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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\" and Copyright (C) 2004, 2007 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\"     386BSD man pages
-.\" Modified Sat Jul 24 18:20:58 1993 by Rik Faith (faith@cs.unc.edu)
-.\" Modified Fri Feb 14 21:47:50 1997 by Andries Brouwer (aeb@cwi.nl)
-.\" Modified 9 Jun 2004, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"     Changed unsetenv() prototype; added EINVAL error
-.\"     Noted nonstandard behavior of setenv() if name contains '='
-.\" 2005-08-12, mtk, glibc 2.3.4 fixed the "name contains '='" bug
-.\"
-.TH setenv 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-setenv \- change or add an environment variable
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdlib.h>
-.P
-.BI "int setenv(const char *" name ", const char *" value ", int " overwrite );
-.BI "int unsetenv(const char *" name );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR setenv (),
-.BR unsetenv ():
-.nf
-    _POSIX_C_SOURCE >= 200112L
-        || /* glibc <= 2.19: */ _BSD_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR setenv ()
-function adds the variable
-.I name
-to the
-environment with the value
-.IR value ,
-if
-.I name
-does not
-already exist.
-If
-.I name
-does exist in the environment, then
-its value is changed to
-.I value
-if
-.I overwrite
-is nonzero;
-if
-.I overwrite
-is zero, then the value of
-.I name
-is not changed (and
-.BR setenv ()
-returns a success status).
-This function makes copies of the strings pointed to by
-.I name
-and
-.I value
-(by contrast with
-.BR putenv (3)).
-.P
-The
-.BR unsetenv ()
-function deletes the variable
-.I name
-from
-the environment.
-If
-.I name
-does not exist in the environment,
-then the function succeeds, and the environment is unchanged.
-.SH RETURN VALUE
-.BR setenv ()
-and
-.BR unsetenv ()
-functions return zero on success,
-or \-1 on error, with
-.I errno
-set to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-.I name
-is NULL, points to a string of length 0,
-or contains an \[aq]=\[aq] character.
-.TP
-.B ENOMEM
-Insufficient memory to add a new variable to the environment.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR setenv (),
-.BR unsetenv ()
-T}	Thread safety	MT-Unsafe const:env
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, 4.3BSD.
-.P
-Prior to glibc 2.2.2,
-.BR unsetenv ()
-was prototyped
-as returning
-.IR void ;
-more recent glibc versions follow the
-POSIX.1-compliant prototype shown in the SYNOPSIS.
-.SH CAVEATS
-POSIX.1 does not require
-.BR setenv ()
-or
-.BR unsetenv ()
-to be reentrant.
-.SH BUGS
-POSIX.1 specifies that if
-.I name
-contains an \[aq]=\[aq] character, then
-.BR setenv ()
-should fail with the error
-.BR EINVAL ;
-however, versions of glibc before glibc 2.3.4 allowed an \[aq]=\[aq] sign in
-.IR name .
-.SH SEE ALSO
-.BR clearenv (3),
-.BR getenv (3),
-.BR putenv (3),
-.BR environ (7)