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 getenv()                Get a Value from the Environment Table

 #include   <stdlib.h>

 char       *getenv(varname);
 const char *varname;                    Name of environment variable

    getenv() searches for an entry corresponding to 'varname'in the list
    of environment variables.

    Returns:    A pointer to the environment table indicating the entry
                that contains the current string value of 'varname'.  If
                'varname' is not currently defined, NULL is returned.

      Notes:    Entries can be changed with putenv().  Use strdup() or
                strcpy() to modify the returned value without affecting
                the environment table.

   -------------------------------- Example ---------------------------------

    The following statements get some environment settings and print them
    out.

           #include <stdlib.h>
           char *pathvar, *libvar;

           main()
           {
               pathvar = getenv("PATH"); /* NULL if no PATH */
               libvar = getenv("LIB");   /* NULL if no LIB setting */
               printf("PATH AND LIB ENVIRONMENT SETTINGS\n");
               printf("\tPATH: %s\n",pathvar);
               printf("\tINCLUDE: %s\n",inclvar);
           }