Processing Errors from Direct Mode and Shell

	Executing in Direct Mode	Executing from the Shell (`mumps -run ^routine`)
Usage	Suitable for development and debugging.	Suitable for production.
Error Handler	Not invoked for code entered at the direct mode prompt; Note that XECUTE code is treated as not entered at the direct mode prompt The default $ZTRAP=“B” brings a process to the Direct Mode for debugging.	Errors are suppressed and cause a silent process exit. Set the environment variable gtm_etrap which overrides the default $ZTRAP=“B”. If needed, error handlers can include appropriate error notification to $PRINCIPAL. For example, the gtmprofile script sets a default $ETRAP value of `"Write:(0=$STACK) ""Error occurred: "",$ZStatus,!"` which you can customize to suit your needs.
stderr	GT.M processes send error messages to stderr only under the following conditions: * The error is fatal which means that the process is about to terminate * During compilation except of indirection or XECUTE * The process is about to enter direct mode due to a BREAK command * The erroneous code was entered at the direct mode prompt * The message is informational, and intended for the user, which is unusual