shell 中一个进制转换的小技巧

root@fetmx6ull-s:~# echo $(( 2#0000101 ))
5
root@fetmx6ull-s:~# echo $(( 8#0000101 ))
65
root@fetmx6ull-s:~# echo $(( 10#0000101 ))
101
root@fetmx6ull-s:~# echo $(( 16#0000101 ))
257
root@fetmx6ull-s:~#