su：swith user 切換使用者，搜尋引擎大全
切換到root使用者
cat: concatenate 串聯
uname: unix name 系統名稱
df: disk free 空餘硬碟
du: disk usage 硬碟使用率
chown: change owner 改變所有者
chgrp: change group 改變使用者組
ps：process status 程序狀態
tar：tape archive 解壓檔案
chmod: change mode 改變模式
umount: unmount 解除安裝
ldd：list dynamic dependencies 列出動態相依
insmod：install module 安裝模組
rmmod：remove module 刪除模組
lsmod：list module 列表模組
alias :create your own name for a command
bash :gnu bourne-again shell linux核心
mysql = my最初作者的名字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 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
bash = bourne again shell
bc = basic (better) calculator
bg = background
cal = calendar
cat = catenate
cd = change directory
chgrp = change group
chmod = change mode
chown = change owner
chsh = change shell
cmp = compare
copa = common object request poker architecture
comm = common
cp = copy
cpio = copy in and out
cpp = c pre processor
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
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