| adb | Algol or absolute or advanced debugger |
| ar | archive |
| as | assembler |
| awk | Aho, Weinberger, Kernighan |
| bash | Bourne again shell |
| bc | better or basic calculator |
| bsh | Bourne shell |
| cal | calendar |
| cc | c compiler |
| chgrp | change group |
| chmod | change mode |
| chsh | change shell |
| ci | check in |
| cmp | compare |
| co | check out |
| cp | copy |
| cpio | copy in and out |
| cpp | c pre-processor |
| cron | Chronos (Greek God) |
| csh | c shell |
| ...d | daemon |
| dd | dd |
| df | disk free |
| diff | difference |
| diff3 | differences of three files |
| dirname | directory name |
| du | disk usage |
| ed | editor |
| egrep | extended grep |
| elm | electronic mail |
| emacs | editing macros |
| eqn | equation |
| eval | evaluate |
| fsck | file system check |
| ftp | file transfer protocol |
| g... | GNU |
| GNU | GNU's Not Unix |
| getty | get teletype |
| grep | global regular expression print |
| id | identity |
| irc | interner relay chat |
| jsh | job-cintrol shell |
| ksh | Korn shell |
| lex | lexical analyzer |
| ln | link |
| logname | log-in name |
| lpc |
| lpd | line printer daemon |
| lpr | line print |
| lprm | line printer remove (from queue) |
| ls | list |
| man | manual |
| mkfs | make file system |
| mknod | make node |
| mv | move |
| mvdir | move directory |
| mwm | Motif window manager |
| nawk | new awk |
| nroff | new roff |
| passwd | password |
| pgp | pretty good privacy |
| pico | pine composer |
| povray | persistance of vision raytracer |
| ps | process status |
| pwd | present working directory |
| r... | remote |
| rcp | remote copy |
| rcs | revision control system |
| rlogin | remote login |
| rm | remove |
| rmail | restrict main |
| rmdir | remove directory |
| rsh | remote shell or restricted shell |
| sar | system activity report |
| sed | stream editor |
| sh | shell |
| shar | shell archive |
| stty | set tty |
| su | superuser |
| sync | synchronize |
| tar | tape archive |
| tclsh | Tcl shell |
| tcsh | Tenex C shell |
| tee | T piping fitting |
| telnet | terminal over network |
| tex | tau epsilon chi |
| troff | typesetter off |
| tsh | trusted shell |
| ttt | tic tac toe |
| ulimit | user's limit |
| uname | Unix name |
| uucp | Unix-to-Unix communication protocol |
| vi | visual |
| vim | vi improved |
| wall | write all |
| wc | word count |
| ...wm | window manager |
| xdm | X display manager |
| xdpr | X dump print |
| xfd | X font display |
| xmkmf | X make makefile |
| xrbd | X resource database |
| xwd | X window dump |
| xwud | X window un-dump |
| yacc | yet another compiler compiler |
| zip | Ziv packer |