ubuntu 中 pstree 显示的进程 解释

对Linux系统正在运行的进程有些疑惑， 便用pstree命令查看。 然后在网上查找资料， 对部分进程做出一些浅解。

如下：

init-+-NetworkManager-+-dhclient// network management daemon. It attemps to keep an active network connection // available at all times.     |                `-{NetworkManager}     |-acpid //Advanced Configuration and Power Interface.新型电源管理标准.     |-atd// run jobs queued for later execution.     |-avahi-daemon---avahi-deemon// The daemon registers local IP addresses and static services using mDNS/DNS-SD and// provides tow IPC APIs for local programs to make use of the mDNS record cache the// avahi-daemon maintains.     |-bonobo-activati---{bonobo-activat}// bonobo-activation is responsible on GNOME 2.x systems for the activation// of CORBA(Common Object Request Broker Architecuture, 公共对象请求代理体系结构// ) objects.     |-chrome-+-3*[chrome]     |        |-chrome---4*[{chrome}]     |        `-23*[{chrome}]     |-chrome---2*[chrome---2*[{chrome}]]     |-clock-applet// alarm clock for your notification area.// alarm-clock-applet is an applet providing alarm clock functionality which lives within the// notification area.     |-console-kit-dae---63*[{console-kit-da}]// ConsoleKit is a framework for keeping track of the various users,// sessions, and seats present on a system. It provides a mechanism// for software to react to changes of any of these items or of any// the metadata associated with them.     |-cron// cron守护进程执行预定的命令，它会在预定的时间执行预定的命令或脚本.     |-cupsd// common unix printing system daemon.     |-2*[dbus-daemon]// Message bus daemon.// D-Bus is first a library that provides one-to-one commnication between any two applications;// dbus-daemon is an application that uses this library to implement a message bus daemon.// Multiple programs connect to the message bus daemon and can exchange messages with one another.     |-dbus-launch// Utility to start a message bus from a shell script.     |-gconfd-2//1) it's basically a "registry" for gnome apps.   -- ?//2) This daemon's primary purpose is to notify applications when a configuration value has changed. --?     |-gdm-binary-+-gdm-simple-slav-+-Xorg// GDM is the GNOME Display Manager, a program used for login// session management. GDM is a wrapper script that launching gdb-binary and// passes along any option.// gdm-binary forks an Xserver and a slave process. The main// gdm-binary process then listens to XDMCP requests from remote// displays, if so configured, and monitors the local display sessions.// Xorg 是 X11 窗口系统的一个开源实现.     |            |                 |-gdm-session-wor-+-gnome-session-+-compiz-+-sh---gtk-window-deco     // The gnome-session program starts up the GNOME desktop environment.// Compiz 是第一个由OpenGL驱动的运行于 X Window System 上的混合窗口管理器。// Compiz的混合渲染能力使其可以在窗口管理过程中实现多种视觉效果，比如在// 矩形虚拟桌面上的窗口最小化.     |            |                 |                 |               |        `-sh---gnome-terminal-+-2*[bash]     |            |                 |                 |               |                              |-bash---pstree     |            |                 |                 |               |                              |-gnome-pty-helpe     // Help setuid application.     |            |                 |                 |               |                              `-{gnome-terminal}     |            |                 |                 |               |-evolution-alarm---{evolution-alar}     |            |                 |                 |               |-gdu-notificatio     |            |                 |                 |               |-gnome-panel     |            |                 |                 |               |-gnome-power-man     |            |                 |                 |               |-ibus-daemon-+-ibus-engine-pin     |            |                 |                 |               |             |-ibus-gconf     |            |                 |                 |               |             |-python     |            |                 |                 |               |             `-{ibus-daemon}     |            |                 |                 |               |-nautilus// the gnome file manager.     |            |                 |                 |               |-nm-applet// network manager applet.     |            |                 |                 |               |-polkit-gnome-au     |            |                 |                 |               |-python     |            |                 |                 |               |-ssh-agent     |            |                 |                 |               |-update-notifier     |            |                 |                 |               `-{gnome-session}     |            |                 |                 `-{gdm-session-wo}     |            |                 `-{gdm-simple-sla}     |            `-{gdm-binary}     |-6*[getty]     |-gnome-keyring-d---3*[{gnome-keyring-}]     |-gnome-screensav     |-gnome-settings-     |-gvfs-afc-volume---{gvfs-afc-volum}// general video file server     |-gvfs-fuse-daemo---3*[{gvfs-fuse-daem}]     |-gvfs-gdu-volume     |-gvfs-gphoto2-vo     |-gvfsd     |-gvfsd-metadata     |-gvfsd-trash     |-hald-+-hald-runner-+-hald-addon-acpi// hald is a daemon that maintains a database of devices// connected to the system in real-time.     |      |             |-hald-addon-cpuf     |      |             |-hald-addon-inpu     |      |             `-hald-addon-stor     |      `-{hald}     |-ibus-x11     |-2*[indicator-apple]     |-indicator-appli     |-indicator-me-se     |-indicator-messa     |-indicator-sessi     |-indicator-sound     |-modem-manager     |-notification-ar     |-notify-osd// 屏显通知系统     |-polkitd// polkitd provides the org.freedesktop.PolicyKit1 D-Bus on the system message bus.     |-pulseaudio-+-gconf-helper     |            `-2*[{pulseaudio}]     |-rsyslogd---2*[{rsyslogd}]// reliable and extendes syslogd     |-rtkit-daemon---2*[{rtkit-daemon}]// something about PulseAudio     |-system-service-     |-trashapplet     |-udevd---2*[udevd]// Linux configurable dynamic device naming support.     |-udisks-daemon-+-udisks-daemon     |               `-{udisks-daemon}     |-upowerd// provides the org.freedesktop.UPower service on the system message bus.     |-upstart-udev-br     |-wnck-applet// GNome: wnck allows you to use the Window Navigator Construction Kit library// from perl to create things like destop switchers and taskbars.     `-wpa_supplicant// wpa_supplicant is a WPA Supplicant for Linux, BSD, Mac OS X, and Windows with // support for WPA and WPA2.