/system # rm -rf *
rm: can't remove 'lost+found': Directory not empty
/system # ls
lost+found
/system # ls -als
  16 drwxr-xr-x    1 root     root         16384 Jul 28 10:40 .
   0 drwxr-xr-x   19 root     root             0 Jul 28 10:37 ..
  16 drw-rw-rw-    1 root     root         16384 Jul 28 10:38 lost+found
/system # cd lost\+found/
/system/lost+found # ls -als
  16 drw-rw-rw-    1 root     root         16384 Jul 28 10:38 .
  16 drwxr-xr-x    1 root     root         16384 Jul 28 10:40 ..
/system/lost+found # cd ..
/system # df -h
Filesystem                Size      Used Available Use% Mounted on
tmpfs                    71.7M     32.0K     71.7M   0% /dev
/dev/block/mtdblock4     40.0M     36.1M      3.9M  90% /cache
/dev/block/mmcblk0p1      1.8G    950.9M    932.9M  50% /sdcard
/dev/block/mtdblock2    152.0M     36.0M    116.0M  24% /system
/system #