$ unshare -rm bash
# mount -t tmpfs -o size=1M rootfs /mnt
# mount --bind /mnt /mnt
# mount -t tmpfs dummydev /mnt
# mount --move /mnt /
# uu-df
......
Filesystem 1K-blocks Used Available Use% Mounted on
......
rootfs 1024 0 1024 0% /mnt
dummydev 118283244 7190584 109404248 7% /
# uu-df -a
Filesystem 1K-blocks Used Available Use% Mounted on
......
rootfs 1024 0 1024 0% /mnt
dummydev 118283244 7190648 109404184 7% /
# gnu-df
Filesystem 1K-blocks Used Available Use% Mounted on
dummydev 118283244 7190504 109404328 7% /
......
rootfs 1024 0 1024 0% /mnt
# gnu-df -a
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 - - - - /
......
rootfs 1024 0 1024 0% /mnt
rootfs 1024 0 1024 0% /mnt
dummydev 118283244 7190616 109404216 7% /
