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Turn On/Off Keyboard LEDs via commandline

Terminal - Turn On/Off Keyboard LEDs via commandline
xset led 3
2009-10-23 00:25:56
User: m33600
Turn On/Off Keyboard LEDs via commandline

Usefull as a light blink to remember events, mails, intrusions, etc... yet another output

Since nobody ever uses the scroll lock function...

Usefull to interface a linux system with some hardware, for example, opto interfacing the keyboard led to a relay to remotely reset, etc. ( a simple LDR glued over the LED will do the trick )

xset led 3 turns on the third led, ie, Scroll lock

xset -led 3 turns it off

xset led 1 turns on Numerical Lock led ( doesn t work on all computer )

xset led 2 turns on Caps Lock led ( idem )

Using it as a reset watchdog, the relay expected light pulses. Shall the computer hangs, the relay releases and reset the machine ( discharge of a capacitor ) ;-)


There are 4 alternatives - vote for the best!

Terminal - Alternatives

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What others think


Comment by DaveQB 286 weeks and 2 days ago

Any CLI ascii to morse translators around?

Comment by rbossy 285 weeks and 4 days ago

this is what I call an idea!!!

Comment by m33600 285 weeks and 3 days ago

Try this:


(it's in the AUR if you have Arch Linux)

Comment by matthewbauer 284 weeks and 5 days ago

I found that setleds worked better.


setleds +num < /dev/tty7
Comment by matthewbauer 284 weeks and 4 days ago

Happy Xmes!

while true; do setleds -D -num < /dev/tty7; sleep 3; setleds -D +num < /dev/tty; done

Comment by Heoa 277 weeks and 4 days ago


while true; do setleds -D -num < /dev/tty7; sleep 3; setleds -D +num < /dev/tty; sleep 3; done

Comment by Heoa 277 weeks and 4 days ago

Your point of view

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