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Joffrey F 513dfda218 Allow dashes in environment variable names
See http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html
Environment variable names used by the utilities in the Shell and
Utilities volume of POSIX.1-2008 consist solely of uppercase letters,
digits, and the <underscore> ( '_' ) from the characters defined in
Portable Character Set and do not begin with a digit. Other characters may
be permitted by an implementation; applications shall tolerate the
presence of such names.

Signed-off-by: Joffrey F <joffrey@docker.com>
2015-11-11 12:45:02 -08:00
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2015-08-05 15:50:22 +01:00