[Solved] cut out string from command line via shellSwitch

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I need help to cut out a part of a string to know wich state a device has.

this is the echo from command line:

'POWER': 'On':

i will cut out the On
so that the switch shows the state of the device.
thanks

Do you have a logfile?
You can use this command to display On or Off or any other word after ‘POWER’:
cat /home/pi/power.log | awk {'print $2'} | sed "s/'//g"

Have created a logfile with your above echo and get this output

Now here’s the output if I change the logfile / your echo to ‘POWER’: ‘Off’

I made a shellsensor device. Maybe you can work with this?
The Interval can be set to your needs.

    {
      "id": "powerontest",
      "name": "Power Test Device",
      "class": "ShellSensor",
      "attributeName": "status",
      "attributeType": "string",
      "command": "cat /home/pi/power.log | awk {'print $2'} | sed \"s/'//g\"",
      "interval": 10000
    },

Thanks, will test it tomorrow.

Ah OK - stupid me !!
Forgot a very important line of code at the device.

I updated the above device. Now you can use it within rules as follows :
IF $powerontest.status = "On" THEN do some stuff
Or vice versa
IF $powerontest.status = "Off" THEN do some stuff

sry, the string i get is this one: {'MAIN:PWR': 'Standby'}
, when i execute this command in the command line:

sudo /root/programme/yamaha/yamaha.py PWR ? | awk {'print $2'} | sed "s/}//g" | sed "s/'//g"

i get this if the receiver is Off

Standby

and this when it is On

On

now i will use a shell switch like this one.

    {
      "id": "yamahapower",
      "name": "Yamaha AVR",
      "class": "ShellSwitch",
      "onCommand": "sudo /root/programme/yamaha/yamaha.py PWR On",
      "offCommand": "sudo /root/programme/yamaha/yamaha.py PWR Standby",
      "getStateCommand": "sudo /root/programme/yamaha/yamaha.py PWR ? | awk {'print $2'} | sed "s/}//g" | sed "s/'//g"",
      "interval": 10000
    },

but when i try to start pimatic with that, i get the following error

17:01:04.922 [pimatic] error: Startup error: Error: Parse error on line 398:
17:01:04.922 [pimatic] error:>...{'print $2'} | sed ""s/"} 
17:01:04.922 [pimatic] error:>-----------------------^
17:09:59.819 [pimatic] error:>Expecting 'EOF', '}', ':', ',', ']', got 'STRING'
17:09:59.819 [pimatic] error:>    at Object.parseError (/root/pimatic-app/node_modules/pimatic/node_modules/cjson/node_modules/jsonlint/lib/jsonlint.js:55:11)
17:09:59.819 [pimatic] error:>    at Object.parse (/root/pimatic-app/node_modules/pimatic/node_modules/cjson/node_modules/jsonlint/lib/jsonlint.js:132:22)
17:09:59.819 [pimatic] error:>    at Object.exports.parse (/root/pimatic-app/node_modules/pimatic/node_modules/cjson/node_modules/jsonlint/lib/jsonlint.js:417:53)
17:09:59.819 [pimatic] error:>    at Object.exports.parse (/root/pimatic-app/node_modules/pimatic/node_modules/cjson/index.js:88:28)
17:09:59.819 [pimatic] error:>    at Framework._loadConfig (/root/pimatic-app/node_modules/pimatic/lib/framework.coffee:98:24)
17:09:59.819 [pimatic] error:>    at new Framework (/root/pimatic-app/node_modules/pimatic/lib/framework.coffee:56:8)
17:09:59.819 [pimatic] error:>    at /root/pimatic-app/node_modules/pimatic/startup.coffee:48:21
17:09:59.819 [pimatic] error:>    at tryCatcher (/root/pimatic-app/node_modules/pimatic/node_modules/bluebird/js/main/util.js:24:31)
17:09:59.819 [pimatic] error:>    at Function.Promise.attempt.Promise.try (/root/pimatic-app/node_modules/pimatic/node_modules/bluebird/js/main/method.js:31:24)
17:09:59.819 [pimatic] error:>    at Object.module.exports.startup (/root/pimatic-app/node_modules/pimatic/startup.coffee:47:10)
17:09:59.819 [pimatic] error:>    at run (/root/pimatic-app/node_modules/pimatic/pimatic.js:15:24)
17:09:59.819 [pimatic] error:>    at /root/pimatic-app/node_modules/pimatic/lib/daemon.coffee:87:9
17:09:59.819 [pimatic] error:>    at Object.oncomplete (fs.js:107:15)
17:09:59.824 [pimatic] info: exiting...

the on and off command are working, but i cant get the state
and i thing i have to convert the standby string to off so that the switch turn off when i turn the receiver off with my normal remote.

You need to escape the " characters as follows \"

You can replace standby with off if you use sed too. Will have a look at it.

with this:

sudo /root/programme/yamaha/yamaha.py PWR ? | awk {'print $2'} | sed 's/}//g' | sed "s/'//g" | sed 's/Standby/off/' | sed 's/On/on/'

i got off
but when i remote the last doubble quotes with a single i dont get an output

and with this:

sed \"s/'//g\"

i get no output

and with this:

sudo /root/programme/yamaha/yamaha.py PWR ? | awk {'print $2'} | sed \"s/}//g\" | sed \"s/'//g\" | sed \"s/Standby/off/\" | sed \"s/On/on/\"

i got this in pimatic

17:50:06.849 [pimatic-shell-execute] error: 
17:50:07.031 [pimatic] warn: Could not update variable yamahapower.state: ShellSwitch: unknown state=""!

Hm… There must be a way to get this working

got it, with this command it works:

sudo /root/programme/yamaha/yamaha.py PWR ? | awk {'print $2'} | sed \"s/'//g\" | sed \"s/}//g\" | sed s/On/on/ | sed s/Standby/off/

Perfect! Regex, awk and sed are always tricky