On learning shells

Inspired by pet84rik's phost[0] I have purchased a used copy of Using csh&tcsh. It arrived just now. I think it is time to dig in :D

• [0][gopher://sdf.org/0/users/pet84rik/BLOG/FEB18/Feb20-books](gopher://sdf.org/0/users/pet84rik/BLOG/FEB18/Feb20-books)