Common Commands
View Directories: ls
The ls (LiSt) lists files in different colors with full formatted text
Create Directories: mkdir (directory name)
The mkdir (MaKeDIRectory) command will create a directory.
Change Directories: cd (/directory/location)
The cd (ChangeDirectory) command will change from your current directory to any directory you specify.
Copy Files/Directories: cp (file or directory name) (to directory or filename)
The cp (CoPy) command will copy any files you specify. The cp -r command will copy any directories you specify.
Remove Files/Directories: rm (file or directory name)
The rm (ReMove) command will delete any filename you specify. The rm -r command will remove any directory you specify.
Rename Files/Directories: mv (file or directory name)
The mv (MoVe) command will rename/move any file or directory you specify.
Find Files/Directories: 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
cd..orcd ..Note there is a space. – andrewsomething Aug 24 '12 at 03:32