SHELL中数值进制转换

八进制（020）→10

[root@localhostyemo]#echo$((num=020))
16
[root@localhostyemo]#echo$((num=8#20))
16

十六进制（0xff）→10

[root@localhostyemo]#echo$((num=0xff))
255
[root@localhostyemo]#echo$((num=16#ff))
255
[root@localhostyemo]#echo$((num=2#1111111))
127
[root@localhostyemo]#echo$((num=2#11111111))
255

十进制→其他

[root@localhostyemo]#echo"obase=2;338"|bc
101010010
[root@localhostyemo]#echo"obase=8;338"|bc
522
[root@localhostyemo]#echo"obase=16;338"|bc
152