. Make a new copy of mars.txt called marsx. What happens if you give the following commands when the files bio and marsx both already exist? Don't guess, try it!
a) cp bio marsx
b) mv bio marsx
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marsx file will be overwritten by bio file in both the cases.
bio file will be removed if you use "mv" command instead of "cp"
Use -i interactive mode if you want to make sure if you want to overwrite.