getenv - get value of environment variable

Syntax	#include <stdlib.h> char *getenv(const char *name);
Description	getenv() searches the current environment of the process, i.e. the string array pointed to by environ, for a string of the form "name=value" and returns a pointer to the string containing the value for the specified variable name. getenv() is not thread-safe.
Return val.	Pointer to a string with value of name
		if a corresponding string exists.
	Null pointer	if no corresponding string exists.
Notes	The string "name=value" cannot be altered, but may be overwritten by subsequent putenv calls. Other library functions do not overwrite the string. BS2000 The string array to which environ points can be initialized with values from the SDF-P variable SYSPOSIX.name on starting the program (see environ and the section Environment variables”). (End)
See also	exec, environ, putenv(), setenv(), unsetenv(), stdlib.h, and section Environment variables”.