pstree 树形显示进程列表

# pstree
init-+-acpid
     |-atd
     |-crond
     |-cups-config-dae
     |-cupsd
     |-dbus-daemon-1
     |-dhclient
     |-events/0-+-aio/0
     |          |-kacpid
     |          |-kauditd
     |          |-kblockd/0
     |          |-khelper
     |          |-kmirrord
     |          `-2*[pdflush]
     |-gpm
     |-hald
     |-khubd
     |-2*[kjournald]
     |-klogd
     |-kseriod
     |-ksoftirqd/0
     |-kswapd0
     |-login---bash
     |-5*[mingetty]
     |-portmap
     |-rpc.idmapd
     |-rpc.statd
     |-2*[sendmail]
     |-smartd
     |-sshd---sshd---bash---pstree
     |-syslogd
     |-udevd
     |-vsftpd
     |-xfs
     `-xinetd

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