Linux shell different binary data conversion (binary, octal, hexadecimal, base64)

Hexadecimal to decimal:

[chengmo@centos5 ~]$ ((num =0123));[chengmo@centos5 ~]$ echo $num;83

[chengmo@centos5 ~]$ ((num=8#123));[chengmo@centos5 ~]$ echo $num ; 83

((expression)), (()) can be any data expression. If you add in the previous: & rdquo; $ & rdquo; you can read the calculation results.

Hexadecimal to decimal:

[chengmo@centos5 ~]$ ((num=0xff)); [chengmo@centos5 ~]$ echo $num; 255[chengmo@centos5 ~]$ ((num=16#ff));[chengmo@centos5 ~]$ echo $num; 255

base-32 to decimal:

[chengmo@centos5 ~]$ ((num=32#ffff));[chengmo@centos5 ~]$ echo $num; 507375

base64 to decimal:

[chengmo@centos5 ~]$ ((num=64 #abc_)); [chengmo@centos5 ~]$ echo $num; 2667327

Binary to Decimal

[chengmo@centos5 ~]$ ((num=2#11111111)); [ ,null,null,3],Chengmo@centos5 ~]$ echo $num;255

decimal to octal

This is used to: bc external command completion. The bc command format is converted to: echo "obase=ade; value"