PUTENV Section: Linux Programmer's Manual (3) Updated: April 8, 2025 Index   NAME putenv - change or add an environment variable   SYNOPSIS #include <stdlib.h> int putenv(const char *string);   DESCRIPTION The putenv() function adds or changes the value of environment variables. The argument string is of the form name=value. If name does not already exist in the environment, then string is added to the environment. If name does exist, then the value of name in the environment is changed to value.   RETURN VALUE The putenv() function returns zero on success, or -1 if an error occurs.   ERRORS ENOMEM Insufficient space to allocate new environment.   CONFORMING TO SVID 3, POSIX, BSD 4.3   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION RETURN VALUE ERRORS CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:58:05 GMT, March 24, 2025