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Add info on whitelisting (#5197)

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Needs to be added as causing issues for users https://community.home-assistant.io/t/0-67-whitelisted-dir-issues/50305/5
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Robin 2018-04-16 14:27:36 +01:00 committed by Alok Saboo
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source/_components/sensor.file.markdown
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@ -14,7 +14,7 @@ ha_release: 0.45
---
The `file` sensor platform reads the entries from a plain-text file and shows the found value. Only the last line of the file is used. This is similar to do `$ tail -n 1 sensor.txt` on the command-line.
The `file` sensor platform reads the entries from a plain-text file and shows the found value. Only the last line of the file is used. This is similar to do `$ tail -n 1 sensor.txt` on the command-line. Note that file paths must be added to [whitelist_external_dirs](/docs/configuration/basic/).
To enable the `file` sensor, add the following lines to your `configuration.yaml`: