To run crontab jobs one must remount the rootfs writeable:
$ sudo mount -o remount,rw /$ crontab -e$ sudo mount -o remount,ro /
With this I installed a cron job for user 'phablet' which saves every five minutes the current list of all processes to catch this run away / battery drain problem
$ sudo crontab -e -u phablet00,05,10,15,20,25,30,35,40,45,50,55 * * * * /home/phablet/mon1.sh
$ cat mon1.sh#!/bin/shprintf "\n\n" >> /home/phablet/mon.outdate >> /home/phablet/mon.outprintf "battery capacity%%: " >> /home/phablet/mon.outcat /sys/devices/platform/battery/power_supply/battery/capacity >> /home/phablet/mon.outprintf "battery temp : " >> /home/phablet/mon.outcat /sys/devices/platform/battery/power_supply/battery/temp >> /home/phablet/mon.outtop -b -n1 -o %CPU | head -n 20 >> /home/phablet/mon.out
Last updated: Sun Nov 1 10:12:25 CET 2015