watch: show last N lines
Reference: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=567556
for some situations it would be good if watch were able to display the last output lines instead of the first ones (i.e. always run the command to completion).
Use case at hand: "watch 'make 2>&1'", where I'm interested in the errors that terminated the compilation (if any), not in the first 50 or so lines of compiler invocations.