Gcode touch off Z in tool table

Hi

Which command is used to save the current relative z value to the tool table?
I made a macro that goes to a reference positions, hits toolsetter and after this I have to manually click 'touch off z' in the tool table.
I would like to automate this last part. I came across G10 L10 but I have to put in a value. I want the system to use the current value and add it to the table.

i think you are after G10L2Pn or G10L20Pn.
linuxcnc.org/docs/2.6/html/gcode/gcode.html#sec:G10-L2_
linuxcnc.org/docs/2.6/html/gcode/gcode.html#sec:G10-L20

Thanks for the reply
But solved it using G10 L10 with the parameter for current tool loaded (#5300 if i'm correct) plus the z-0.