command line for Ubuntu

Check package status:

dpkg -l | grep packagename

設定開機啟動的服務

sysv-rc-conf

if not work

apt-get install sysv-rc-conf

lsof -iTCP:3000

portsnap fetch update
pkgdb -F
portsdb -Uu
portupgrade -a

tar zxvf / jxvf

IF you tar zxvf xxx.tar.bz2, than get error message like this.

gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error exit delayed from previous errors

try this

tar jxvf xxx.tar.bz2