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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
+.TH "UUDECODE" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" uudecode
+.SH NAME
+uudecode \- decode a binary file
+.SH SYNOPSIS
+.LP
+\fBuudecode\fP \fB[\fP\fB-o\fP \fIoutfile\fP\fB][\fP\fIfile\fP\fB]\fP\fB\fP
+.SH DESCRIPTION
+.LP
+The \fIuudecode\fP utility shall read a file, or standard input if
+no file is specified, that includes data created by the \fIuuencode\fP
+utility. The \fIuudecode\fP utility shall scan the input file, searching
+for
+data compatible with one of the formats specified in \fIuuencode\fP,
+and attempt to
+create or overwrite the file described by the data (or overridden
+by the \fB-o\fP option). The pathname shall be contained in the
+data or specified by the \fB-o\fP 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 \fIumask\fP() ), shall
+not affect the file being produced.
+.LP
+If the pathname of the file to be produced exists, and the user does
+not have write permission on that file, \fIuudecode\fP
+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.
+.LP
+If the input data was produced by \fIuuencode\fP on a system with
+a different number
+of bits per byte than on the target system, the results of \fIuudecode\fP
+are unspecified.
+.SH OPTIONS
+.LP
+The \fIuudecode\fP utility shall conform to the Base Definitions volume
+of IEEE\ Std\ 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
+.LP
+The following option shall be supported by the implementation:
+.TP 7
+\fB-o\ \fP \fIoutfile\fP
+A pathname of a file that shall be used instead of any pathname contained
+in the input data. Specifying an \fIoutfile\fP
+option-argument of \fB/dev/stdout\fP shall indicate standard output.
+.sp
+.SH OPERANDS
+.LP
+The following operand shall be supported:
+.TP 7
+\fIfile\fP
+The pathname of a file containing the output of \fIuuencode\fP.
+.sp
+.SH STDIN
+.LP
+See the INPUT FILES section.
+.SH INPUT FILES
+.LP
+The input files shall be files containing the output of \fIuuencode\fP.
+.SH ENVIRONMENT VARIABLES
+.LP
+The following environment variables shall affect the execution of
+\fIuudecode\fP:
+.TP 7
+\fILANG\fP
+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 Variables
+for
+the precedence of internationalization variables used to determine
+the values of locale categories.)
+.TP 7
+\fILC_ALL\fP
+If set to a non-empty string value, override the values of all the
+other internationalization variables.
+.TP 7
+\fILC_CTYPE\fP
+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).
+.TP 7
+\fILC_MESSAGES\fP
+Determine the locale that should be used to affect the format and
+contents of diagnostic messages written to standard
+error.
+.TP 7
+\fINLSPATH\fP
+Determine the location of message catalogs for the processing of \fILC_MESSAGES
+\&.\fP
+.sp
+.SH ASYNCHRONOUS EVENTS
+.LP
+Default.
+.SH STDOUT
+.LP
+If the file data header encoded by \fIuuencode\fP is \fB-\fP or \fB/dev/stdout\fP,
+or the \fB-o\fP \fB/dev/stdout\fP option overrides the file data,
+the standard output shall be in the same format as the file
+originally encoded by \fIuuencode\fP. Otherwise, the standard output
+shall not be
+used.
+.SH STDERR
+.LP
+The standard error shall be used only for diagnostic messages.
+.SH OUTPUT FILES
+.LP
+The output file shall be in the same format as the file originally
+encoded by \fIuuencode\fP.
+.SH EXTENDED DESCRIPTION
+.LP
+None.
+.SH EXIT STATUS
+.LP
+The following exit values shall be returned:
+.TP 7
+\ 0
+Successful completion.
+.TP 7
+>0
+An error occurred.
+.sp
+.SH CONSEQUENCES OF ERRORS
+.LP
+Default.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+The user who is invoking \fIuudecode\fP must have write permission
+on any file being created.
+.LP
+The output of \fIuuencode\fP 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 architectures is generally character data.
+.SH EXAMPLES
+.LP
+None.
+.SH RATIONALE
+.LP
+Input files are not necessarily text files, as stated by an early
+proposal. Although the \fIuuencode\fP output is a text file, that
+output could have been wrapped within another file or
+mail message that is not a text file.
+.LP
+The \fB-o\fP 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.
+.LP
+In early drafts, the [ \fB-o\fP \fIoutfile\fP] option-argument allowed
+the use of \fB-\fP to mean standard output. The symbol
+\fB-\fP 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 \fB-\fP in this manner.
+The \fB/dev/stdout\fP concept exists on most modern
+systems. The \fB/dev/stdout\fP syntax does not refer to a new special
+file. It is just a magic cookie to specify standard
+output.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIumask\fP() , \fIuuencode\fP
+.SH 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 original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .