When the code sends you messages you see in the spare Xterminal while browsing various pages, you get important feedback that facilitates and enhances your knowledge of the system.
For instance, on Mac OS X, the wall utility — short for "write all," because it writes a message to every physical or virtual terminal device — is setgid tty (as shown above).
例如,在Mac OS X中,wall工具(“write all”的缩写,因其会将某个消息写入所有物理或虚拟终端设备而得名)的setgid被设为tty(如上所示)。
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Popular formats are PNG, PDF, and jpeg, and they can then be presented either on the fly or directly to an Xterminal, Web page, or a general graphic viewer utility.