funzip.doc
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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 28 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 28 November 1998 (v3.93) 2