[Galaxy Grand 2 Original Android Development] DevelopersWork:
I Get Error like this

C:\Program Files (x86)\Android\android-sdk\platform-tools>adb devices
List of devices attached
56ce5bbe device

C:\Program Files (x86)\Android\android-sdk\platform-tools>adb shell
←7←[r←[999;999H←[6n←8root@ms013g:/ # u
/system/bin/sh: u: not found
127|root@ms013g:/ # mount
rootfs on / type rootfs (ro,seclabel,relatime)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,relatime,size=695336k,nr_inodes=130580,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,relatime,mode=600)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,seclabel,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
/sys/kernel/debug on /sys/kernel/debug type debugfs (rw,seclabel,relatime)
none on /acct type cgroup (rw,relatime,cpuacct)
none on /sys/fs/cgroup type tmpfs (rw,seclabel,relatime,size=695336k,nr_inodes=130580,mode=750,gid=1000)
tmpfs on /mnt type tmpfs (rw,seclabel,relatime,size=695336k,nr_inodes=130580,mode=755,gid=1000)
none on /dev/cpuctl type cgroup (rw,relatime,cpu)
none on /sys/fs/cgroup/bfqio type cgroup (rw,relatime,bfqio)
/dev/block/mmcblk0p22 on /system type ext4 (ro,seclabel,relatime,data=ordered)
/dev/block/mmcblk0p25 on /data type ext4 (rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc,data=ordered)
/dev/block/mmcblk0p23 on /cache type ext4 (rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc,data=ordered)
/dev/block/mmcblk0p1 on /firmware type vfat (ro,context=u:object_r:firmware_file:s0,relatime,uid=1000,gid=1026,fmask=0333,dmask=0222,codepage=cp437,iocharset=is
/dev/block/mmcblk0p2 on /firmware-modem type vfat (ro,context=u:object_r:firmware_file:s0,relatime,uid=1000,gid=1026,fmask=0337,dmask=0227,codepage=cp437,iochar
/dev/block/mmcblk0p21 on /persist type ext4 (rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc,data=ordered)
/dev/block/mmcblk0p11 on /efs type ext4 (rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc,data=ordered)
tmpfs on /storage type tmpfs (rw,seclabel,relatime,size=695336k,nr_inodes=130580,mode=755,gid=1000)
/dev/fuse on /mnt/runtime/default/emulated type fuse (rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other)
/dev/fuse on /storage/emulated type fuse (rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other)
/dev/fuse on /mnt/runtime/read/emulated type fuse (rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other)
/dev/fuse on /mnt/runtime/write/emulated type fuse (rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other)
/dev/block/vold/public:179_65 on /mnt/media_rw/385F-1C17 type vfat (ro,dirsync,nosuid,nodev,noexec,relatime,uid=1023,gid=1023,fmask=0007,dmask=0007,allow_utime=
/dev/fuse on /mnt/runtime/default/385F-1C17 type fuse (rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other)
/dev/fuse on /storage/385F-1C17 type fuse (rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other)
/dev/fuse on /mnt/runtime/read/385F-1C17 type fuse (rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other)
/dev/fuse on /mnt/runtime/write/385F-1C17 type fuse (rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other)
root@ms013g:/ # fsck.f2fs
Error: Device not specified

Usage: fsck.f2fs [options] device
[options]:
-a check/fix potential corruption, reported by f2fs
-d debug level [default:0]
-f check/fix entire partition
-p preen mode [default is same as -a]
-t show directory tree [-d -1]
1|root@ms013g:/ # [B][U][SIZE="5"]fsck.f2fs -a /dev/block/vold/public:179_65[/SIZE][/U][/B]
Info: Fix the reported corruption.
Info: Mounted device!
Info: Check FS only due to RO
Info: sector size = 512
Info: total sectors = 32219136 (15732 MB)
Can't find a valid F2FS superblock at 0x0
Can't find a valid F2FS superblock at 0x1
255|root@ms013g:/ # [B][U][SIZE="5"]fsck.f2fs -a /mnt/media_rw/385F-1C17[/SIZE][/U][/B]
Info: Fix the reported corruption.
Error: Failed to open the device!
255|root@ms013g:/ #

What should I do