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(librep.info)User Information

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User Information
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   These functions are exported by the `rep.system' module.

 - Function: user-login-name
     This function returns a string containing the login name of the
     user.

          (user-login-name)
              => "john"

 - Function: user-full-name #!optional real-name
     This function returns a string containing the `real' name of the
     user; the format of the string will depend on the host system.

     If REAL-NAME is a string, it defines the name that will be
     returned by subsequent calls to this function.

          (user-full-name)
              => "John Harper"

 - Function: user-home-directory #!optional user
     This function returns the home directory of the user whose login
     name is USER, or the current user if USER is undefined. The
     returned string will be as returned by `file-name-as-directory'
     (i.e. terminated by a `/' character under UNIX)

          (user-home-directory)
              => "/home/john/"