fakeroot ubuntu manpage的解释如下
fakeroot - run a command in an environment faking root privileges for file manipulation
fakeroot建立一种环境，在里边运行的命令可以以假的root权限操作文件。 读完上面这一句还是不太明白它有什么用，到底怎么用。
下面又有一句
This is useful for allowing users to create archives (tar, ar, .deb
etc.) with files in them with root permissions/ownership. Without fakeroot one would need
to have root privileges to create the constituent files of the archives with the correct
permissions and ownership, and then pack them up, or one would have to construct the
archives directly, without using the archiver.
fakeroot的一般用法是fakeroot – script， script是shell脚本，把需要再root权限执行的命令写在脚本里边。
参考
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