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

       uudecode - decode a binary file

       uudecode [-o outfile][file]

       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 compati-
       ble with one of the formats specified in uuencode, and attempt to  cre-
       ate  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 permission 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

       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 uude-
       code are unspecified.

       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-argu-
              ment of /dev/stdout shall indicate standard output.

       The following operand shall be supported:

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

       See the INPUT FILES section.

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

       The following environment variables shall affect the execution of uude-

       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,  Internationalization  Vari-
              ables  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.

              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 and input files).

              Determine  the  locale  that should be used to affect the format
              and contents of diagnostic messages written to standard error.

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


       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.

       The standard error shall be used only for diagnostic messages.

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


       The following exit values shall be returned:

        0     Successful completion.

       >0     An error occurred.


       The following sections are informative.

       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 satisfying.  Of course,
       the only data that is meaningful for such a transfer between  architec-
       tures is generally character data.


       Input  files are not necessarily text files, as stated by an early pro-
       posal. 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.


       umask() , uuencode

       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 original Standard can be obtained online
       at .

IEEE/The Open Group                  2003                          UUDECODE(P)

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