[Solved] Read value from shell in Rule

---

Hi,

is it possible to readout a value with a shell command in a rule like this:

IF auslesen is pressed THEN set $value = (execute "wc -l /tmp/apache.log | cut -d/ -f1")

I can’t use a shellsensor because the logfile is generated with the first log entry, but it is not guaranteed that the file is all the time availible, especially after a reboot of the pi.

Regards daice

what about using the logreader device?
it will automatically update when the log changes.
maybe it’s worth a try.

Or use the Command with a shellsensor. Tue Echo from the command will shown in the GUI.

But what will happen when the file is not there? I don’t want to get to much error messages over days.
I want to count the lines in a logfile if the file exists. So i think the logreader is not the right one for this.

@daice How about doing a ‘tail -f’ of the log file piping it to wc -l for number of lines and then redirecting the output of the result to a new file which you get pimatic to monitor…

something like:-

tail -f /var/log/mylogfile | wc -l > /var/log/mynewlogfile

with mylogfile being your original log and mynewlogfile being the one you’d get pimatic monitoring

Thanks @postmanprat,

is solved with your help. Do u know if it is possible to write the value i get back in a defined line with a command like this:
wc -l apache.log | awk ‘{ print $1 }’ > /tmp/lines.log
I would like to wirite more than one number in lines.log