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htop - an interactive process viewer for Linux

This is htop, an interactive process viewer for Linux. It is a text-mode application (for console or X terminals) and requires ncurses. Tested with Linux 2.4 and 2.6.

官方网站：http://htop.sourceforge.net/
　　可以进行水平或竖直滚动 （总算可以看到所有进程和全部命令行了）
　　可以跟踪进程 （通过集成strace实现）
　　主页面上显示常用功能项，很方便。top里可以要'h'一下。
　　支持进程树状显示
　　可以按名称查找进程
　　支持鼠标
　　htop很不错，但还可以做得更好，下面是我想要的功能：
　　显示进程打开的文件
　　显示进程内存映射情况
　　更完整的man手册（比如设置更新周期的命令行选项'-d'就没有在手册中说明）
　　P.S. strace是个宝贝。单独做一个strace前端本身就是个不错的项目，支持对strace结果的分类，查询等功能。

[root@mx6_bak io]# man htop
htop(1)                              Utils                             htop(1)

NAME
       htop - interactive process viewer

SYNTAX
       htop

DESCRIPTION
       This program is a free (GPL) ncurses-based process viewer.

       It  is similar to top, but allows to scroll the list vertically and horizontally to see all processes and their
       full command lines.

       Tasks related to processes (killing, renicing) can be done without entering their PIDs.

COMMAND-LINE OPTIONS
       The following flags are supported:

       -d DELAY
              Delay between updates, in tenths of seconds

       -u USERNAME
              Show only processes of a given user

       --sort-key COLUMN
              Sort by this column (use --sort-key help for a column list)

INTERACTIVE COMMANDS
       The following commands are supported:

       Arrows, PgUP, PgDn, Home, End
            Scroll process list.

       Space
            "Tag": mark a process. Commands that can operate on multiple processes, like "kill", will then apply  over
            the list of tagged processes, instead of the currently highlighted one.

       U    "Untag" all processes (remove all tags added with the Space key).

       s    Trace  process  system calls: if strace(1) is installed, pressing this key will attach it to the currently
            selected process, presenting a live update of system calls issued by the process.

       l    Display open files for a process: if lsof(1) is installed, pressing this key will display the list of file
            descriptors opened by the process.

       F1, h
            Help screen

       F2, S
            Setup screen. There you can configure meters displayed on the top side of the screen, as well as set vari-
            ous display options, choose among color schemes and select the layout of the displayed columns.

       F3, /
            Incremental process search: type in part of a process command line and the  selection  highlight  will  be
            moved to it. While in search mode, pressing this key will cycle through matching occurrences.

       F4, I
            Invert sort order: if sort order is increasing, switch to decreasing, and vice-versa.

       F5, t
            Tree view: organize processes by parenthood, and layout the relations between them as a tree. Toggling the
            key will switch between tree and your previously selected sort view. Selecting a sort view will exit  tree
            view.

       F6, >
            Select field for sorting. The sort field is indicated by a highlight in the header.

       F7, ], -
            Increase  selected process priority (subtract from ’nice’ value).  This can be done by the superuser only.

       F8, [, +
            Decrease selected process priority (add to ’nice’ value)

       F9, k
            "Kill" process: sends a signal which is selected in a menu, to one or a group of processes.  If  processes
            were tagged, sends the signal to all tagged processes.  If none is tagged, sends to the currently selected
            process.

       F10, q
            Quit

       +, - When in tree view mode, expand or collapse subtree. When a subtree is collapsed a "+" sign  shows  to  the
            left of the process name.

       a (on multiprocessor machines)
            Set CPU affinity: mark which CPUs a process is allowed to use.

       u    Show only processes owned by a specified user.

       M    Sort by memory usage (top compatibility key).

       P    Sort by processor usage (top compatibility key).

       T    Sort by time (top compatibility key).

       F    "Follow"  process:  if  the sort order causes the currently selected process to move in the list, make the
            selection bar follow it. This is useful for monitoring a process: this way, you can keep a process  always
            visible on screen. When a movement key is used, "follow" loses effect.

       K    Hide  kernel  threads: prevent the threads belonging the kernel to be displayed in the process list. (This
            is a toggle key.)

       H    Hide user threads: on systems that represent them differently than  ordinary  processes  (such  as  recent
            NPTL-based systems), this can hide threads from userspace processes in the process list. (This is a toggle
            key.)

       Ctrl-L
            Refresh: redraw screen and recalculate values.

       Numbers
            PID search: type in process ID and the selection highlight will be moved to it.

AUTHORS
       htop is developed by Hisham Muhammad <loderunner@users.sourceforge.net>.
       This man page was written by Bartosz Fenski <fenio@o2.pl> for the Debian GNU/Linux distribution (but it may  be
       used by others), and updated by Hisham Muhammad.

Bartosz Fenski <fenio@o2.pl>          0.9                              htop(1)

Ex：

Using htop do the following.

htop
F5 (Tree view)
F2 (Setup)
Select columns
Select RBYTES WBYTES
F10 (Done)

And there you go, per process disk I/O, in real time.