this is behaviour changed upstream:
"Changed from 3.1 to 3.2, for Posix
conformance. `echo -e' (and the corresponding xpg_echo shell option)
now conform to the POSIX standard and accept 0-3 octal digits after a
(required) leading `\0'.
The xpg_echo and `echo -e' code should be identical. There are lots of
ways to indicate that backslash escapes should be interpreted -- maybe
too many -- but when they are, they should behave consistently.
This is why portable applications should use printf. "
** Changed in: bash (Ubuntu)
Status: Confirmed => Won't Fix
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echo does not handle escapes any more
https://bugs.launchpad.net/bugs/116226
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