107 lines
4.1 KiB
Plaintext
107 lines
4.1 KiB
Plaintext
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FUNZIP(1L) FUNZIP(1L)
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NAME
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funzip - filter for extracting from a ZIP archive in a
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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
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encrypted. Decryption may not be supported at some
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sites. See DESCRIPTION for more details.
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[input[.zip|.gz]]
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Optional input archive file specification. See
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DESCRIPTION for details.
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DESCRIPTION
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funzip without a file argument acts as a filter; that is,
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it assumes that a ZIP archive (or a gzip'd(1) file) is
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being piped into standard input, and it extracts the first
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member from the archive to stdout. When stdin comes from
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a tty device, funzip assumes that this cannot be a stream
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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
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from the specified file instead of from stdin.
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A password for encrypted zip files can be specified on the
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command line (preceding the file name, if any) by prefix-
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ing the password with a dash. Note that this constitutes
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a security risk on many systems; currently running pro-
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cesses are often visible via simple commands (e.g., ps(1)
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under Unix), and command-line histories can be read. If
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the first entry of the zip file is encrypted and no pass-
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word is specified on the command line, then the user is
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prompted for a password and the password is not echoed on
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the console.
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Given the limitation on single-member extraction, funzip
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is most useful in conjunction with a secondary archiver
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program such as tar(1). The following section includes an
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example illustrating this usage in the case of disk back-
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ups to tape.
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EXAMPLES
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To use funzip to extract the first member file of the
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archive test.zip 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
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(any errors will be reported on standard error):
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funzip test.zip > /dev/null
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Info-ZIP 17 February 2002 (v3.94) 1
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FUNZIP(1L) FUNZIP(1L)
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To use zip and funzip in place of compress(1) and zcat(1)
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(or gzip(1L) 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 fun-
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zip to prompt for password, the terminal may sometimes be
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reset to a non-echo mode. This is apparently due to a
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race condition between the two programs; funzip changes
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the terminal mode to non-echo before more reads its state,
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and more then ``restores'' the terminal to this mode
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before exiting. To recover, run funzip on the same file
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but redirect to /dev/null rather than piping into more;
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after prompting again for the password, funzip will reset
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the terminal properly.
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There is presently no way to extract any member but the
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first from a ZIP archive. This would be useful in the
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case where a ZIP archive is included within another
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archive. In the case where the first member is a direc-
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tory, funzip simply creates the directory and exits.
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The functionality of funzip should be incorporated into
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unzip itself (future release).
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SEE ALSO
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gzip(1L), unzip(1L), unzipsfx(1L), zip(1L), zipcloak(1L),
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zipinfo(1L), 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 17 February 2002 (v3.94) 2
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