switch_root - switch to another filesystem as the root of the mount tree.
moves already mounted /proc, /dev and /sys to
the new root filesystem and starts
WARNING: switch_root removes recursively all files and directories on the current root filesystem.
show help and exit
show version number and exit
returns 0 on success and 1 on failure.
switch_root will fail to function if
is not the root of a mount. If you want to switch root into a directory that
does not meet this requirement then you can first use a bind-mounting trick to
turn any directory into a mount point: