wp-cli/wp-cli — pull request #535 by scribu (2013-06-20 20:57:11+00:00)
Title: Allow reading values from STDIN

Current syntax:

```
wp option set key value
```

Additional syntax:

```
wp option set key --format=json < value.json
```

I'm thinking this would also work for `wp option add` and all the `-meta` commands.