       nice ?priorityincr?

              Change  or return the process priority.  If priori
              tyincr  is  omitted,  the   current   priority   is
              returned.  If priorityincr is positive, it is added
              to the current  priority  level,  up  to  a  system
              defined maximum (normally 19),

              Negative  priorityincr values cumulatively increase
              the program's priority down  to  a  system  defined
              minimum  (normally  -19);  increasing priority with
              negative niceness values will  only  work  for  the
              superuser.

              The new priority is returned.

              The nice command is not available on Windows 95/NT.
