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UNCOMPRESS(1P)             POSIX Programmer's Manual            UNCOMPRESS(1P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

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 original file shall be preserved.

       This utility shall support the uncompressing of any files produced by the compress utility on the  same  imple-
       mentation.  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 specified, 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 specified, 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 Variables for the prece-
              dence 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 exam-
              ple, 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  writ-
              ten 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 conditions specified  in  the  DESCRIPTION  and
       OPTIONS sections.  The prompts shall contain the file pathname, but their format is otherwise unspecified. Oth-
       erwise, the standard error output shall be used only for diagnostic 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 portability to all systems (within the  restric-
       tions imposed by the lack of an explicit published file format). Some implementations based on 16-bit architec-
       tures 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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions 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 Stan-
       dard, 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(1P)