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Some shells may apply word splitting after expanding variable in
`local a=$1`. I know just about yash, but since `local` is supposed to
be a builtin *command*, the "correct" behaviour of common shells is
actually a special case for `local` - it doesn't apply for other
commands. See https://osdn.net/projects/yash/ticket/46041.
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'echo -n' and 'echo -e' are not portable, not all commonly used shells
support both of them (in the same way). 'echo -e' is not even defined
in POSIX.
https://pubs.opengroup.org/onlinepubs/009604599/utilities/echo.html:
> New applications are encouraged to use printf instead of echo.
> ...
> Conforming applications that wish to do prompting without <newline>s
> or that could possibly be expecting to echo a -n, should use the
> printf utility derived from the Ninth Edition system.
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Commit ec0c7a7 changed the sed expression for PREFIX injection but
forgot to update the scripts.
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