GETENV(3)                                           Linux Programmer's Manual                                          GETENV(3)



NAME
       getenv - get an environment variable

SYNOPSIS
       #include <stdlib.h>

       char *getenv(const char *name);

DESCRIPTION
       The  getenv()  function searches the environment list to find the environment variable name, and returns a pointer to the
       corresponding value string.

RETURN VALUE
       The getenv() function returns a pointer to the value in the environment, or NULL if there is no match.

CONFORMING TO
       SVr4, POSIX.1-2001, 4.3BSD, C89, C99.

NOTES
       The strings in the environment list are of the form name=value.

       As typically implemented, getenv() returns a pointer to a string within the environment list.  The caller must take  care
       not to modify this string, since that would change the environment of the process.

       The  implementation  of  getenv() is not required to be reentrant.  The string pointed to by the return value of getenv()
       may be statically allocated, and can be modified by a subsequent call to getenv(), putenv(3), setenv(3), or unsetenv(3).

SEE ALSO
       clearenv(3), putenv(3), setenv(3), unsetenv(3), environ(7)

COLOPHON
       This page is part of release 3.25 of the Linux man-pages project.  A description of the project,  and  information  about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                                                        2008-03-17                                                  GETENV(3)