Learn 10 good UNIX usage habbits

I saw this on slashdot, and figured it would be interesting.
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   1.  Make directory trees in a single swipe.
   2. Change the path; do not move the archive.
   3. Combine your commands with control operators.
   4. Quote variables with caution.
   5. Use escape sequences to manage long input.
   6. Group your commands together in a list.
   7. Use xargs outside of find.
   8. Know when grep should do the counting -- and when it should step aside.
   9. Match certain fields in output, not just lines.
  10. Stop piping cats.