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tty is a Unix command that prints on standard output file name connected to standard input. The program's name comes from teletypewriter, abbreviated "TTY".

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How to turn off the backlight of the screen when the lid of my laptop is closed?

I want to use an old laptop(Dell E5420) as a CentOS7 server in my home, so it is not required at all to operate it on the console, and certainly there is no X-server or other GUI on it. When it is ru …
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