ps - report a snapshot of current processes
top - display tasks
job - list active jobs
bg - place a job in the background
fg - place a job in the foreground
kill - send a signal to a process
killall - kill processes by name
shutdown - showdown or reboot the system
【原】The Linux Command Line - Processes
原文：http://www.cnblogs.com/ybluo/p/7223327.html