Obtains the string value of a specified environment variable #include <stdlib.h> char *getenv ( const char *name ); The getenv( ) function searches the environment variables at runtime for an entry with the specified name, and returns a pointer to the variable's value. If there is no environment variable with the specified name, getenv( ) returns a null pointer. Your program must not modify the string addressed by the pointer returned, and the string at that address may be replaced by subsequent calls to getenv( ). Furthermore, C itself does not define a function to set or modify environment variables, or any list of variable names that you can expect to exist; these features, if available at all, are system-specific. Example#define MAXPATH 1024; char sPath[MAXPATH] = ""; char *pTmp; if (( pTmp = getenv( "PATH" )) != NULL ) strncpy( sPath, pTmp, MAXPATH - 1 ); // Save a copy for our use. else fprintf( stderr, "No PATH variable set.\n") ; See Alsosystem( ) |