Is there a linux command or some way to look at logs from bottom up rather than from top towards bottom. I know about
tail -n <number of lines>, but is there something that I can actually scroll and go from bottom up?
tac command is like a reverse "cat", if that's what you're after.
If you just want to view a file by starting at the bottom, why don't you use an editor or "less"?
If you are writing a nagios check the perl module File::ReadBackwards is useful