uncompress(1p) — Linux manual page

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.1‐2017, 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.1‐2017, 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.1‐2017, 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 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 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 .

       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               2017                    UNCOMPRESS(1P)

Pages that refer to this page: compress(1p)zcat(1p)