ls (LiSt) lists files in different colors with full formatted text
mkdir (directory name)
mkdir (MaKeDIRectory) command will create a directory.
cd (ChangeDirectory) command will change from your current directory to any directory you specify.
cp (file or directory name) (to directory or filename)
cp (CoPy) command will copy any files you specify. The
cp -r command will copy any directories you specify.
rm (file or directory name)
rm (ReMove) command will delete any filename you specify. The
rm -r command will remove any directory you specify.
mv (file or directory name)
mv (MoVe) command will rename/move any file or directory you specify.
locate (file or directory name)
to go back to previous directory:
cd ..(cd [space] ..)
just for extra information
source from http://linux.about.com/od/ubuntu_doc/a/ubudg24t7.htm