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-.\" Copyright (c) 1988, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" the American National Standards Committee X3, on Information
-.\" Processing Systems.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)getenv.3	8.2 (Berkeley) 12/11/93
-.\"
-.Dd December 11, 1993
-.Dt GETENV 3
-.Os
-.Sh NAME
-.Nm getenv ,
-.Nm putenv ,
-.Nm setenv ,
-.Nm unsetenv
-.Nd environment variable functions
-.Sh SYNOPSIS
-.Fd #include <stdlib.h>
-.Ft char *
-.Fn getenv "const char *name"
-.Ft int
-.Fn setenv "const char *name" "const char *value" "int overwrite"
-.Ft int
-.Fn putenv "const char *string"
-.Ft void
-.Fn unsetenv "const char *name"
-.Sh DESCRIPTION
-These functions set, unset and fetch environment variables from the
-host
-.Em environment list .
-For compatibility with differing environment conventions,
-the given arguments
-.Ar name
-and
-.Ar value
-may be appended and prepended, 
-respectively,
-with an equal sign
-.Dq Li \&= .
-.Pp
-The
-.Fn getenv
-function obtains the current value of the environment variable,
-.Ar name .
-If the variable
-.Ar name
-is not in the current environment,
-a null pointer is returned.
-.Pp
-The
-.Fn setenv
-function inserts or resets the environment variable
-.Ar name
-in the current environment list.
-If the variable
-.Ar name
-does not exist in the list,
-it is inserted with the given
-.Ar value.
-If the variable does exist, the argument
-.Ar overwrite
-is tested; if
-.Ar overwrite is
-zero, the
-variable is not reset, otherwise it is reset
-to the given
-.Ar value .
-.Pp
-The
-.Fn putenv
-function takes an argument of the form ``name=value'' and is
-equivalent to:
-.Bd -literal -offset indent
-setenv(name, value, 1);
-.Ed
-.Pp
-The
-.Fn unsetenv
-function
-deletes all instances of the variable name pointed to by
-.Fa name
-from the list.
-.Sh RETURN VALUES
-The functions
-.Fn setenv
-and
-.Fn putenv
-return zero if successful; otherwise the global variable
-.Va errno
-is set to indicate the error and a
-\-1 is returned.
-.Sh ERRORS
-.Bl -tag -width [ENOMEM]
-.It Bq Er ENOMEM
-The function
-.Fn setenv
-or
-.Fn putenv
-failed because they were unable to allocate memory for the environment.
-.El
-.Sh SEE ALSO
-.Xr csh 1 ,
-.Xr sh 1 ,
-.Xr execve 2 ,
-.Xr environ 7
-.Sh STANDARDS
-The
-.Fn getenv
-function conforms to
-.St -ansiC .
-.Sh HISTORY
-The functions
-.Fn setenv
-and
-.Fn unsetenv
-appeared in
-.At v7 .
-The
-.Fn putenv
-function appeared in
-.Bx 4.3 Reno .