loading= runcom = run command, rc还是plan9的shell rev = REVerse rm = ReMove rn
= Read News roff = RunOFF rpm
= RPM Package Manager = RedHat Package Manager rsh,
rlogin, rvim中的r = Remote rxvt
= ouR XVT
seamoneky = 我 sed
= Stream EDitor seq
= SEQuence shar
= SHell ARchive slrn = S-Lang rn ssh
= Secure SHell ssl
= Secure Sockets Layer
stty = Set TTY su
= Substitute User svn
= SubVersioN tar
= Tape ARchive tcsh
= TENEX C shell tee
= T (T形水管接口) telnet
= TEminaL over Network
termcap
= terminal capability terminfo
= terminal information tex
= τ?χνη的缩写，希腊文art tr = traslate troff
= Typesetter new ROFF tsort
= Topological SORT tty
= TeleTypewriter twm