Wake-on-lan (WOL) bash script on router running dd-wrt

After setting up my router to run dd-wrt I’ve used PuTTy to ssh into the router to start my desktop machine to work on it through a RDP session.

After spending months looking up the correct MAC address in my phone and typing the commands by hand I finally took a bit of time to write a small bash script on the router so that I could simply run the script each time I needed it.

On my router (WRT54GL) there’s a bit of space in the /jffs folder that’s usable for storing scripts.

To write a script named “wol” go to the correct directory and type:

vi wol

VI opens in command mode. To start editing press the INSERT key. At the bottom left of the screen a “I” will be displayed. The editor is now in editing mode. I just wrote:

#!/bin/ash

echo “Waking up 19\” system”

/usr/sbin/wol -i 192.168.100.255 -p 9 xx:xx:xx:xx:xx:xx

echo “Done”

Where xx:xx:xx:xx:xx:xx is the MAC address of my network card.

To get back in command mode press ESCAPE.

Then to save the file and exit type:

:wq and ENTER. (the semicolon starts the command, wq stands for write and quit).

This creates the script, the only thing left is to make is executable:

chmod 700 wol

From now on, the script can be started by going to the correct directory and typing:

./wol

The script will be called and run the commands. If there are any error messages they will be displayed.

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