virtual utility的意思|示意

The created images are saved using the UWF format, which is also the only virtual disk extension recognized by the utility.

所创建的图像被使用UWF格式，这也是由实用程序识别的唯一的虚拟磁盘扩展保存。

The JPS utility lists the virtual machines for the current user on the target system.

jps工具为目标系统的当前用户列出虚拟机。

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)。