Vim users: If you'd like to highlight the whole line the cursor is on:

:set cursorline

I just used that when examining package output from dpkg -l so that I could easily see which description matched each package.

If you are a user of geeqie (a nice *nix photo viewer) and need to start a second session, but don't want it to interfere with the first, you can use the -n option:

geeqie -n

Check 'man geeqie' for a bunch of other useful options.

Add some spice to your text by randomly coloring each word in a text file.

head -n30 cat_haiku.txt | awk 'BEGIN{srand()} RS=" " {c=int(rand()*200)+32;printf "\033[38;5;" c "m" $0 "\033[0m "}'