This is the command uncompressposix that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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 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 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
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 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
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. Otherwise, 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 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.
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