Comamnds you should know - Basic UNIX

COMMANDS I KNOW/USE AND YOU WILL LIKELY WANT TO KNOW

tail with -n option
more, less, and cat
grep
curl
which
ps
top
kill
curl with -I option:  curl -I "http://news.ycombinator.com"
free -m 
df (with -h option as well...)
history (v. useful)
Ctrl + C (not a command, more of a terminal action)

OTHER THINGS TO UNDERSTAND ABOUT UNIX - HOMEWORK???

symlinks
permissions (chmod and chown)
ssh
logout
aliases