Android "insufficient permissions for device "

當使用USB連接到device的時候，出現了"insufficient permissions for device
", 下面是我的做法:
$ sudo -s
$ ./adb kill-server
$ ./adb start-server

接下來就可成功連接到device了

檔案分割與合併

分割
split -b size file_name prefix.
split -b 1m phrase.db phrase.

合併
cat prefix.a* > file_name
cat phrase.a* > phrase.db