Color support

export LESS='-R'
-R - accept and print "raw control characters"

Add pretty colors to man pages.

export MANPAGER='less -R --use-color -Dd+g -Du+b'

Disable regex search

After you press / to start the search, you can press Ctrl + R to disable regexes.

Cat if less than terminal height

-F Causes less to automatically exit if the entire file can be displayed on the first screen.

-X Disables sending the termcap initialization and deinitialization strings to the terminal. Such as clearing the screen.