In which version of DOS. CHKDSK command has been changed to SCANDISK?

In which version of DOS. CHKDSK command has been changed to SCANDISK?

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1) We need system files to run

2) Which command is used to display the subdirectory structure of the currently logged drive and pause the screen display after each screenful of information?

3) Which DOS command will configure a serial printing port?

4) While working with MS-DOS which key is used to get the p[revious command used:

5) Generally, the DATE is entered in the form