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.TH ZCAT "1P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
.SH PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.

.SH NAME
zcat
\(em expand and concatenate data
.SH SYNOPSIS
.LP
.nf
zcat \fB[\fIfile\fR...\fB]\fR
.fi
.SH DESCRIPTION
The
.IR zcat
utility shall write to standard output the uncompressed form of files
that have been compressed using the
.IR compress
utility. It is the equivalent of
.IR uncompress
.BR \(mic .
Input files are not affected.
.SH OPTIONS
None.
.SH OPERANDS
The following operand shall be supported:
.IP "\fIfile\fR" 10
The pathname of a file previously processed by the
.IR compress
utility. If
.IR file
already has the
.BR .Z
suffix specified, it is used as submitted. Otherwise, the
.BR .Z
suffix is appended to the filename prior to processing.
.SH STDIN
The standard input shall be used only if no
.IR file
operands are specified, or if a
.IR file
operand is
.BR '\(mi' .
.SH "INPUT FILES"
Input files shall be compressed files that are in the format produced by
the
.IR compress
utility.
.SH "ENVIRONMENT VARIABLES"
The following environment variables shall affect the execution of
.IR zcat :
.IP "\fILANG\fP" 10
Provide a default value for the internationalization variables that are
unset or null. (See the Base Definitions volume of POSIX.1\(hy2008,
.IR "Section 8.2" ", " "Internationalization Variables"
for the precedence of internationalization variables used to determine
the values of locale categories.)
.IP "\fILC_ALL\fP" 10
If set to a non-empty string value, override the values of all the
other internationalization variables.
.IP "\fILC_CTYPE\fP" 10
Determine the locale for the interpretation of sequences of bytes of
text data as characters (for example, single-byte as opposed to
multi-byte characters in arguments).
.IP "\fILC_MESSAGES\fP" 10
.br
Determine the locale that should be used to affect the format and
contents of diagnostic messages written to standard error.
.IP "\fINLSPATH\fP" 10
Determine the location of message catalogs for the processing of
.IR LC_MESSAGES .
.SH "ASYNCHRONOUS EVENTS"
Default.
.SH STDOUT
The compressed files given as input shall be written on standard output
in their uncompressed form.
.SH STDERR
The standard error shall be used only for diagnostic messages.
.SH "OUTPUT FILES"
None.
.SH "EXTENDED DESCRIPTION"
None.
.SH "EXIT STATUS"
The following exit values shall be returned:
.IP "\00" 6
Successful completion.
.IP >0 6
An error occurred.
.SH "CONSEQUENCES OF ERRORS"
Default.
.LP
.IR "The following sections are informative."
.SH "APPLICATION USAGE"
None.
.SH EXAMPLES
None.
.SH RATIONALE
None.
.SH "FUTURE DIRECTIONS"
None.
.SH "SEE ALSO"
.IR "\fIcompress\fR\^",
.IR "\fIuncompress\fR\^"
.P
The Base Definitions volume of POSIX.1\(hy2008,
.IR "Chapter 8" ", " "Environment Variables"
.SH COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.unix.org/online.html .

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