ディレクトリの意味
Directory Description
http://www.pathname.com/fhs/pub/fhs-2.3.html#THEROOTFILESYSTEM
bin : Essential command binaries
boot : Static files of the boot loader
dev : Device files
etc : Host-specific system configuration
lib : Essential shared libraries and kernel modules
media : Mount point for removeable media
mnt : Mount point for mounting a filesystem temporarily
opt : Add-on application software packages
sbin : Essential system binaries
srv : Data for services provided by this system
tmp : Temporary files
usr : Secondary hierarchy
var : Variable data
