cat /sys/block/mmcblk0/../../cid
因為 /sys 這個 node 是 ln，所以用 ../../
ref: http://stackoverflow.com/questions/3348643/how-to-read-the-sd-card-id-number
ubuntu 在 R40e 上 還有 Debian 在 Sempron 2600 上
2012年6月22日 星期五
SD card 的 cid
在 /sys 裡：
因為 /sys 這個 node 是 ln，所以用 ../../
ref: http://stackoverflow.com/questions/3348643/how-to-read-the-sd-card-id-number
因為 /sys 這個 node 是 ln，所以用 ../../
ref: http://stackoverflow.com/questions/3348643/how-to-read-the-sd-card-id-number
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