byobu: name a new session

byobu new -s <session-name>

Clojure: if key exists: update, otherwise: assoc

Source : if key exists: update, otherwise: assoc

1 2 3 4

user> (update {:a [1]} :a (fnil conj []) 2) {:a [1 2]} user> (update {:a [1]} :b (fnil conj []) 2) {:a [1], :b [2]}