(more does not page if its stdout is not a terminal)
more < /etc/passwd | less
Sure I could use "<something.txt grep something", but that requires me to decide to use grep right off the bat, something I hardly ever do. Usually I want to look at it first.
<input-file grep stuff
Print lines X-Y to X of a file. :D
sed -ne 'X,Yp' /etc/passwd
I should learn to use sed properly.