Print the sequence of commands between two command descriptors
Examples:
:pcs 1 5 ; print commands 1 through 5
:pcs 5 1 ; same as above
:pcs :x (:x -3) ; print the 3 most recently executed commands
:pcs fn assoc-of-fn ; print the commands between the one that introduced
; fn and the one that introduced assoc-of-fn
For a related utility that simply returns a sequence of commands, see get-command-sequence.