Add dry-run for commands that can act recursively

[D.s.robertson]

I would like to suggest that a --dry-run option is added to chmod and chown so 
that when using them recursively it is easy to check what will be affected and 
avoid mistakes such overlooking a change of working directory which happens 
with the su command.
At present I can't see a way to do this, or if it is possible then perhaps the 
documentation could make it a bit clearer?

David


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