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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  IEEE Std 1003.1-2001,  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


COPYRIGHT
       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable  Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  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.opengroup.org/unix/online.html .