Code

• For Shell language that are based on process command, the error management is done via the Error code / exit status
• For an block, the error management is done via the exception mechanism

Message

A good error message identifies:

• the problem,
• the cause of the error
• and the solution, if possible

Doc:

• Error Message
• How to Write Good Error Messages

Propagation

Error propagation is when an error that occurs in a block of code is propagated to its caller. This is an exception mechanism.

This is easy in a single thread application but really difficult in multi-thread.