bash: how do I write non ascii chars using echo?

Is there an escape sequence, such as \012 or something like that?

I want to append on ascii chars to a file using echo ?? >> file

From stackoverflow

• Use

  echo -e "\012"
  

• Duplicate of this question.

  vartec : Well, not exactly, this 7-bit ASCII control code '\n', not unicode.

• In the DOS command line enter EDIT, then to insert control characters use CTRL+P followed by the control character required.

  For example

  echo Ctrl-P ALT+013 > file
  

• If you care about portability, you'll drop echo and use printf(1):

  printf '\012'