|(operating system)||chroot - The UNIX command to make the root directory (/) become something other than its default for the
lifetime of the current process. It can only be run by
privileged users and is used to give a process (commonly a
network server such as FTP or HTTP) access to a restricted
portion of the file system.|
The new root contains copies of all the essential files and directories, e.g. /lib, /dev/tty, /tmp.