internal command in Dos are
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1) To copy the file command.com from drive c: to drive a:
2) What is a TSR?
3) Which keys can be pressed quit without saving in DOS
4) Which command is used to get the current date only?
5) Suppose you had an incurable computer virus and decided to wipe out all the data and partitions on your hard drive and reformat. What is the order in which you must delete the partitions?