pxl calls xlock periodically, at a fixed interval.
It is a shell script.
xlock or xlockmore is required.
pxl starts with a shebang.
pxl has only one parameter, which is required. The -t parameter is measured in secods. This is the interval that xlock is called
pxl loops indefinitely. It locks the screen every t seconds.
When a password is input to unlock the screen, the timing of t seconds restart.
Put shebang, readparameter, and loop together. Tangle it to ../pxl.
../pxl needs to be executable. The code below is executed, when this org document is exported, which sets ../pxl to be executable.
chmod +x ../pxl