?? funzip.txt
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FUNZIP(1L) FUNZIP(1L)NAME funzip - filter for extracting from a ZIP archive in a pipeSYNOPSIS 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 prefix- ing the password with a dash. Note that this constitutes a security risk on many systems; currently running pro- cesses 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 pass- word 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/nullInfo-ZIP 17 February 2002 (v3.94) 1FUNZIP(1L) 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 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.info-zip.org/pub/infozip/ or ftp://ftp.info-zip.org/pub/infozip/ .AUTHOR Mark Adler (Info-ZIP)Info-ZIP 17 February 2002 (v3.94) 2
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