nice

nice – Set the priority of a command or job

       nice [OPTION] [COMMAND [ARG]...]

       Run  COMMAND  with an adjusted niceness, which affects process schedul-
       ing.  With no COMMAND, print the current  niceness.   Nicenesses  range
       from -20 (most favorable scheduling) to 19 (least favorable).

       -n, --adjustment=N
              add integer N to the niceness (default 10)

       --help display this help and exit

       --version
              output version information and exit

       NOTE: your shell may have its own version of nice, which usually super-
       sedes the version described here.  Please refer to your  shell's  docu-
       mentation for details about the options it supports.