128 lines
4.8 KiB
Groff
128 lines
4.8 KiB
Groff
.\" Copyright (c) 1990-2009 Info-ZIP. All rights reserved.
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.\"
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.\" See the accompanying file LICENSE, version 2009-Jan-02 or later
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.\" (the contents of which are also included in unzip.h) for terms of use.
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.\" If, for some reason, all these files are missing, the Info-ZIP license
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.\" also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
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.\"
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.\" funzip.1 by Greg Roelofs and others.
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.\"
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.\" =========================================================================
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.\" define .EX/.EE (for multiline user-command examples; normal Courier font)
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.de EX
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.in +4n
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.nf
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.ft CW
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..
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.de EE
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.ft R
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.fi
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.in -4n
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..
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.\" =========================================================================
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.TH FUNZIP 1L "20 April 2009 (v3.95)" "Info-ZIP"
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.SH NAME
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funzip \- filter for extracting from a ZIP archive in a pipe
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.PD
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.SH SYNOPSIS
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\fBfunzip\fP [\fB\-password\fP] [\fIinput[.zip|.gz]\fP]
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.\" =========================================================================
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.SH ARGUMENTS
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.IP [\fI\-password\fP]
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Optional password to be used if ZIP archive is encrypted. Decryption
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may not be supported at some sites. See DESCRIPTION for more details.
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.IP [\fIinput[.zip|.gz]\fP]
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Optional input archive file specification. See DESCRIPTION for details.
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.PD
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.\" =========================================================================
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.SH DESCRIPTION
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.I funzip
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without a file argument acts as a filter; that is, it assumes that a
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ZIP archive (or a \fIgzip\fP'd(1) file) is being piped into
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standard input, and it extracts the first member from the archive to stdout.
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When stdin comes from a tty device,
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.I funzip
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assumes that this cannot be a stream of (binary) compressed data and
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shows a short help text, instead.
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If there is a file argument, then input is read from the specified file
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instead of from stdin.
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.PP
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A password for encrypted zip files can be specified
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on the command line (preceding the file name, if any) by prefixing the
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password with a dash. Note that this constitutes a security risk on many
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systems; currently running processes are often visible via simple commands
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(e.g., \fIps\fP(1) under Unix), and command-line histories can be read.
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If the first entry of the zip file is encrypted and
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no password is specified on the command line, then the user is prompted for
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a password and the password is not echoed on the console.
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.PP
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Given the limitation on single-member extraction, \fIfunzip\fP is most
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useful in conjunction with a secondary archiver program such as \fItar\fP(1).
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The following section includes an example illustrating this usage in the
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case of disk backups to tape.
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.PD
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.\" =========================================================================
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.SH EXAMPLES
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To use \fIfunzip\fP to extract the first member file of the archive test.zip
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and to pipe it into \fImore\fP(1):
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.PP
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.EX
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funzip test.zip | more
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.EE
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.PP
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To use \fIfunzip\fP 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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.PP
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.EX
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funzip test.zip > /dev/null
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.EE
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.PP
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To use \fIzip\fP and \fIfunzip\fP in place of \fIcompress\fP(1) and
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\fIzcat\fP(1) (or \fIgzip\fP(1L) and \fIgzcat\fP(1L)) for tape backups:
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.PP
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.EX
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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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.EE
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.PP
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(where, for example, nrst0 is a SCSI tape drive).
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.PD
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.\" =========================================================================
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.SH BUGS
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When piping an encrypted file into \fImore\fP and allowing \fIfunzip\fP
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to prompt for password, the terminal may sometimes be reset to a non-echo
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mode. This is apparently due to a race condition between the two programs;
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\fIfunzip\fP changes the terminal mode to non-echo before \fImore\fP reads
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its state, and \fImore\fP then ``restores'' the terminal to this mode before
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exiting. To recover, run \fIfunzip\fP 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, \fIfunzip\fP will reset the terminal properly.
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.PP
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There is presently no way to extract any member but the first from a ZIP
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archive. This would be useful in the case where a ZIP archive is included
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within another archive. In the case where the first member is a directory,
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\fIfunzip\fP simply creates the directory and exits.
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.PP
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The functionality of \fIfunzip\fP should be incorporated into \fIunzip\fP
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itself (future release).
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.PD
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.\" =========================================================================
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.SH "SEE ALSO"
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\fIgzip\fP(1L), \fIunzip\fP(1L), \fIunzipsfx\fP(1L), \fIzip\fP(1L),
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\fIzipcloak\fP(1L), \fIzipinfo\fP(1L), \fIzipnote\fP(1L), \fIzipsplit\fP(1L)
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.PD
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.\" =========================================================================
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.SH URL
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The Info-ZIP home page is currently at
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.EX
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\fChttp://www.info-zip.org/pub/infozip/\fR
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.EE
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or
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.EX
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\fCftp://ftp.info-zip.org/pub/infozip/\fR .
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.EE
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.PD
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.\" =========================================================================
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.SH AUTHOR
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Mark Adler (Info-ZIP)
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