file system time stamp resolution into account.
** New features
+ cp -pu and mv -u (when copying) now don't bother to update the
+ destination if the resulting time stamp would be no newer than the
+ preexisting time stamp. This saves work in the common case when
+ copying or moving multiple times to the same destination in a file
+ system with a coarse time stamp resolution.
+
dd has new conversions for the conv= option:
nocreat do not create the output file