Turn monitor on or off if off or on, respectively

xset -display :0 q | grep ' Monitor is On' > /dev/null && xset -display :0 dpms force off || xset -display :0 dpms force on
Queries whether the monitor is on according to DPMS. If true then turns the monitor off, if false turns it on. The -display option on xset means the command will work from sessions other than the console, such as ssh or a cron'd script. Command should display any errors if there are any problems (eg no X available), otherwise no output if successful.

0
2015-04-06 19:04:04

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