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According to Rich Felker on 11/26/2007 8:51 PM:
> POSIX leaves behavior unspecified when -n is the first argument, and
> also when any argument contains backslashes. However, if conformance
> to the XSI part of SUSv3 is also desired, -e must be default
When running in POSIX/sh mode, bash should either disable the echo
builtin or stop giving special treatment to -e and -E. In particular,
POSIX provides well-defined behavior for:
echo -e
bash gives: blank line
posix gives: line containing only "-e"
echo -E
bash gives: blank line
posix gives: line
