Hi all,

I'm reviewing an older Cache routine and came across this line of code: from file ^ZDBKCRON

S $ZT="^%ETSDK"

Error trap

/home/oper/script/cache_db_backup -t        # Daily CacheDB Backup

 produced the following output:

 <NOROUTINE> *%ETSDK
<ERRTRAP>

-----------

From what I understand, this is setting up an error trap, but I'm not entirely clear on how it works, especially in modern InterSystems IRIS environments.

Could someone please help explain:

1. What exactly does this line do?
2. Is %ETSDK a standard system routine? I can't find it in our environment.
3. What is the best practice for error trapping now — should we be using $ETRAP instead of $ZT?
4. How can I safely replace or modernize this code?

Any guidance is appreciated!