getenv(3c) [hpux man page]

getenv(3C)																getenv(3C)

NAME

       getenv() - return value for environment name

SYNOPSIS

DESCRIPTION

       searches  the  environment  list (see environ(5)) for a string of the form and returns a pointer to the value in the current environment if
       such a string is present or a NULL pointer if it is not.  name can be either the desired name, null-terminated, or of  the  form  in  which
       case uses the portion to the left of the as the search key.

       If the optional HP Getenv-Perf-Enh product is installed on the system, the performance of in threaded applications may increase.

WARNINGS

       returns a pointer to static data which can be overwritten by subsequent calls.

EXTERNAL INFLUENCES

   Locale
       The category determines the interpretation of characters in name as single and/or multibyte characters.

   International Code Set Support
       Single and multibyte character code sets are supported.

SEE ALSO

       exec(2), putenv(3C), environ(5), thread_safety(5).

STANDARDS CONFORMANCE

																	getenv(3C)

getenv(3)						     Library Functions Manual							 getenv(3)

Name
       getenv, setenv, unsetenv  - manipulate environment variables

Syntax
       char *getenv(name)
       char *name;

       setenv(name, value, overwrite)
       char *name, value;
       int overwrite;

       void unsetenv(name)
       char *name;

Description
       The  subroutine	searches  the  environment  list for a string of the form name = value and returns a pointer to the string value if such a
       string is present, otherwise returns the value 0 (NULL).  For further information, see

       The subroutine searches the environment list in the same manner as If the string name is not found, a string  of  the  form  name=value	is
       added  to  the environment.  If it is found, and overwrite is non-zero, its value is changed to value.  The subroutine returns 0 on success
       and -1 on failure, where failure is caused by an inability to allocate space for the environment.

       The subroutine removes all occurrences of the string name from the environment.	There is no library provision for completely removing  the
       current environment.  It is suggested that the following code be used to do so.
       static char     *envinit[1];
       extern char     **environ;
       environ = envinit;
       All of these routines permit, but do not require, a trailing equals sign (=) on name or a leading equals sign on value.

See Also
	csh(1), sh(1), execve(2), putenv(3), environ(7)

																	 getenv(3)