Disk Management
df
List disks, size, used and available space
df -h|--human-readable
List disks, size, used and available space in a human readable format
du
List current directory, subdirectories and file sizes
du /foo/bar
List specified directory, subdirectories and file sizes
du -h|--human-readable
List current directory, subdirectories and file sizes in a human readable format
du -d|--max-depth
List current directory, subdirectories and file sizes within the max depth
du -d 0
List current directory size