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Bug#256302: XSI:isms in several scripts

> They seem to be allowed under POSIX and inherited from XSI, unless I'm
> misreading the URL you provided.

The "XSI" annotation means that it's an optional extension to the standard,
so a conformant shell need not support it, and therefore a portable
POSIX sh script cannot assume its presence.  In current Debian
policy, the only variance from strict extensional POSIX is the "echo -n"

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