The Tcl that every EDA flow script is secretly written in — enough of the language to read and write Synopsys, Cadence, and Siemens tool scripts confidently instead of copying incantations you don't understand.
Cadence
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Tcl for EDA Engineers: The Language Every Flow Script Is Secretly Written In -
OpenAccess and OAScript: The Open EDA Database Standard A thorough technical guide to the SI2 OpenAccess EDA database standard and its OAScript Tcl bindings — covering the object model, building from source, the oaScript shell, practical scripting patterns, and how it fits into real IC design flows.