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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.


NAME
       zcat — expand and concatenate data


SYNOPSIS
       zcat [file...]


DESCRIPTION
       The  zcat  utility shall write to standard output the uncompressed form of files that have
       been compressed using the compress utility. It is the equivalent of uncompress −c.   Input
       files are not affected.


OPTIONS
       None.


OPERANDS
       The following operand shall be supported:

       file      The  pathname  of  a  file previously processed by the compress utility. If file
                 already has the .Z suffix specified, it is used as submitted. Otherwise, the  .Z
                 suffix is appended to the filename prior to processing.


STDIN
       The  standard  input  shall  be  used only if no file operands are specified, or if a file
       operand is '−'.


INPUT FILES
       Input files shall be compressed files that are in the  format  produced  by  the  compress
       utility.


ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of zcat:

       LANG      Provide a default value for the internationalization variables that are unset or
                 null.  (See  the  Base  Definitions  volume  of   POSIX.1‐2008,   Section   8.2,
                 Internationalization   Variables  for  the  precedence  of  internationalization
                 variables used to determine the values of locale categories.)

       LC_ALL    If set to a non-empty string  value,  override  the  values  of  all  the  other
                 internationalization variables.

       LC_CTYPE  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).

       LC_MESSAGES
                 Determine  the  locale  that should be used to affect the format and contents of
                 diagnostic messages written to standard error.

       NLSPATH   Determine the location of message catalogs for the processing of LC_MESSAGES.


ASYNCHRONOUS EVENTS
       Default.


STDOUT
       The compressed files given  as  input  shall  be  written  on  standard  output  in  their
       uncompressed form.


STDERR
       The standard error shall be used only for diagnostic messages.


OUTPUT FILES
       None.


EXTENDED DESCRIPTION
       None.


EXIT STATUS
       The following exit values shall be returned:

        0    Successful completion.

       >0    An error occurred.


CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.


APPLICATION USAGE
       None.


EXAMPLES
       None.


RATIONALE
       None.


FUTURE DIRECTIONS
       None.


SEE ALSO
       compress, uncompress

       The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment Variables


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 .

       Any typographical or formatting errors that appear in this page are most  likely  to  have
       been  introduced  during  the conversion of the source files to man page format. To report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .