Examlex
Which of the following kinds of UPS always runs off a battery?
Echo
A command in various operating systems that displays messages or turns command echoing on or off in programming environments.
Commands
Instructions given by a user or a program to an operating system or software to perform a specific task.
Environment Variable
A variable that describes the environment in which a program runs. It contains a name and a value, where the value is the path to the program identified by the variable name.
Program
A set of instructions that a computer uses to perform a specific task or operation.
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