nice (from the GNU
shellutils package) to set a
command's nice value when starting.
top can renice a process. A nice
value of 19 represents the slowest (lowest priority) process; negative values
are "not-nice", with -20 being a very fast (high priority) process.
Only the superuser can set negative nice values.
# nice -19 top # very nice
# nice --20 cdrecord -v -eject speed=2 dev=0,0 disk.img # very fast
Sometimes an extreme nice value does more harm than good to the system. Use
this command carefully.