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UNCOMPRESS(P)              POSIX Programmer's Manual             UNCOMPRESS(P)

NAME
       uncompress - expand compressed data

SYNOPSIS
       uncompress [-cfv][file...]

DESCRIPTION
       The  uncompress  utility  shall  restore  files to their original state
       after they have been compressed using  the  compress  utility.   If  no
       files  are  specified,  the standard input shall be uncompressed to the
       standard output. If the invoking process  has  appropriate  privileges,
       the  ownership, modes, access time, and modification time of the origi-
       nal file shall be preserved.

       This utility shall support the uncompressing of any files  produced  by
       the  compress utility on the same implementation. For files produced by
       compress on other systems, uncompress supports 9 to 14-bit  compression
       (see  compress , -b); it is implementation-defined whether values of -b
       greater than 14 are supported.

OPTIONS
       The uncompress utility shall conform to the Base Definitions volume  of
       IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.

       The following options shall be supported:

       -c     Write to standard output; no files are changed.

       -f     Do  not  prompt  for  overwriting  files. Except when run in the
              background, if -f is not given the user shall be prompted as  to
              whether  an existing file should be overwritten. If the standard
              input is not a terminal and -f is not  given,  uncompress  shall
              write  a  diagnostic  message  to standard error and exit with a
              status greater than zero.

       -v     Write messages to standard error  concerning  the  expansion  of
              each file.

OPERANDS
       The following operand shall be supported:

       file   A  pathname  of a file. If file already has the .Z suffix speci-
              fied, it shall be used as the input file  and  the  output  file
              shall be named file with the .Z suffix removed.  Otherwise, file
              shall be used as the name of the output file and file  with  the
              .Z suffix appended shall be used as the input file.

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

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

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

       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 Vari-
              ables 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
       When there are no file operands or the  -c  option  is  specified,  the
       uncompressed output is written to standard output.

STDERR
       Prompts  shall be written to the standard error output under the condi-
       tions specified in the DESCRIPTION and OPTIONS sections.   The  prompts
       shall contain the file pathname, but their format is otherwise unspeci-
       fied. Otherwise, the standard error output shall be used only for diag-
       nostic messages.

OUTPUT FILES
       Output files are the same as the respective input files to compress.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

        0     Successful completion.

       >0     An error occurred.

CONSEQUENCES OF ERRORS
       The input file remains unmodified.

       The following sections are informative.

APPLICATION USAGE
       The  limit  of 14 on the compress -b bits argument is to achieve porta-
       bility to all systems (within the restrictions imposed by the  lack  of
       an  explicit  published  file  format).  Some  implementations based on
       16-bit architectures cannot support 15 or 16-bit uncompression.

EXAMPLES
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       compress , zcat

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                        UNCOMPRESS(P)

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