| df | Reports information about space on file systems. |
| . | The current working directory. |
| .. | The directory above the current working directory (the parent directory). |
| ~ | Your home directory (this is not true for the Bourne Shell). |
| $HOME | Your home directory (this is true for all shells). |
| cd | Changes the current directory. |
| cp | Copies files or directories. |
| dircmp | Compares two directories and the contents of their common files. |
| ls | Displays the contents of a directory. |
| mkdir | Creates one or more new directories. |
| mvdir | Moves (renames) a directory. |
| pwd | Displays the path name of the working directory. |
| rmdir | Removes a directory. |
Chapter 4, Input and Output Redirection
Chapter 8, Backup Files and Storage Media
Chapter 9, File and System Security