General use:

man	Get information or help about a command
apropos	Locate commands by keyword look up
ls	List directory contents
pwd	Path of working directory
cd	Change working directory
mv	Move file or change name
cp	Copy file
mkdir	Make directory
rm	Remove files and directories
cat	output contents of a file
grep	search for a string of text
mount /mnt/zip	Mount zip disk on directory /mnt/zip
mount /mnt/cdrom	Mount cd disk on directory /mnt/cdrom