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



PROLOG
       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
       uudecode - decode a binary file

SYNOPSIS
       uudecode [-o outfile][file]

DESCRIPTION
       The  uudecode  utility  shall read a file, or standard input if no file is specified, that
       includes data created by the uuencode utility. The uudecode utility shall scan  the  input
       file,  searching  for  data  compatible with one of the formats specified in uuencode, and
       attempt to create or overwrite the file described by the data (or  overridden  by  the  -o
       option).  The  pathname  shall be contained in the data or specified by the -o option. The
       file access permission bits and contents for the file to be produced shall be contained in
       that  data.  The  mode  bits of the created file (other than standard output) shall be set
       from the file access permission bits contained in the data; that is, other  attributes  of
       the  mode,  including the file mode creation mask (see umask()), shall not affect the file
       being produced.

       If the pathname of the file to be produced exists, and the user does not have  write  per-
       mission  on that file, uudecode shall terminate with an error. If the pathname of the file
       to be produced exists, and the user has write permission on that file, the  existing  file
       shall be overwritten.

       If the input data was produced by uuencode on a system with a different number of bits per
       byte than on the target system, the results of uudecode are unspecified.

OPTIONS
       The uudecode utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001,
       Section 12.2, Utility Syntax Guidelines.

       The following option shall be supported by the implementation:

       -o  outfile
              A  pathname  of  a file that shall be used instead of any pathname contained in the
              input data. Specifying an outfile option-argument  of  /dev/stdout  shall  indicate
              standard output.


OPERANDS
       The following operand shall be supported:

       file   The pathname of a file containing the output of uuencode.


STDIN
       See the INPUT FILES section.

INPUT FILES
       The input files shall be files containing the output of uuencode.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of uudecode:

       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, Inter-
              nationalization 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  interna-
              tionalization 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  argu-
              ments and input files).

       LC_MESSAGES
              Determine the locale that should be used to affect the format and contents of diag-
              nostic messages written to standard error.

       NLSPATH
              Determine the location of message catalogs for the processing of LC_MESSAGES .


ASYNCHRONOUS EVENTS
       Default.

STDOUT
       If the file data header encoded by uuencode is - or /dev/stdout,  or  the  -o  /dev/stdout
       option  overrides  the  file  data, the standard output shall be in the same format as the
       file originally encoded by uuencode. Otherwise, the standard output shall not be used.

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       The output file shall be in the same format as the file originally encoded by uuencode.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

        0     Successful completion.

       >0     An error occurred.


CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       The user who is invoking uudecode must have write permission on any file being created.

       The output of uuencode is essentially an encoded bit stream that is not cognizant of  byte
       boundaries.  It  is  possible  that  a 9-bit byte target machine can process input from an
       8-bit source, if it is aware of the requirement, but the reverse is unlikely to be  satis-
       fying.   Of course, the only data that is meaningful for such a transfer between architec-
       tures is generally character data.

EXAMPLES
       None.

RATIONALE
       Input files are not necessarily text files, as stated by an early proposal.  Although  the
       uuencode output is a text file, that output could have been wrapped within another file or
       mail message that is not a text file.

       The -o option is not historical practice, but was added at the request of WG15 so that the
       user could override the target pathname without having to edit the input data itself.

       In  early  drafts, the [ -o outfile] option-argument allowed the use of - to mean standard
       output. The symbol - has only been used previously in IEEE Std 1003.1-2001 as  a  standard
       input  indicator. The developers of the standard did not wish to overload the meaning of -
       in this manner.  The /dev/stdout concept exists on most modern  systems.  The  /dev/stdout
       syntax does not refer to a new special file. It is just a magic cookie to specify standard
       output.

FUTURE DIRECTIONS
       None.

SEE ALSO
       umask(), uuencode

COPYRIGHT
       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2003  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications 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
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                            2003                                  UUDECODE(1P)

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