Errorf creates a new error and wraps in an Error type that contains the stack trace.

Returns true if actual is the same type of error as expected.

Convert the given error to a string, including the stack trace if available.

A method that tries to recover from panics, and if it succeeds, calls the given onPanic function with an error that explains the cause of the panic.

If the given error is a wrapper that contains a stacktrace, unwrap it and return the original, underlying error.

Use this to wrap every command you add to *cli.App to handle panics by logging them with a stack trace and returning an error up the chain.

Wrap the given error in an Error type that contains the stack trace.

Wrap the given error in an Error type that contains the stack trace and has the given message prepended as part of the error message.

If this error is returned, the program should exit with the given exit code.