PROLOG | NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | STDIN | INPUT FILES | ENVIRONMENT VARIABLES | ASYNCHRONOUS EVENTS | STDOUT | STDERR | OUTPUT FILES | EXTENDED DESCRIPTION | EXIT STATUS | CONSEQUENCES OF ERRORS | APPLICATION USAGE | EXAMPLES | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

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

PROLOG         top

       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         top

       uncompress — expand compressed data

SYNOPSIS         top

       uncompress [−cfv] [file...]

DESCRIPTION         top

       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 implementation. For files produced
       by compress on other systems, uncompress supports 9 to 14-bit
       compression (see compress(1p), −b); it is implementation-defined
       whether values of −b greater than 14 are supported.

OPTIONS         top

       The uncompress utility shall conform to the Base Definitions volume
       of POSIX.1‐2008, Section 12.2, Utility Syntax Guidelines, except that
       Guideline 1 does apply since the utility name has ten letters.

       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         top

       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         top

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

INPUT FILES         top

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

ENVIRONMENT VARIABLES         top

       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 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         top

       Default.

STDOUT         top

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

STDERR         top

       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. Otherwise, the standard error output shall be
       used only for diagnostic messages.

OUTPUT FILES         top

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

EXTENDED DESCRIPTION         top

       None.

EXIT STATUS         top

       The following exit values shall be returned:

        0    Successful completion.

       >0    An error occurred.

CONSEQUENCES OF ERRORS         top

       The input file remains unmodified.

       The following sections are informative.

APPLICATION USAGE         top

       The limit of 14 on the compress −b bits argument is to achieve
       portability 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         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       compress(1p), zcat(1p)

       The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
       Variables, Section 12.2, Utility Syntax Guidelines

COPYRIGHT         top

       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 .

IEEE/The Open Group                 2013                      UNCOMPRESS(1P)