用octal digit造句子，“octal digit”造句

2、Note: a numeric file mode is a octal digit from 0 to 7, or a three-bit number, one bit for each of read, write, and execute.

1、It is represented symbolically by t and numerically as a 1 in the high-order octal digit.

3、a positional system of numeration that uses octal digits and a radix of 8.

4、Permissions set in this way use up to four octal digits.