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14

What is the "yes" command?

rated 0 times [ 14] [ 0] / answers: 1 / hits: 45296 / 2 Years ago, fri, july 8, 2022, 9:14:59

I issued a command in the Ubuntu terminal that required me to type yes but I discovered that it only asks me the first time, but I had already pressed enter before I realized. So I expected a "command not found" message but instead I got a never-ending stream of "y"s. This seems to be the only thing this does, so I'm wondering what the point of this command is and why it outputs "y"s? (Ubuntu 11.10)

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istmasted

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answered 2 Years ago looweets · Accepted Answer

From wikipedia:

By itself, the yes command outputs 'y' or whatever is specified as an argument, followed by a newline repeatedly until stopped by the user or otherwise killed; when piped into a command, it will continue until the pipe breaks (i.e., the program completes its execution).

It can also be used to test how well a system handles high loads, as using yes results in 100% processor usage, for systems with a single processor (for a multiprocessor system, a process must be run for each processor). This, for example, can be useful for investigating whether a system's cooling system will be effective when the processor is running at 100%.