ubuntu@ubuntu:~$ sudo /dev/mmcblk0
sudo: /dev/mmcblk0: command not found
ubuntu@ubuntu:~$ sudo parted /dev/mmcblk0
GNU Parted 2.3
Using /dev/mmcblk0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print                                                            
Model: SD 00000 (sd/mmc)
Disk /dev/mmcblk0: 7861MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type      File system  Flags
 1      4194kB  1542MB  1538MB  primary   fat32        lba
 2      1544MB  7828MB  6284MB  extended
 5      1548MB  1611MB  62.9MB  logical   fat32        lba
 6      1615MB  7828MB  6213MB  logical   ext4
 3      7828MB  7861MB  33.6MB  primary   ext4