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