Command: nice /time

• nice
  • nice number represent to the the priority of program
  • can be changed using nice -n to change priority
  • larger the n, less the priority
  • -20 =< n =< 20
• time
  • elapsed real  time
    • total time
  • system time(usually very fast)
    • system hold input
  • user time
    • time need to run program