	To access the full capabilities of sdb or xdb, compile the source with the -g
	option: 
	
		$ cc -g -o fn fn.c
	
			-OR-
	
		$ c89 -g -o fn fn.c    (HP-UX)
	
	The -g option will cause the compiler to supply more information to 
	the executable file for use by sdb/xdb.  
	
	sdb/xdb allows for up to three arguments:  
	
		1) The name of the executable to be invoked in debug mode.  
			The default is a.out.
	
		2) The name of a core image file.  sdb/xdb will always access the core 
			file by default, and display the source line at which the core 
			file was created as the current line.  If there is no core file, 
			sdb/xdb will display a warning ("no process") at invocation.  To 
			ignore an existant core file, append a '-' to the command:
	
				$ sdb fn -
	
					-OR-
	
				$ xdb fn -
	
		3) A colon-separated list of directories describing the location of 
			the source files that were used in creating the executable.  The 
			current directory is used by default.
	
