Unless you have an extremely old version, the install script should give you several numbered choices, one of which installs the idb. If you are using an evaluation license, take out a new one, if necessary, open an account on premier.intel.com, and download a current compiler.
In order to run idb, there is a separate environment setting script in the debugger installation. You can have either the compiler or debugger or both active.
gdb also works well for some tasks. Then there are several commercial debuggers.
