| Abbreviation | Definition |
|---|---|
| co | Check Out |
| comm | COMMon |
| cp | Copy |
| cpio | CoPy archive files In and Out |
| cpp | C Pre-Processor |
| cron | ChRONos |
| CSHRC | C Shell Run Commands |
| cURL | Client URL Request Library |
| dbx | eXtended DeBugger |
| dc | Desk Calculator |
| diff | DIFFerence |
| diff3 | DIFFerences of Three files |
| dirname | DIRectory NAME |
| ed | EDitor |
| egrep | Extended GREP |
| elm | ELectronic Mail |
| eqn | Equation |
| eval | evaluate |
| expr | expression |
| fgrep | fixed-string grep |