Summary

To see a file screen by screen	more filename
To see the first few lines of a file	head filename
To see the last few lines of a file	tail filename
To make a directory	mkdir dirname
To remove an empty directory	rmdir dirname
To copy a file	cp filename another_filename
To rename a file	mv filename new_filename
To remove a file	rm filename

For more information about	See
Looking at files screen by screen	more(C)
Looking at the beginning of a file	head(C)
Looking at the end of a file	tail(C)
Making directories	mkdir(C)
Removing directories	rmdir(C)
Copying files	cp(C)
Renaming files	mv(C)
Removing files	rm(C)