Man Pages

getenv(3) - phpMan getenv(3) - phpMan

Command: man perldoc info search(apropos)  


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 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               2008-03-17                         GETENV(3)