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comment How do I lock the desktop screen via command line?
Sorry for my English... DISPLAY is a variable and define in which display an X Window System program renders to (it can be another monitor). In TTY this variable is empty. By default, first display is ":0.0". So use DISPLAY=:x before your command, indicates in which display run the command. And use DISPLAY=:0 or DISPLAY=:0.0 indicates: run the program in the first display.
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answered How do I lock the desktop screen via command line?