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Fix binary_sensor.command_line example (#1501)

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The example to check if an IP is alive didn't work. It seems that the `&> /dev/null` redirector didn't work. `> /dev/null 2>&1` works fine however.

This can be verified with the following config:
```yaml
- platform: command_line
  name: "testtrue1"
  command: "true &> /dev/null && echo success || echo fail"
  scan_interval: 5
  payload_on: "success"
  payload_off: "fail"

- platform: command_line
  name: "testfalse1"
  command: "false &> /dev/null && echo success || echo fail"
  scan_interval: 5
  payload_on: "success"
  payload_off: "fail"

- platform: command_line
  name: "testtrue2"
  command: "true > /dev/null 2>&1 && echo success || echo fail"
  scan_interval: 5
  payload_on: "success"
  payload_off: "fail"

- platform: command_line
  name: "testfalse2"
  command: "false > /dev/null 2>&1 && echo success || echo fail"
  scan_interval: 5
  payload_on: "success"
  payload_off: "fail"
```

Also a `-W 1` lowers the timeout to one second.
This commit is contained in:
Michaël Arnauts 2016-11-28 21:42:24 +01:00 committed by Fabian Affolter
parent a1e65601b6
commit d33fbaef7d
1 changed files with 1 additions and 1 deletions
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2
source/_components/binary_sensor.command_line.markdown
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@ -73,7 +73,7 @@ An alternative solution could look like this:
binary_sensor:
platform: command_line
name: Printer
command: ping -c 1 192.168.1.10 &> /dev/null && echo success || echo fail
command: ping -W 1 -c 1 192.168.1.10 > /dev/null 2>&1 && echo success || echo fail
sensor_class: connectivity
payload_on: "success"
payload_off: "fail"