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+'\" et
+.TH TEE "1P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.SH 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.
+
+.SH NAME
+tee
+\(em duplicate standard input
+.SH SYNOPSIS
+.LP
+.nf
+tee \fB[\fR\(miai\fB] [\fIfile\fR...\fB]\fR
+.fi
+.SH DESCRIPTION
+The
+.IR tee
+utility shall copy standard input to standard output, making a copy in
+zero or more files. The
+.IR tee
+utility shall not buffer output.
+.P
+If the
+.BR \(mia
+option is not specified, output files shall be written (see
+.IR "Section 1.1.1.4" ", " "File Read" ", " "Write" ", " "and Creation".
+.SH OPTIONS
+The
+.IR tee
+utility shall conform to the Base Definitions volume of POSIX.1\(hy2008,
+.IR "Section 12.2" ", " "Utility Syntax Guidelines".
+.P
+The following options shall be supported:
+.IP "\fB\(mia\fP" 10
+Append the output to the files.
+.IP "\fB\(mii\fP" 10
+Ignore the SIGINT signal.
+.SH OPERANDS
+The following operands shall be supported:
+.IP "\fIfile\fR" 10
+A pathname of an output file. If a
+.IR file
+operand is
+.BR '\(mi' ,
+it shall refer to a file named
+.BR \(mi ;
+implementations shall not treat it as meaning standard output.
+Processing of at least 13
+.IR file
+operands shall be supported.
+.SH STDIN
+The standard input can be of any type.
+.SH "INPUT FILES"
+None.
+.SH "ENVIRONMENT VARIABLES"
+The following environment variables shall affect the execution of
+.IR tee :
+.IP "\fILANG\fP" 10
+Provide a default value for the internationalization variables that are
+unset or null. (See the Base Definitions volume of POSIX.1\(hy2008,
+.IR "Section 8.2" ", " "Internationalization Variables"
+for the precedence of internationalization variables used to determine
+the values of locale categories.)
+.IP "\fILC_ALL\fP" 10
+If set to a non-empty string value, override the values of all the
+other internationalization variables.
+.IP "\fILC_CTYPE\fP" 10
+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).
+.IP "\fILC_MESSAGES\fP" 10
+.br
+Determine the locale that should be used to affect the format and
+contents of diagnostic messages written to standard error.
+.IP "\fINLSPATH\fP" 10
+Determine the location of message catalogs for the processing of
+.IR LC_MESSAGES .
+.SH "ASYNCHRONOUS EVENTS"
+Default, except that if the
+.BR \(mii
+option was specified, SIGINT shall be ignored.
+.SH STDOUT
+The standard output shall be a copy of the standard input.
+.SH STDERR
+The standard error shall be used only for diagnostic messages.
+.SH "OUTPUT FILES"
+If any
+.IR file
+operands are specified, the standard input shall be copied to each
+named file.
+.SH "EXTENDED DESCRIPTION"
+None.
+.SH "EXIT STATUS"
+The following exit values shall be returned:
+.IP "\00" 6
+The standard input was successfully copied to all output files.
+.IP >0 6
+An error occurred.
+.SH "CONSEQUENCES OF ERRORS"
+If a write to any successfully opened
+.IR file
+operand fails, writes to other successfully opened
+.IR file
+operands and standard output shall continue, but the exit status shall
+be non-zero. Otherwise, the default actions specified in
+.IR "Section 1.4" ", " "Utility Description Defaults"
+apply.
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+The
+.IR tee
+utility is usually used in a pipeline, to make a copy of the output of
+some utility.
+.P
+The
+.IR file
+operand is technically optional, but
+.IR tee
+is no more useful than
+.IR cat
+when none is specified.
+.SH EXAMPLES
+Save an unsorted intermediate form of the data in a pipeline:
+.sp
+.RS 4
+.nf
+\fB
+\&... | tee unsorted | sort > sorted
+.fi \fR
+.P
+.RE
+.SH RATIONALE
+The buffering requirement means that
+.IR tee
+is not allowed to use ISO\ C standard fully buffered or line-buffered writes. It
+does not mean that
+.IR tee
+has to do 1-byte reads followed by 1-byte writes.
+.P
+It should be noted that early versions of BSD ignore any invalid
+options and accept a single
+.BR '\(mi' 
+as an alternative to
+.BR \(mii .
+They also print a message if unable to open a file:
+.sp
+.RS 4
+.nf
+\fB
+"tee: cannot access %s\en", <\fIpathname\fP>
+.fi \fR
+.P
+.RE
+.P
+Historical implementations ignore write errors. This is explicitly not
+permitted by this volume of POSIX.1\(hy2008.
+.P
+Some historical implementations use O_APPEND when providing append
+mode; others use the
+\fIlseek\fR()
+function to seek to the end-of-file after opening the file without
+O_APPEND. This volume of POSIX.1\(hy2008 requires functionality equivalent to using O_APPEND;
+see
+.IR "Section 1.1.1.4" ", " "File Read" ", " "Write" ", " "and Creation".
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "Chapter 1" ", " "Introduction",
+.IR "\fIcat\fR\^"
+.P
+The Base Definitions volume of POSIX.1\(hy2008,
+.IR "Chapter 8" ", " "Environment Variables",
+.IR "Section 12.2" ", " "Utility Syntax Guidelines"
+.P
+The System Interfaces volume of POSIX.1\(hy2008,
+.IR "\fIlseek\fR\^(\|)"
+.SH COPYRIGHT
+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 .