simple command to show changes made in a revision

can anyone tell me what is a simple command to show the last 3-4
revisions (like 4 digit number)?
I looked at several command sheets that had been put together but have
not seen anything.

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What is a simple command to show all the changed files in a revision 
number ?
like suppose I just checked in some file and it returns a revision 
number of 7456
but then I want to go back and see all files (just the file name) that 
changed in
revision 7400.
thanks
Jake
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