Code:
cd /filepath/here/
This allows you change directory. By including a trailing slash before your request, you are asking to take yourself to the root of the server before processing the request. By placing two periods and then a trailing slash (../), you are asking to go up one directory and then to process the request. By placing a single period and then a trailing slash (./), you are asking to process the request from the directory that you are in.

Code:
ls -al
This will list all of the files/folders that are in directory that you are currently in.

Code:
rm filename.html
This will remove the specified file.

Code:
cp filename.html /filepath
This will copy "filename.html" to the folder "filepath," located at the root of the server.

Code:
mv filename.html /filepath
This will move "filename.html" to the folder "filepath," located at the root of the server.

Code:
clear
This will clear your screen.

Code:
cat filename.html
This command can be used to display the contents of the specified file.

Code:
grep example filename.html
This command will display each line in "filename.html" that contains the word "example." (case-sensitive)

Code:
grep -i example filename.html
This command will display each line in "filename.html" that contains the word "example." (not case-sensitive)

Code:
grep 'example two' filename.html
Use single-quotes when you need to find a phrase.

Code:
wc filename.html
This will process a word count on "filename.html."

That's a very basic rundown on how Unix works.

There is a lot more to it, and I wouldn't get too cocky and tell everyone that you're able to use Unix to help produce works of art -- you're still a fairly large milestone away.