ls：list(列出目錄內容)
cd：Change Directory（改變目錄）
su：switch user 切換使用者
rpm：redhat package manager 紅帽子打包管理器
pwd：print working directory 列印當前目錄，顯示出當前工作目錄的絕對路徑
ps：process status(程序狀態，類似於windows的工作管理員) 常用引數：－auxf
ps -auxf 顯示程序狀態
df：disk free 其功能是顯示磁碟可用空間數目資訊及空間結點資訊。換句話說，就是報告在任何安裝的裝置或目錄中，還剩多少自由的空間。
rpm：即RedHat Package Management，是RedHat的發明之一
rmdir：Remove Directory（刪除目錄）
rm：Remove（刪除目錄或檔案）
cat：concatenate連鎖 cat file1 file2>>file3把檔案1和檔案2的內容聯合起來放到file3中
insmod：install module,載入模組
ln -s：link -soft 建立一個軟連結，相當於建立一個快捷方式
mkdir：Make Directory(建立目錄
touch：修改檔案日期
man：Manual
mkdir：Make directory 建立目錄
mkfs：Make file system
fsck：File system check
uname：Unix name
df：Disk free
du：Disk usage
lsmod：List modules
mv：Move file
rm: Remove file
cp: Copy file
ln: Link files
fg: Foreground
bg: Background
chown: Change owner
chgrp: Change group
chmod: Change mode
umount: Unmount
dd: 本來應根據其功能描述“Convert an copy”命名為“cc”，但“cc”已經被用以代表“C Complier”，所以命名為“dd”
tar：Tape archive
ldd：List dynamic dependencies
insmod：Install module
rmmod：Remove module
lsmod：List module
檔案結尾的"rc"（如.bashrc、.xinitrc等）：Resource configuration
Knnxxx / Snnxxx（位於rcx.d目錄下）：K（Kill）；S(Service)；nn（執行順序號）；xxx（服務標識）
.a（副檔名a）：Archive，static library
.so（副檔名so）：Shared object，dynamically linked library
.o（副檔名o）：Object file，complied result of C/C++ source file
RPM：Red hat package manager
dpkg：Debian package manager
apt：Advanced package tool（Debian或基於Debian的發行版中提供）
部分Linux命令縮
bin = BINaries #下面的是一些二進位制程式檔案
/dev = DEVices  #下面的是一些硬體驅動
/etc = ETCetera #目錄存放著各種系統配置檔案, 類似於windows下的system
/lib = LIBrary
/proc = PROCesses
/sbin = Superuser BINaries
/tmp = TeMPorary
/usr = Unix Shared Resources 
/var = VARiable ?
/boot=boot #下面的是開機啟動檔案
FIFO = First In, First Out
GRUB = GRand Unified Bootloader
IFS = Internal Field Seperators
LILO = LInux LOader
MySQL = My是最初作者女兒的名字，SQL = Structured Query Language
PHP = Personal Home Page Tools = PHP Hypertext Preprocessor
PS = Prompt String
Perl = "Pratical Extraction and Report Language" = "Pathologically Eclectic Rubbish Lister"
Python 得名於電視劇Monty Python's Flying Circus
Tcl = Tool Command Language
Tk = ToolKit
VT = Video Terminal
YaST = Yet Another Setup Tool
apache = "a patchy" server
apt = Advanced Packaging Tool
ar = archiver
as = assembler
awk = "Aho Weiberger and Kernighan" 三個作者的姓的第一個字母
bash = Bourne Again SHell
bc = Basic (Better) Calculator
bg = BackGround
biff = 作者Heidi Stettner在U.C.Berkely養的一條狗,喜歡對郵遞員汪汪叫。
cal = CALendar
cat = CATenate
cd = Change Directory
chgrp = CHange GRouP
chmod = CHange MODe
chown = CHange OWNer
chsh = CHange SHell
cmp = compare
cobra = Common Object Request Broker Architecture
comm = common
cp = CoPy
cpio = CoPy In and Out
cpp = C Pre Processor
cron = Chronos 希臘文時間
cups = Common Unix Printing System
cvs = Current Version System
daemon = Disk And Execution MONitor
dc = Desk Calculator
dd = Disk Dump
df = Disk Free
diff = DIFFerence
dmesg = diagnostic message
du = Disk Usage
ed = editor
egrep = Extended GREP
elf = Extensible Linking Format
elm = ELectronic Mail
emacs = Editor MACroS
eval = EVALuate
ex = EXtended
exec = EXECute
fd = file descriptors
fg = ForeGround
fgrep = Fixed GREP
fmt = format
fsck = File System ChecK
fstab = FileSystem TABle
fvwm = F*** Virtual Window Manager
gawk = GNU AWK
gpg = GNU Privacy Guard
groff = GNU troff
hal = Hardware Abstraction Layer
joe = Joe's Own Editor
ksh = Korn SHell
lame = Lame Ain't an MP3 Encoder
lex = LEXical analyser
lisp = LISt Processing = Lots of Irritating Superfluous Parentheses
ln = LiNk
lpr = Line PRint
ls = list
lsof = LiSt Open Files
m4 = Macro processor Version 4
man = MANual pages
mawk = Mike Brennan's AWK
mc = Midnight Commander
mkfs = MaKe FileSystem
mknod = MaKe NODe
motd = Message of The Day
mozilla = MOsaic GodZILLa
mtab = Mount TABle
mv = MoVe
nano = Nano's ANOther editor
nawk = New AWK
nl = Number of Lines
nm = names
nohup = No HangUP
nroff = New ROFF
od = Octal Dump
passwd = PASSWorD
pg = pager
pico = PIne's message COmposition editor
pine = "Program for Internet News & Email" = "Pine is not Elm"
ping = 擬聲 又 = Packet InterNet Grouper
pirntcap = PRINTer CAPability
popd = POP Directory
pr = pre
printf = PRINT Formatted
ps = Processes Status
pty = pseudo tty
pushd = PUSH Directory
pwd = Print Working Directory
rc = runcom = run command, rc還是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形水管介面)
telnet = TEminaL over Network
termcap = terminal capability
terminfo = terminal information
tex = τέχνη的縮寫，希臘文art
tr = traslate
troff = Typesetter new ROFF
tsort = Topological SORT
tty = TeleTypewriter
twm = Tom's Window Manager
tz = TimeZone
udev = Userspace DEV
ulimit = User's LIMIT
umask = User's MASK
uniq = UNIQue
vi = VIsual = Very Inconvenient
vim = Vi IMproved
wall = write all
wc = Word Count
wine = WINE Is Not an Emulator
xargs = eXtended ARGuments
xdm = X Display Manager
xlfd = X Logical Font Description
xmms = X Multimedia System
xrdb = X Resources DataBase
xwd = X Window Dump
yacc = yet another compiler compiler
Fish = the Friendly Interactive SHell
su = Switch User
MIME = Multipurpose Internet Mail Extensions
ECMA = European Computer Manufacturers Association