In ASIC design (that's what the commenter probably refers to when mentioning IC), just like in the more widespread FPGA world: many of the proprietary expensive

In ASIC design (that's what the commenter probably refers to when mentioning IC), just like in the more widespread FPGA world: many of the proprietary expensive tools are exposing their functionality as aTCL scripting engine. While the graphical tools hide this to some extent, as soon as you go for automation, which is unavoidable for complex work, you'll find yourself to write scripts in the TCL language.