4/2/2020 print non-printable ASCII chars

Just use commands producing dumps :

use either od,

echo -n "$IFS" | od -t x1
0000000 20 09 0a
0000003

or simply xxd

echo -n "$IFS" | xxd -u -c1
00000000: 20
00000001: 09 . 
00000002: 0A .