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 .

IEEE/The Open Group                                   2003                                               ZCAT(P)