The DEBUG=$DEBUG ensures that DEBUG exists in the environment for the awk.
But it's pure overhead if it was already in the shell's environment.
You can achieve the same with an exported variable (exported = placed in the shell's environment)
Because DEBUG is in the shell's environment, all the run commands inherit it.
The use of ENVIRON[ ] in an awk script is interesting. Thanks for sharing!
It is not used often. Reason: when awk is run from the shell there is easy passing of variables.
The Posix style:
Or the (bit dirty) Unix awk style
Either invocation sets the DEBUG variable in awk, so there is no need for pulling it from ENVIRON[ ]
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