[Bug 10231] /bin/sh not handling some environment variable

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=10231

--- Comment #3 from Ron Yorston <rmy at pobox.com> ---
Environment variables are defined here:

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08

Environment variable names can contain pretty much anything apart from '='.

However, shell variable ('parameter') names are much more restricted.  Section
2.3.2 of this document covers parameter expansion:

http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html

and points to the definition of an 'XBD Name':

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_235

where an 'XBD Name' is defined as:

In the shell command language, a word consisting solely of underscores, digits,
and alphabetics from the portable character set. The first character of a name
is not a digit.

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