You really aren't kidding about Tcl. I recently discovered that with tclreadline, Tcl can be used completely in place of Bash in interactive mode, in a way that something like Python absolutely cannot.

A lot of people seem to have negative opinions about Tcl (maybe because it's more of a LISP than its syntax seems to imply), but as someone who is just discovering it, I'm shocked at how powerful it is for how unpopular it seems to have become. It's like some kind of unexpected cross between Bash, LISP, and (with Tk) Visual Basic. There's something about it that's just kind of fun.