If a Core File Exists

If a file named core exists in the directory where you start dbx, it is not read in by default; you must explicitly request the core file. Use the where command to see where the program was executing when it dumped core.

To debug a core file, type:

$ dbx program_name
 core

When you debug a core file, you can also evaluate variables and expressions to see what values they had at the time the program crashed, but you cannot evaluate expressions that make function calls.