Select

Description

This command allows you to select data from data structures.

It will not modify the source data in any way.

Usage

dasel select -f <file> <selector>

Flags

Flag	Description
-f, --file	Specify the file to query. This is required unless you are piping in data. If piping in data you can optionally pass -f stdin/-f -.
-r, --read	Specify the parser to use when reading the input data. This is required if you are piping in data, otherwise dasel will use the given file extension to guess which parser to use. See supported file types.
-w, --write	Specify the parser to use when writing the output data. If not provided dasel will attempt to use the--read flag to determine which parser to use. See supported file types.
-p, --parser	Shorthand for -r <value> -w <value>
-m, --multiple	Tells dasel to select multiple items. See multiple.
-s, --selector, <selector>	Specify the selector to use. See selectors for more information. If no selector flag is given, dasel assumes the first argument given is the selector. This is required.
--plain	By default, dasel formats the output using the specified parser. If this flag is used no formatting occurs and the results output as a string.
-n, --null	Output null instead of ValueNotFound errors. See null.
-c, --compact	This tells dasel to output compact data where possible. E.g. not pretty printing JSON.
--length	This tells dasel to output the length of the value found. [1, 2, 3] - 3: The number of elements within the array. {"a": 1, "b": 2} - 2: The number of elements within the map. "Hello there" - 11: The number of characters in the string. Any other values are converted to strings and then treated as such: 12345 - 5: Numbers are converted to strings. 123.45 - 6: Floats/decimals are converted to strings. true - 4: Bools are converted to strings.
--merge-input-documents	See merge input documents.
--format	See format.
--colour	Colourise output.
--color	Alias of --colour.
--escape-html	See escape html.

Example

Select the image within a kubernetes deployment manifest file:

$ dasel select -f deployment.yaml "spec.template.spec.containers.(name=auth).image"
"tomwright/auth:v1.0.0"

Piping data into the select:

$ cat deployment.yaml | dasel select -p yaml "spec.template.spec.containers.(name=auth).image"
"tomwright/auth:v1.0.0"