ls：list(列出目录内容)

cd：Change Directory（改变目录）

su:switch user 切换用户
rpm:redhat package manager 红帽子打包管理器
pwd:print work directory 打印当前目录 显示出当前工作目录的绝对路径
ps: process status(进程状态，类似于windows的任务管理器) 常用参数：－auxf
ps -auxf 显示进程状态
df: disk free 其功能是显示磁盘可用空间数目信息及空间结点信息。换句话说，就是报告在任何安装的设备或目录中，还剩多少*的空间。

rmdir：Remove Directory（删除目录）

rm：Remove（删除目录或文件）

cat: concatenate连锁 cat file1 file2>>file3把文件1和文件2的内容联合起来放到file3中
insmod: install module,载入模块
ln: Link files

ln -s : link -soft 创建一个软链接，相当于创建一个快捷方式

mkdir：Make Directory(创建目录

touch: 

man: Manual 手册、指南
mkfs: Make file system
fsck：File system check
uname: Unix name
du: Disk usage
lsmod: List modules
mv: Move file
cp: Copy file
fg: Foreground
bg: Background
chown: Change owner
chgrp: Change group
chmod: Change mode
umount: Unmount
dd: 本来应根据其功能描述“Convert an copy”命名为“cc”，但“cc”已经被用以代表“C Complier”，所以命名为“dd”

dd = Disk Dump
tar：Tape archive
ldd：List dynamic dependencies
rmmod：Remove module
文件结尾的"rc"（如.bashrc、.xinitrc等）：Resource configuration
Knnxxx / Snnxxx（位于rcx.d目录下）：K（Kill）；S(Service)；nn（执行顺序号）；xxx（服务标识）
.a（扩展名a）：Archive，static library
.so（扩展名so）：Shared object，dynamically linked library
.o（扩展名o）：Object file，complied result of C/C++ source file
RPM：Red hat package manager
dpkg：Debian package manager
apt：Advanced package tool（Debian或基于Debian的发行版中提供）

bin = BINaries #下面的是一些二进制程序文件

/dev = DEVices  #下面的是一些硬件驱动

/etc = ETCetera #目录存放着各种系统配置文件, 类似于windows下的system

/lib = LIBrary

/proc = PROCesses

/sbin = Superuser BINaries

/tmp = TeMPorary

/usr = Unix Shared Resources 

/var = VARiable ?

/boot=boot #下面的是开机启动文件

FIFO = First In, First Out

GRUB = GRand Unified Bootloader

IFS = Internal Field Seperators

LILO = LInux LOader

MySQL = My是最初作者女儿的名字，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 得名于电视剧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" 三个作者的姓的第一个字母

bash = Bourne Again SHell

bc = Basic (Better) Calculator

biff = 作者Heidi Stettner在U.C.Berkely养的一条狗,喜欢对邮递员汪汪叫。

cal = CALendar

chsh = CHange SHell

cmp = compare

cobra = Common Object Request Broker Architecture

comm = common

cpio = CoPy In and Out

cpp = C Pre Processor

cron = Chronos 希腊文时间

cups = Common Unix Printing System

cvs = Current Version System

daemon = Disk And Execution MONitor

dc = Desk Calculator

diff = DIFFerence

dmesg = diagnostic message

ed = editor

egrep = Extended GREP

elf = Extensible Linking Format

elm = ELectronic Mail

emacs = Editor MACroS

eval = EVALuate

ex = EXtended

exec = EXECute

fd = file descriptors

fgrep = Fixed GREP

fmt = format

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

lpr = Line PRint

lsof = LiSt Open Files

m4 = Macro processor Version 4

mawk = Mike Brennan‘s AWK

mc = Midnight Commander

mknod = MaKe NODe

motd = Message of The Day

mozilla = MOsaic GodZILLa

mtab = Mount TABle

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 = 拟声 又 = Packet InterNet Grouper

pirntcap = PRINTer CAPability

popd = POP Directory

pr = pre

printf = PRINT Formatted

pty = pseudo tty

pushd = PUSH Directory

rc = runcom = run command, rc还是plan9的shell

rev = REVerse

rn = Read News

roff = RunOFF

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

svn = SubVersioN

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 = 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

MIME = Multipurpose Internet Mail Extensions

ECMA = European Computer Manufacturers Association