Current Sort Field: P for window 1:Def
Select sort field via field letter, type any other key to return
a: PID = Process Id v: nDRT = Dirty Pages count
d: UID = User Id y: WCHAN = Sleeping in Function
e: USER = User Name z: Flags = Task Flags
........
如果只想显示某个特定用户的进程，可以使用-u选项
$ top -u oracle
更多示例：
htop
A strong tool similart to top
pstree
yum install psmisc -y
pstree
pstree -up #show all tree
