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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>