Unable to access the "mmcblk0p6" file, on Samsung S5300 Mini Pocket
/dev/block/mmcblk0p6 is not a real file, it is a virtual file representing a block device (that is why it's in /dev/block). 'mmcblk0p6' denotes that it's the sixth partition of the first MMC card. I am not really sure why you want to cat that file.