What's the hex for?

Question

I know 0D 0A means new line,What's 09 09 09 09 09 09 09 3F ?

It's from UTF-8.

Answer 1

an Operating system can use three different kind of numeric bases in order to encode characters. Binary, decimal or hexadecimal encoding. Most of the times the encoding is done using an iso table code ASCII table which for every computer usable characters, defines a binary, decimal and hexadecimal value who would represent it as a number.

You should take a look to man ascii then ;)

Answer 2

0x09 = 'Horizontal Tab'
0x3F = '?'

From here.

Answer 3

According to this ascii table that is 7 tabs followed by a question mark.

Answer 4

09 is TAB
3F is ?

So you have 2 newlines, 7 tabs, a question mark and another newline.

Assuming its ASCII.