
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funzip test.zip | more
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To use funzip to test the first member file of test.zip (any errors
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will be reported on standard error):
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funzip test.zip > /dev/null
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To use zip and funzip in place of compress(1) and zcat(1) (or gzip(1L)
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and gzcat(1L)) for tape backups:
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tar cf - . | zip -7 | dd of=/dev/nrst0 obs=8k
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dd if=/dev/nrst0 ibs=8k | funzip | tar xf -
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(where, for example, nrst0 is a SCSI tape drive).
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BUGS
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When piping an encrypted file into more and allowing funzip to prompt
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for password, the terminal may sometimes be reset to a non-echo mode.
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This is apparently due to a race condition between the two programs;
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funzip changes the terminal mode to non-echo before more reads its
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state, and more then ``restores'' the terminal to this mode before
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exiting. To recover, run funzip on the same file but redirect to
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/dev/null rather than piping into more; after prompting again for the
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password, funzip will reset the terminal properly.
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There is presently no way to extract any member but the first from a
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ZIP archive. This would be useful in the case where a ZIP archive is
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included within another archive. In the case where the first member is
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a directory, funzip simply creates the directory and exits.
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The functionality of funzip should be incorporated into unzip itself
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(future release).
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SEE ALSO
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gzip(1L), unzip(1L), unzipsfx(1L), zip(1L), zipcloak(1L), zipinfo(1L),
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zipnote(1L), zipsplit(1L)
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URL
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The Info-ZIP home page is currently at
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http://www.info-zip.org/pub/infozip/
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or
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ftp://ftp.info-zip.org/pub/infozip/ .
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AUTHOR
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Mark Adler (Info-ZIP)
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Info-ZIP 20 April 2009 (v3.95) FUNZIP(1L)
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