eval - Evaluate a Tcl script
eval arg ?arg ...?
Eval takes one or more arguments, which together comprise a Tcl script containing one or more commands. Eval concaten- ates all its arguments in the same fashion as the concat command, passes the concatenated string to the Tcl inter- preter recursively, and returns the result of that evalua- tion (or any error generated by it).
concatenate, evaluate, script