| Unix/Linux | OS-9 | Description |
| ls | dir | Overview of files in a directory
|
| rm | del | Erase files
|
| cp | copy | Copy files
|
| cat | list | List files
|
| cd | chd | Change data directory
|
| mkdir | makdir | Create new directory
|
| rmdir | deldir | Remove directory
|
| pwd | pd | Show current data directory
|
| jobs | procs | Show active processes
|
| kill | kill | Kill active process
|
| fg | w/wait | Select active process
|
| chmod | attr | Change file attributes and access rights
|
| sz/rz/rx | kermit | Send and receive files
|
| ed | edt | Very limited line-based editor
|
| vi/pico | umacs | Extended full-screen editor
|
| man | help | Displays information about a command
|
| set | set | Set environment variables
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| .profile | .login | Procedure file that is executed at login
|
| logout | logout | Close active user shell
|