Command: which
  WHICH searches and displays the executable file for each
  specified command.
Syntax:
  which command [/?]
Options:
  command  The command to be found.
  /?       Shows the help.
Comments:
  WHICH is a utility born in the UNIX world that enables users to find
  executable files in directories listed in the PATH environment variable.
  WHICH is a command internal to command.com and needs no other file
  in order to work.
Examples:
  which xcopy  searches the executable for the xcopy command. 
               The output is: "xcopy   C:\FDOS\BIN\xcopy.exe"
  which copy   The output is: "copy"   (copy is a command.com command)
See also:
  - nowhere -
  Copyright © 2008 W. Spiegl, updated in 2020.
  This file is derived from the FreeDOS Spec Command HOWTO.
  See the file H2Cpying for copying conditions.