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- Avoid obsolescent forms of test builtin (`-a` and `-o`; see APPLICATION USAGE section of http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html). - Quote all expansions to prevent string-splitting and globbing. - Avoid unspecified "exit -1" (only single-byte integers are valid); instead, use identical exit status to shell command-not-found. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Charles Duffy <chaduffy@cisco.com> Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19695 6f19259b-4bc3-4df7-8a09-765794883524