From The DOS 5 manual (copyright Microsoft Corporation/Baker Publishing/Dragon/Sun Software)

Online Help With Commands
MS-DOS version 5.0 includes online Help for MS-DOS commands. To get Help with the syntax,parameters, and switches of any MS-DOS command, type the command name followed by  /? on the command line or type help followed by the command name. For example, for Help information about the copy command, type the following:
      copy  /?
      help copy


MS-DOS displays information about the command, syntax, parameters, and switches.
To see a list of all MS-DOS commands and a brief description of the purpose of each command, type help with no parameters or switches.


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online help
http://en.wikipedia.org/wiki/List_of_DOS_commands
 
 

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