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+'\" et
+.TH UNSETENV "3P" 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
+unsetenv
+\(em remove an environment variable
+.SH SYNOPSIS
+.LP
+.nf
+#include <stdlib.h>
+.P
+int unsetenv(const char *\fIname\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIunsetenv\fR()
+function shall remove an environment variable from the environment
+of the calling process. The
+.IR name
+argument points to a string, which is the name of the variable to be
+removed. The named argument shall not contain an
+.BR '=' 
+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.
+.P
+The
+\fIunsetenv\fR()
+function shall update the list of pointers to which
+.IR environ
+points.
+.P
+The
+\fIunsetenv\fR()
+function need not be thread-safe.
+.SH "RETURN VALUE"
+Upon successful completion, zero shall be returned. Otherwise, \(mi1
+shall be returned,
+.IR errno
+set to indicate the error, and the environment shall be unchanged.
+.SH ERRORS
+The
+\fIunsetenv\fR()
+function shall fail if:
+.TP
+.BR EINVAL
+The
+.IR name
+argument points to an empty string, or points to a
+string containing an
+.BR '=' 
+character.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+Refer to the RATIONALE section in
+.IR "\fIsetenv\fR\^(\|)".
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIgetenv\fR\^(\|)",
+.IR "\fIsetenv\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2008,
+.IR "\fB<stdlib.h>\fP",
+.IR "\fB<sys_types.h>\fP"
+.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 .