Stdin

It's common that you will want to pass some input into dasel to work with.

The simplest way of doing so is sending it to stdin, e.g.

echo '{"message": "Hello world"}' | dasel -i json

This data could be in many formats (json, yaml, etc), so it's important that you use -i, --input to specify the input file format.

Note that if you provide an input format, you must write to stdin other dasel will hang waiting for input.

Outputting the root document with --root

By default, dasel outputs the result of the final selector. This is useful when searching for data, but not so useful when performing modifications.

$ echo '{
  "foo": {
    "bar": "baz"
  }
}' | dasel -i json 'foo.bar'
"baz"

$ echo '{
  "foo": {
    "bar": "baz"
  }
}' | dasel -i json 'foo.bar = "bong"'
"bong"

$ echo '{
  "foo": {
    "bar": "baz"
  }
}' | dasel -i json --root 'foo.bar = "bong"'
{
    "foo": {
        "bar": "bong"
    }
}