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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "UNSETENV" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" unsetenv 
+.SH NAME
+unsetenv \- remove an environment variable
+.SH SYNOPSIS
+.LP
+\fB#include <stdlib.h>
+.br
+.sp
+int unsetenv(const char *\fP\fIname\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIunsetenv\fP() function shall remove an environment variable
+from the environment of the calling process. The \fIname\fP
+argument points to a string, which is the name of the variable to
+be removed. The named argument shall not contain an \fB'='\fP
+character. If the named variable does not exist in the current environment,
+the environment shall be unchanged and the function is
+considered to have completed successfully.
+.LP
+If the application modifies \fIenviron\fP or the pointers to which
+it points, the behavior of \fIunsetenv\fP() is undefined.
+The \fIunsetenv\fP() function shall update the list of pointers to
+which \fIenviron\fP points.
+.LP
+The \fIunsetenv\fP() function need not be reentrant. A function that
+is not required to be reentrant is not required to be
+thread-safe.
+.SH RETURN VALUE
+.LP
+Upon successful completion, zero shall be returned. Otherwise, -1
+shall be returned, \fIerrno\fP set to indicate the error, and
+the environment shall be unchanged.
+.SH ERRORS
+.LP
+The \fIunsetenv\fP() function shall fail if:
+.TP 7
+.B EINVAL
+The \fIname\fP argument is a null pointer, points to an empty string,
+or points to a string containing an \fB'='\fP
+character.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+Refer to the RATIONALE section in \fIsetenv\fP() .
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIgetenv\fP() , \fIsetenv\fP() , the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<stdlib.h>\fP, \fI<sys/types.h>\fP, \fI<unistd.h>\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 .