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svn:author
V 7
rgrimes
K 8
svn:date
V 27
2018-04-13T03:47:41.681363Z
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svn:log
V 201
MFC: r332075

Exit with usage when extra arguments are on command line
preventing mistakes such as "halt 0p" for "halt -p".
Approved by:	bde (mentor, implicit), phk (mentor,implicit)
MFC after:	1 week

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