shell16进制hex和10进制转换
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 ...