| Command | Action |
| ls | list the files and subdirectories for the current directory |
| ls -l | list the files and subdirectories for the current directory (long format) |
| cd X | change directory to directory named X |
| cd .. | go up one directory level |
| pwd | Present Working Directory -- identify the name of the current directory |
| date | display date and time |
| man X | display manual pages for command X |
| more X | display contents of file named X |
| mv X Y | move a file; i.e., rename the file X (old) to the name Y (new) |
| cp X Y | copy the file named X as the new file named Y |
| rm X | remove a file; delete file named X |
| rmdir X | remove a directory; delete directory named X |
| mkdir X | make a directory; create directory named X |
| pico X | invoke `pico' text editor for file named X |
Useful information regarding UNIX can be found at innumerable web sites. Some useful sources are