[Wlug] inconsistent results with du and multiple arguments

[Brett Russ]

Can anyone explain why du (which advertises the ability to evaluate N
file/dir arguments) seems to only be accurate for the first provided
argument?  See the following:

brett at spider:/> sudo du -smxc tmp
60      tmp
60      total
brett at spider:/> sudo du -smxc tmp bin
60      tmp
1       bin
60      total
brett at spider:/> sudo du -smxc bin
9       bin
9       total
brett at spider:/> sudo du -smxc bin tmp
9       bin
1       tmp
9       total
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