TCL is pretty old school and doesn't get a lot of attention nowadays. The main use I'm aware of is in BigIP F5 config files. There are some really interesting t

TCL is pretty old school and doesn't get a lot of attention nowadays. The main use I'm aware of is in BigIP F5 config files. There are some really interesting things about it though, for example how control flow constructs (if/else, while) are implemented as commands, using built in uplevel and upvar[1] commands to control the scope of the currently executing code. Some people say it's lisp-like, that's one of the things they mean. TCL has an interesting history, it's creator is also known for Ousthout's Dichotomy[2] which is useful when disambiguating between "scripting" and "other" languages (an argument that occurs frequently on the internet). Antirez has written about TCL, if you're an admirer of him or his work (redis) you may find his take on it interesting[3]. [1] https://en.wikipedia.org/wiki/Tcl#Uplevel https://en.wikipedia.org/wiki/Tcl#Uplevel [2] https://en.wikipedia.org/wiki/Ousterhout%27s_dichotomy https://en.wikipedia.org/wiki/Ousterhout%27s_dichotomy [3] http://antirez.com/articoli/tclmisunderstood.html http://antirez.com/articoli/tclmisunderstood.html