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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)
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.
uncompress — expand compressed data
uncompress [−cfv] [file...]
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.
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.
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.
The standard input shall be used only if no file operands are
specified, or if a file operand is '−'.
Input files shall be in the format produced by the compress utility.
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.
Default.
When there are no file operands or the −c option is specified, the
uncompressed output is written to standard output.
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 are the same as the respective input files to compress.
None.
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
The input file remains unmodified.
The following sections are informative.
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.
None.
None.
None.
compress(1p), zcat(1p)
The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
Variables, Section 12.2, Utility Syntax Guidelines
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)
Pages that refer to this page: compress(1p), zcat(1p)