Re: How to convert <binaryGlowMixedWithASCII> to pure ASCII

Kaz Kylheku wrote:

The -n option of echo is documented in POSIX (as an XSI extension),

You have that backwards.  POSIX allows -n to affect the behaviour
of echo on non-XSI systems (in an implementation-defined manner).
On XSI systems, "echo -n a" is required to output "-n a".

whereas $'...' is a feature of some shells. (Korn, Bash, Zsh?)

As others have pointed out, $'...' has been added to POSIX (in the
2024 revision), but without \u and \U.  The rationale explains that
they were omitted because their behaviour differs between shells.

--
Geoff Clare <netnews@gclare.org.uk>