Australia photo & PC memo

    * OSTYPE (OS type)
    * USER (your login name)
    * HOME (the path name of your home directory)
    * HOST (the name of the computer you are using)
    * ARCH (the architecture of the computers processor)
    * DISPLAY (the name of the computer screen to display X windows)
    * PRINTER (the default printer to send print jobs)
    * PATH (the directories the shell should search to find a command)

$ apropos keyword

Install the SUN Java (at least 5.0)
$ sudo update-java-alternatives -s java-1.x.x-sun
$ eclipse -vm /usr/lib/jvm/java-1.x.x-sun/jre/bin/java
* you might need to use sudo to create some files at the first time.

PermitRootLogin no
PermitEmptyPasswords no
PasswordAuthentication no
AllowUsers hoge
CheckHostIP yes