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tcsh has a (maybe) unique command line editing feature: transpose characters.

Ctrl-T

It's vi mode is not as good as libedit's (IMHO) yet each shares the same author/maintainer.

Though it's no longer the default, I believe tcsh may still be included with MacOS.

Ctrl+T does transpose-characters (and Alt+T transpose-words) in Emacs. I assume it's not a coincidencce, I see tcsh has `bindkey -e` / `-v` for Emacs/VI bindings. Same keys work in bash too (and anything else that uses readline) and fish too (independent editing implementation).

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