see:

The sub cdtcall gets a reference to the %bakjobs hash as an argument and stores it in scalar $bakjobs. Note: %bakjobs and $bakjobs are different variables despite their similar looking names.

Well, $bakjobs is a reference to a hash. $bakjobs->{"$2"} returns a value of a key "$2" for that hash. This value is a hash reference again. And $bakjobs->{"$2"}{"dbt"} is an accessor to value of "dbt" key of %{$bakjobs->{"$2"}} hash.

In reply to Re: Understanding -> function by ccn
in thread Understanding -> function by John007

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