使用bc 可以進行不同進制之間的轉換

digit=100;

printf "the number is : %d\n" $digit;
binary=$( echo "obase=2;$digit" | bc );
printf "result is : %s\n" $binary;
digit1=$( echo "obase=10;ibase=2;$binary" | bc );
printf "binary is : %d\n" $digit1;