八进制（020）→10
[root@localhost yemo]# echo $((num=020)) 16 [root@localhost yemo]# echo $((num=8#20)) 16
十六进制（0xff）→10
[root@localhost yemo]# echo $((num=0xff)) 255 [root@localhost yemo]# echo $((num=16#ff)) 255 [root@localhost yemo]# echo $((num=2#1111111)) 127 [root@localhost yemo]# echo $((num=2#11111111)) 255
十进制→其他
[root@localhost yemo]# echo "obase=2;338"|bc 101010010 [root@localhost yemo]# echo "obase=8;338"|bc 522 [root@localhost yemo]# echo "obase=16;338"|bc 152
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原文：http://12550795.blog.51cto.com/12540795/1958364