# shell16进制hex和10进制转换
Date: 2019-06-14


# 方法：

## 1  bc命令

\[root@centosgpt ~\]# echo "ibase=16; FF" |bc 255

## 2.  bash

\[root@centosgpt ~\]# echo $((0xFF)) 255

## 3.  printf

\[root@centosgpt ~\]# printf "%d\\n" 0xFF 255

## 4\. dc

\[root@centosgpt ~\]# dc -e '16i FF p' 255

# 限制：

其中bc，dc 可以不受整数位数限制  如：64-bit integer limit of 2^64， 当大于64位时验证下各个脚本的处理结果

## 1 bc

\[root@centosgpt ~\]# echo "ibase=16; 7FFFFFFFFFFFFFFFF" |bc 147573952589676412927

## 2 echo

\[root@centosgpt ~\]# echo $((0x7FFFFFFFFFFFFFFFF)) -1

## 3\. printf

\[root@centosgpt ~\]# printf "%ld\\n" 0x7FFFFFFFFFFFFFFFF -bash: printf: warning: 0x7FFFFFFFFFFFFFFFF: Numerical result out of range 9223372036854775807

## 4\. dc

\[root@centosgpt ~\]# dc -e '16i 7FFFFFFFFFFFFFFFF p' 147573952589676412927

# 参考：

[hexadecimal-to-decimal-in-shell-script](https://stackoverflow.com/questions/13280131/hexadecimal-to-decimal-in-shell-script)